Based on the geometrical probability factor of lidar system and the influence of the second mirror projection in the plane of the major mirror of telescope,using Monte Carlo integral method,improves the theoretical equation of geometrical form factor of the off-axis lidar.The optimization of geometrical form factor can be achieved by insert a lens at the focal plane of the telescope with a proper parameter,with the image effect of the lens,ensure the entrance pupil of the echo signal only related to the diameter of the telescope ,which is not affected with the area of the detector.Comparisons analysis between theoretical results and experimental results show that,the proposed method has obvious advantages which the relative error between the calculated value and experimental results reduces 30%.The simulated results prove this enhanced method is effective and simple.

Atmospheric aerosol has a strong characteristic of temporal and spatial variation.Aerosol scale height is an important physical parameter to reflect atmospheric aerosol vertical distribution,which is often measured by several instruments simultaneously.Based on the assumption of uniform parallel sphere of stratified atmosphere,a new method that aerosol scale height is obtained only by sun-photometer is studied,using stratified atmospheric algorithm.The research indicates that the parameters such as average extinction coefficient and the optical depth of stratified atmosphere,atmospheric aerosol vertical distribution height,and aerosol scale height can be gotten by the stratified atmospheric algorithm only using sun-photometer.Compared with conventional method,the relative error of aerosol scale height gained by stratified atmospheric algorithm is less than 10%.The relative error of atmospheric optical depth gained by stratified atmospheric algorithm and whole atmospheric algorithm is less than 2%.Therefore,using stratified atmospheric algorithm to obtain aerosol scale height only by sun-photometer is feasible,and it extends the sun-photometer′s application.

Based on the mathematical model of modulation transfer function in atmospheric turbulence,the combined effect of atmospheric coherence length and optical pupil diameter on integral resolution and spot radius were investigated.Approximate algebraic solutions of resolutions and spot radii are derived for long-term exposure and short-term exposure by use of interpolation method.The result shows that the resolution is mainly limited by the pupil diameter while the pupil diameter is smaller than atmospheric coherence length,and can be enhanced by increasing the value of the pupil diameter.However,the resolution will not be significantly improved with further increase of the pupil diameter,since the imaging performance is gradually limited by turbulence while the pupil diameter is larger than atmospheric coherence length.There are limiting values for the resolution and spot radius restricted by atmospheric coherence length while the ratio of the diameter to atmospheric coherence length tends to infinite.For short-term exposure,since the tilt effect due to large-scale eddies is eliminated,the integral resolution and the spot radius are better than that of long-term exposure.Especially,for the near field of short-term exposure,the maximum value of integral resolution is approximately increased by a factor of 3.5 and the minimum value of spot radius is approximately decreased by a factor of 1/2,as compared with the case of long-term exposure.

A calibration method based on a standard blackbody source for broadband terahertz detectors was proposed.The method includes a line-of-sight calibration setup,two calibration procedures and the corresponding simulation programs.The method takes into account the ambient temperature,the ambient humidity and the transmittance of the terahertz low-pass filter.A 4.2 K silicon bolometer was calibrated in the terahertz range by using the proposed method.The calibrated detector was further verified by using a Fourier-transform spectrometer to measure the blackbody emission spectrum.Three main sources of calibration error were identified and the corresponding solutions to reduce the error were proposed.The method can be applied for terahertz pyroelectric detectors,terahertz microbolometers and other types of broadband terahertz detectors in general.

MSM(Mental-Semiconductor-Mental)photodetector has been widely used for its low capacitance and high bandwidth.For example,it can be used for space communication,remote sense and so on.But the development of MSM devices is still hindered by the dark current.In this paper,the 100×100 μm2 InGaAs-MSM photodetector is successfully fabricated.The dark current density is reduced to 0.6 pA/μm2(5 V)by designing InAlGaAs/InGaAs short period superlattices and InAlAs Schottky barrier enhancement and this improves the SNR.Parameters of the device are characterized as follows:the 3dB bandwidth is 6.8 GHz,the rise time is 58.8 ps,the responsibility is 0.55 A/W at 1550 nm and the external quantum efficiency of the absorption region is 88%.Inhibition mechanisms of the short period superlattices and Schottky barrier enhancement are analyzed.

