With soft-core potential model and single electron approximation, the dependence of attosecond pulses on the chirp of the excitation pulse is theoretically investigated by solving 1D time-dependent Schr’dinger equation. The intens

A large-mode-area Yb 3+ -doped double clad fiber laser operating in CW pump and pulsed pump regime, respectively, is described. With CW pump, a 4.6 W quasi-continuous output operating in the 1.09 μm is obtained, when the pump powe

In the 940 nm LD pumped Yb∶YAG laser, the stable mode-locked trains wavelength at 1030 nm and 1050 nm is obtained by use of two pieces SESAM.The spectrum FWHM are 1nm and 2 nm. The repetition rates are 190.24 MHz and 178.6 MHz. Th

A way is studied to obtain output laser from ring laser with total reflection prisms by prism coupler. The expressions of the reflection coefficient and the transmission coefficient of the prism coupler constructed by cuniform cle

A cladding pumped Er/Yb co-doped double clad fiber ring laser operating in L-band is demonstrated. A 9-m-long Er 3+ /Yb 3+ co-doped fiber (EYDF) is used as the gain medium, and six diode lasers are used to cladding pump EYDF, by u

Long-period fiber gratings (LPFG) are fabricated by using CW CO_2 laser pulses, and transmission spectra are measured at different grating lengths. The coupling strength shows periodical variation versus the grating lengths.This

The design of a SiO2 film-loaded Ti: LiNbO3 integrated acousto-optic tunable filter is reported. The configuration, in which an angular offset between the acoustic and optical waveguides is introduced, offers a good performance of

Utilization of geometric optical characters of geodesic lenses, the equivalent light trail and phase transfer function are given. Simultaneously the distributing model is obtained. The focal spot intensity distribution of theory c

The single mode condition for a rib waveguide based on silicon-on-insulator (SOI) is determined through the eigen mode analysis using a finite difference method. This single mode condition gives the relation between the normalized

To understanding the energy transfer from carotenoids molecular to reaction centre in PSII, PSII particle complex purified from spinach was investigated with ultrafast fluorescence spectroscopy in the case of selective excited car

Based on the diffusion theory,a computational model is developed to deal with the problem of light transporting in biological tissues irradiated by arbitrary light source.According to the numerical calculation,the influence of con

The strain G-Q7 producing PHB was irradiated respectively by UV, He-Ne laser and both of them to increase PHB production. The results indicated that the coordinative effect of UV and He-Ne laser was better than using them individu

The FBG being used as the basic sensor unit, a hydrophone sensor has been designed and manufactured. Its principle and relevant experimental result are introduced. By using the matched fiber grating demodulation technique, dynamic

The effect of pumping light linewidth on fiber Raman amplifier used in density wavelength division multiplexed (DWDM) system is analyzed by applying SRS coupling wave theory.It is pointed out that the pumping efficiency will be re

The mathematical model of coherent detection for inter-satellite tracking is rebuilt under Gaussian approximation. The intermediate frequency current from a detector as a function of a beam mismatched angle is calculated under thi

A novel BOADM structure based on fiber gratings and circulators and two experimental structures are proposed. The experimental result shows that the heterohyne crosstalk and homodyne crosstalk of BOADM are -21.4 dB and -32 dB at t

Dispersion-managed soliton interaction is investigated in an optical time-division multiplexed system with random dispersion map by the variational approach and the numerical simulation. It is found that the perturbation caused by

The method is proposed to improve the response range of DOP Ellipsoid to PMD. A conclusion is given that response range of DOP ellipsoid shortest axes to PMD can be greatly increased by using the proper bandwidth filter and select

Tooling factor is one of the most important parameters in optical thin film coating process. Calculation indicates that, while coating three half-wave filter, it is possible to roughly get this factor from the passband center posi

The influence of the reflectance phase shift of the reflector on the peak wavelength in a liquid crystal Febry-Perot etalon (LCFPE) filter is discussed. In the tunable LCFPE filter, the peak wavelength is selected by adjusting the

A design of micromachining based direct-coupled variable optical attenuator (VOA) is presented. The device operates by misaligning a fiber-to-fiber coupling through a lateral displacement of one of the fibers mounted on a micro-ma

In order to measure plasma X-ray produced by laser fusion in the 0.2~0.37 nm range, a focusing bent crystal spectrometer has been designed for measuring the spatial and temporal resolutions. The LiF crystal with a 2d spacing of 0.

To detect and control the nanometer distance between the sample and the fiber tip is part of the key technology of NSOM system. Here a pizeo sensor with DDS is discussed. One of the sensor′s electrodes is separated into two like p

The basic theory of dispersion compensation of the thin film is discussed. The optimized multiplayer mirrors used for a femtosecond mode-locked Ti∶Sapphire laser is reported. The mirrors exhibit high reflectivity (>99.5%) over a w

The carbon films exhibit a variety of useful properties such as a hardness approaching that of a diamond, transparency,a smooth surface morphology,wear resistance and chemical inertness,and were widely applied in the fields of mec

The measurement of deformation in microregion or on a microcomponent always faces two problems. One is the rigid displacement caused by the unitary motion of the specimen, and the other the rather small deformation in the microreg

Thin SiO_2 films have been deposited by electron beam evapouration method.The influences of oxygen partial pressure on the mechanical,surface morphology and optical properties were studied.The results show that the residual stres

MEH-PPV film is a kind of conjugated polymers synthesized by modified Gilch route. The reflection spectrum of MEH-PPV film was measured by the UV-365 spectrophotometer, which is not exact result of the film because of the reflecti

Principle