A scheme of Optical Pulse Compression Reflectometry(OPCR)system based on Nonlinear Frequency Modulation(NLFM)was proposed,which can overcome the shortcoming(high side lobes)of Linear Frequency Modulation(LFM)based OPCR.The optical signal was modulated by NLFM pulse signal in single sideband modulation.Rayleigh scattering and ending reflection signal detected by photodetector was matched filtering by use of the NLFM pulse signal so as to achieve the OPCR reflection trace.Theoretical analysis,numerical simulation and experimental study verify that the NLFM based OPCR system can reduce the magnitude of the side lobes.In the experiment,the measuring range reaches 5.4km although 2km coherence-length laser is used,the spatial resolution is 16.5cm,and the side-lobe suppression rather than LFM is 5.8dB.

A method to measure the relative phase distribution of the signal with repetitive pattern was proposed based on ultra-high resolution optical spectrum analysis.After achieved the optical spectrum,the pump with carrier suppression of the Mach-Zehnder modulator was modulated to create a dual-pumping stimulated Brillouin scattering,as dual-channel active filter.By continuously scanning through the wavelength range under test,data acquisition and processing,the relative phase distribution of modulated optical signal was got.The frequency response results show that the dual-channel filter is suitable for phase measuring,and the relative phase distribution in frequency domain of a 5 Gb/s,31 bits optical signal with repetitive pattern modulated using this technique was obtained.

Based on side-view imaging,the one-step method was proposed to achieve higher alignment efficiency in the location and alignment of polarization axes of polarization-maintaining fibers.In comparison with side-view imaging,one-step method is not necessary to rotate fibers in alignment process,for azimuth aligning can be realized by operating correlation between light-intensity profiles and the standard library of light-intensity profiles.In order to improve the alignment precision for the one-step method,the interpolation method and optimized observation method were putted forward.To test the reliability of these measures,light-intensity profiles of panda fibers of different observation surfaces were simulated by using ray-tracing method.Then the cross correlations were done among light-intensity profiles of the same observation surfaces.The sharp degree of correlation-curve peak was implemented for the estimation of alignment precision.The alignment precision among different observation position was analyzed with and without interpolation.According to the final result,with these two measures alignment precision is improved substantially and a theoretical precision better than 0.3° is achieved.

The impact of(1+1)×1 coupler pump arm numbers on the pump coupling efficiency was numerically studied.It is shown that pump coupling efficiency decreases with more pump arms built on the coupler,yet in a slightly decreasing manner.The coupling efficiencies of(1+1)×1 and(2+1)×1 couplers were studied and compared under the same tapered length and the same input mode field,it implies that large number of pump arms could have adverse impact on the total coupling efficiency.According to the simulation results,two side-pumped(1+1)×1 couplers were made and the two signal fibers were spliced to form a cascaded structure.A total output power of this cascaded-structured pump coupler was about 564 W,corresponding to a coupling efficiency as high as 93.6%.And,two side-pumped(2+1)×1 couplers were made respectively and the two signal fibers were spliced to form a cascaded structure.A total output power of this cascaded-structured pump coupler was about 1 120 W,corresponding to a coupling efficiency as high as 92.5%.The loss of (N+1)×1 cascaded structure coupler signal light were less than 0.4%.Achievied the kW class output power of pump light.

Monocentric multiscale computational imaging system was used to solve the problems of high complexity and cost in traditional wide-field high-resolution camera.Image processing was used to correct the plenty of aberrations caused by the simplified optical system,especially the spherical aberration and the lateral chromatic aberration.The aberration characters were analyzed to get the imaging data.The image was processed separately in red,green and blue channels using the system parameters and the aberration manifestation.Firstly,a non-linear image scaling method was used to harmonize the magnifications of different colors so that the lateral chromatic aberration is corrected.Then,the blurred image of different channels was divided to sub-frame sections because of the space-variant point spread function of the optical system.The sub-sections were restored by Lucy-Richardson algorithm so that the monochromatic aberrations is corrected.At last,the images in red,green and blue channels were fused to be the corrected image.The imaging and correction process was simulated and the image quality was assessed by mean squared error,peak signal to noise ratio and structural similarity.The results show that the aberration caused by the computational imaging system can been corrected effectively and the image quality can been improved.

An adaptive electronic image stabilization algorithm was proposed to remove jitter from videos with foreground moving object.Visual attention on motion was used to make fast foreground segmentation.It made difference between three adjacent frames based on blocks,and the temporal-spatial consistency was validated to label foreground moving object.The grid-sampling and significant degree sorting were proposed to detect global distinct features in the background area of reference and match in current frame.The distance criterion based on statistical distribution was used to delete mismatched points,which improved the speed and accuracy of global motion estimation without iteration process.Then Sage-Husa adaptive filtering method was described and improved,which corrected the process and observation noise by estimating their statistical property in real time.The low-frequency visual smooth as uniform motion was simulated.Thus,it can remove camera jitter and retain camera scanning simultaneously.With VC++ implementation and a computer(Intel Core(TM)2,2.33 GHz),processing image of size 320×240 reached 22 fps speed.The experimental results illustrate that the proposed algorithm can stabilize the inter-frame jitter with large or multi moving targets and track the real scene with smooth visuality.

In order to remove the haze in natural disaster remote sensing images,an approach based on dark channel and hazy image degradation model was presented,which could remove the haze by using guided filter.Firstly,images of natural disaster were divided into fog area and mist area by threshd,and different methods were used to obtain the dark channel of the images.Then,guided filter was used to optimize the transmmission map,and the contrast of the images was stretched to improve the dynamic range of the images.A series of natural disaster remote sensing images were chosen to test the alogrithm of haze removal.Finally,a series of evaluate parameters were proposed to assess the method.The result shows that the proposed algorithm can remove the haze of the images,improve the image quality,and enhance the color and detail of the images,so that the high-quality images can be obtained,which meet the requirements of haze removal for natural disaster remote sensing images to some extent.

A high-speed gated second generation image intensifier which is of short afterglow,high resolution and fast response time was designed.A high performance range-gated ICCD was obtained by coupling a fiber taper to CCD.The performance of each component and their effects on the system spatial resolution were analyzed.FPGA was employed to design the circuit control system which can achieve digital control for ICCD by producing a nanosecond gating width.The system can also obtain clear images of objectives in different brightness and distance by adjusting the pulse width and delay time.In addition,the background noise was reduced and the dynamic range of imaging was increased.The gain of this system can be monitored and adjusted to reach a signal-noise ratio of 20∶1 dB.A gating DC pulse with voltage of －200 V and width of 3 ns-DC continuously adjustable was applied to achieve image intensifier gating.In order to improve the supplement speed of electrons to the photocathode,a square grid which has 5 μm line width and 50 μm spacing lithography was equipped to the input window surface.This also ensured that the photocathode response speed is fast enough when the gating width is 3 ns.The highest gating frequency can reach to 300 kHz.The experimental test shows that the gain of the image intensifier is 10 718 cd/m2 lx when Microchannel Plate voltage is 700 V and phosphor screen voltage is 5 000 V,the system spatial resolution is 29.7 lp/mm.

In order to reduce the noise of reconstuted image when imaging high orbit satellites with intensity correlation array,research on array amelioration should be done to improve the quality of intensity correlation imaging.According to intensity correlation principle,the reasons of spatial spectrum measurement noise and phase retrieval noise generation were analyzed.Also,the effect of condenser area of intensity correlation array,detector arrangement spacing and other parameters on imaging quality was analyzed in condition that the number of high-frequency detectors was fixed.The selecting methods of optimal condenser area and the observation baseline was discussed by a mockup experiment.As the experiment results indicate:for the 14 Mv geostationary satellite,the optimal image can be obatined when the shortest array baseline length is 0.61 times as long as the transverse coherence length,and the condenser diameter is 0.46 times as long as the transverse coherence length.The intensity correlation imaging quality can be largely improved by array amelioration.

Based on a 2m aspheric segmented primary mirror of infrared telescope,wavefront aberration representation is derived through aspheric surface equation,the relation between wavefront aberration and interference bright fringe is established,the telescope model is created in ZEMAX,a MATLAB-based program is compiled in order to simulate and analyze the relation between stitching tolerances and aberrations in terms of fringe Zernike coefficients by this model.A linear retrieval method of stitching tolerances base on the tolerances sensitivity matrix is proposed,the retrieval algorithm of all segments stitching tolerances is established on this basis,and stitching tolerances of single sector-shaped segment are retrieved,the simulation results show that when stitching translation tolerance is less than 1mm or angular tolerance is less than 1°,the retrieval deviation is better than 3% and fast convergence,when the stitching translation tolerance is less than 0.1mm or angular tolerance is less than 0.1°,the retrieval deviation is better than 0.5%,and retrieval deviation continue to decrease to near zero.The algorithm is simple,efficacious,suited engineering application.

Plane wave expansion method has systematically studied the complete Photonic Band Gap(PBG)of copper-coin-shaped triangular lattice Photonic Crystal(PC).The results demonstrate that the copper-coin-shaped scatterers is a combination of the air hole type and dielectric rod type of PCs,which in favor of obtain a wider complete PBG width.The width of the complete PBG has certain stability to deviation of doped material and the air hole radius caused by the preparation process.The two types of dielectric of which the PC are composed must have sufficiently large dielectric constant ratio to get the complete bandgap.The copper-coin-shaped triangular lattice PC begins to appear complete bandgap when the ε=11.8.By grouping optimization of parameters,the widest complete PBG of Δωa /2πc is 0.136 1 with Δω/ωmid of 33.55% when ε is 22.75,R is 0.483 μm,d is 0.195 μm,φ is 90° and G is 1.3.

In order to achieve optical isolator,a system of one-dimensional magnetic photonic crystals with two metal films coated at its two sides was designed.The transmission properties of the structure through the modified transfer matrix method were studied.Due to the coupling of microcavity mode and the metal plasma,the structure shows one-way transmission feature and realizes the function of optical isolator.The performance of optical isolator is dependent on the incidence angle,thickness of the microcavity as well as the thickness of the metal.The isolator has good performance for an incidence angle of 45°,a microcavity thickness of 449 nm and a metal film thickness of 150 nm.The results are demonstrated through an electromagnetic field simulation based on the finite element solver.

By utilizing the opposite thermo-optic characteristics of silicon oxynitride and polymer materials,a hybrid integrated silicon oxynitride and polymer channel waveguide based variable optical attenuator with low power was proposed,which consisted of a polymer core and a silicon oxynitride cladding.A heater is deposited on the S-bend waveguide to form an active region so as to realize tunable optical power attenuation by utilizing thermo-optic effect.Theoretical results show that an optical attenuation of ~50 dB can be achieved with an applied electrical power of 3.6 mW.Experimental result shows an attenuation of 0~40 dB,correspondingly,a maximum temperature change of 70.4℃ ,and an insertion loss of 5.4 dB.

A method of humidity detection based on surface plasmon resonance was proposed.Kretschmann structure was applied to excite surface plasmon polarization.Porous ceramic SiO2 was used as the humidity-sensitive material.The refractive index of porous ceramic SiO2 altered as the ambient relative humidity changed,thus leading to a shift of surface plasmon resonance angle.On this basis,the reflection spectrum was simulated and analyzed under different refractive index of humidity-sensing layer by finite element method.Furthermore,the thickness of gold film was optimized in accordance with the full width at half maximum of reflection spectrum and the formant depth.The results show that,the best thickness of gold film is 55 nm,a linear relationship between the shift of surface plasmon resonance angle and the variation of humidity-sensing layer refractive index is got,high resolution of 0.37%RΗ and high sensitivity of 0.03°/% RH are obtained.The research contributes to the realization and application of humidity sensor based on surface plasmon resonance.

A hybrid plasmonic microcavity consisting of a silicon microdisk which is separated from a silver toroidal strip by a low-permittivity dielectric is proposed to achieve high quality factor as well as small mode volume.Mode properties such as quality factor,effective mode volume and energy ratio have been investigated by employing a finite element method and analyzed considering the different structure geometry.Simulation results reveal that this kind of hybrid microcavity maintains low propagation loss with high quality factor ~ 7000,high field limits with small mode volume 0.315 μm3,high energy ratio and can realize a refractive index sensor with high sensitivity.

The evolutions of system fidelity,atomic fidelity and cavity fidelity in the system of atoms interacting with coupled cavities were investigated considering two coupled cavities each containing one two-level atom and the atom interacts resonantly with cavity field.The temporal evolutions of system fidelity,atomic fidelity and cavity field fidelity were calculated and the influence of cavity-cavity coupling coefficient on the fidelity was discussed.The results show that when cavity-cavity coupling coefficient is small,the system fidelity and atomic fidelity all display irregular oscillations.When cavity-cavity coupling coefficient is greater than a certain value,they all display quasi-periodic oscillations.The fidelity of cavity field displays periodic oscillation,and its oscillation frequency increases with increase of cavity-cavity coupling coefficient.On the other hand,atomic fidelity is weakened,and the fidelity of cavity field is strengthened with increase of cavity-cavity coupling coefficient.

Dynamically controlled photonic band gaps was achieved via the electromagnetically induced transparency in the 1D optical lattices filled with cold atoms driven into a four-level N configuration.In this system,the trapped atoms have a Gaussian density distribution in each optical lattice,which make the refraction of the media is periodically modulated in space,then the probe field propagates as in Photonic crystal.The numerical calculations show that:the two windows based on double dark states arise and when the Bragg condition is fulfilled the densities of photonic states reduce and well developed photonic band gaps can be opened up.In addition,the induced photonic band gaps structure,the widths and positions,can be controlled via tuning the intensities and detunings of the two coupled fields.

An optical quantum random number generator based on parity of the number of photons detected in the equal time intervals was proposed.Light emitted from a continuous wave laser diode is attenuated into discrete single-photon sequence.The single photon is detected by a single-photon avalanche photodiode module.Random bit is extracted by measuring the parity of number of photons detected in equal time interval.The random bit extraction circuit based on field programmable gate array was developed.The influences of the size of time interval and the performance parameters of single photon module on performance of the designed random number generator were analyzed.In order to achieve a random bit generator with small deviation and fast generation rate,a method of setting time interval automatically according to average counting rate was proposed.A random bit generation rate of 2 Mbit/s was obtained when the designed random number generator works on a counting rate of 20 Mcps and the equal time interval is set as 0.5 μs.The random bit sequences were tested by random number test program ENT and STS.The test results show that the generated random bit sequences fully meet the standards of true random numbers,and do not require post-processin

Coherent control of the Electromagnetically Induced Transparency(EIT)was studied in inversed Y-type-four level system.Using the perturbation theory,the first-order perturbation solution of the system was derived,and the formula for width of the EIT window was obtained.Under the condition of the weak probing field,the effects of the controlling field intensity,coupling field intensity and the detunings on the EIT window were analyzed.It is found that the width of the EIT window broadens when the intensity of the control field increases,and narrows when the intensity of the coupling field increases.The EIT window width and the absorption for the probing field out the EIT window increase when the probing field and the coupling field are off the two-photon resonance.Under the condition of the weakly probing field and weakly control field,in the coherent superposition state,the effects of the original relative phases,relative intensities and relative phase between the probing field and control field on the absorption properties and EIT window width were analyzed.The results show that the effect of the relative phases between the probability amplitudes in the coherent superposition state on the absorption of the atom system is reverse to that the effect of the relative phases between the probing field and control field.The numerical results are elucidated by the dressed state theory and quantum coherence theory.

Mathematical model to calculate the Bidirectional Reflectance Distribution Function(BRDF)of laser scattering from rough surface was established based on small slope approximation.The model was used to calculate BRDF of alloy aluminum with given roughness.Theoretical data and experimental data were found in good agreement,which verifies the correctness of the model.Further study of the effects of roughness and sample optical parameters on bidirectional reflectance distribution function was carried out.Results show that the BRDF of laser scattering is related to root mean square height,correlation length of rough surface and optical parameters of the sample.As the incident wavelength is fixed,the diffuse reflectance of incident laser is stronger when the RMS height is greater,or when the correlation length is smaller,and the value of BRDF is more dispersed with smaller peak.As the surface roughness is fixed,the optical parameters of the sample have great influence on the value of BRDF.The peak value of BRDF is smaller while the imaginary part of refractive index is larger.With the increment of roughness,the effects of optical parameters on BRDF decrease gradually.

Aiming at the problems of spectral overlap peaks, wavelet transforms was used,by setting the low-frequency wavelet coefficients to zero and thresholding the high-frequency coefficients,baseline-drift correction and spectral denoising were completed simultaneously.The ridge lines posed by modulus maxima of wavelet coefficients were searched by multi-scale wavelet transforms,and the composite ridge lines were correctted.The peak position was corresponding to the position of the maximum scale parameter in the wavelet ridge lines.According to the obtained peak values,the least squares rule was used to find out the best-fit spectra which was superimposed by multiple unimodal Gaussian functions,thus,the intensity and width information can be carried out.Finally,method was applied to resolve overlapping spectrum containing composite baseline-drift and random noise,the results showed that the algorithm can separate these overlapping peaks very well,the deviation of peak position calculated by multi-scale wavelet transforms was within±1.3,and the deviation of peak intensity fitted by Gaussian functions was no more than 8.5%.Comparing with the peak information obtained by existing mature algorithm,to some extent,the proposed spectral overlap resolving algorithm is superior.

A series of insulating oil samples with different trace moisture contents were made up,and infrared spectrum scans were conducted on these samples to get the absorbance values of the water molecules at different characteristic wave numbers(namely 1 640 cm－1,3 400 cm－1,3 450 cm－1 and 3 615 cm－1).The uniformity coefficient of moisture in oil samples was defined,on the basis of which a calculation model for the kinematic viscosity of hydrous insulating oil was built up.The kinematic viscosity values of these oil samples under 40℃ were measured through experiments,which were compared with the calculated values based on the calculation model.The results showed that the calculation model can effectually reflect the influence rules of trace moisture on the kinematic viscosity of oil,and the correlation coefficient between the calculated values and the measured values was 0.9449,with an error range from －4.458×10－4 to 5.175×10－4.

Temperature and current tuning characteristics of distributed feedback laser and absorption lines distribution of HF gas in near infrared was investigated,generalized Lorentz functions was used to realize rapid approximate calculation of Voigt function.The Voigt profile fitting of absorbance and the inversion of gas concentration for wavelength scanning technology.A tunable diode laser absorption spectroscopy system for HF gas concentration measurement was designed,using one absorption line of HF gas near 1.28 μm as the target absorption line,using known standard concentration HF gas for preparation of different concentration HF gas to measurement.The detection limit is 1.12 ppm-m.The system has high measurement accuracy and long-term operate stability,satisfies the needs of HF gas real-time online monitoring.

Edible oil analysis based on three dimensional fluorescence specscopy was introduced.The 3D fluorescence spectra of variety kinds edible oils was obtained by using Hitachi F7000,the peak value of thresholds of those experimental spectra was increased and analyzed.The results show that there are obvious characterizes between the variety kinds edible oils,so the fluorescence fingerprint technique can be used to distinguish various edible oils.There are also obvious differences between the edible oils with the fried edible oils at the central wavelength and the peak intensity of three dimensional fluorescence spectra.These fried edible oils were heated in high temperature for different minutes,whereas there is no significant distinction between their transmission spectrum.Therefore,the experiments prove that the three dimensional fluorescence spectroscopy is a practical quick analysis method for the edible oils both in kinds and in qualities.

Tracking the process which erythrocyte endocytoses gold core-silver shell nanoparticles wrapped in crystal violet with laser optical tweezers raman technique was studied.The erythrocytes were imprisoned by optical tweezers every 20 s, the raman spectra of erythrocytes and the adjacent solutions were collected.Results show that the collected spectra of erythrocytes include the characteristic peaks of erythrocyte and crystal violet.The intensity of peaks belonging to erythrocyte of 1 001,1 128,1 213 cm－1 and which belonging to crystal violet of 915,1 177,1 370,1 586,1 619 cm－1increase over time,which show that in the process of co-culture with erythrocytes and nanoparticles,nanoparticles could increase the signal of erythrocyte and be accumulated in erythrocytes.By analyzing the difference of spectra value between erythrocytes and its adjacent solutions,it finds that spectral characteristic peaks belonging to crystal violet of 913,1 179,1 586 cm－1 changing like cosine with time,which suggested that the nanoparticles in erythrocyte induced after first increased,and then increased again.The time range where nanoparticles began to enter erythrocyte,the entering speed and the rate of lysosome degrading nanoparticles wrapped in crystal were caculated.This study shows that surface-enhanced raman spectroscopy can provide a new idea and an experimental method for the study of foreign objects into to cells.

In order to solve the lens pollution problem caused by Pt release layer in the preparing process of high quality thin mirrors with hot slumping glass technology,the effect of Cr layer thickness on surface roughness of thermal formed glass substrates by using "direct" slumping method was studied.The Schott D263T glass sheets with thickness of 0.3 mm were used as raw materials of ultra thin mirror substrates,and Pt,Pt/Cr layer were selected as release medium between the mould and D263 glass foils.Fixed coating thickness of the Pt layer was 50 nm,and thicknesses of Cr interlayer were 5 nm,3.5 nm,2.5 nm,1.5 nm,respectively.The results show that,after thermal forming treatment,when the thickness of Cr layer is 1.5nm,release layer does not peel off from the mould and the roughness of glass sheet is about 0.5 nm,which is close to the initial testing value of raw D263 glass and could meet the surface roughness requirement of substrates used for hard X-ray telescope.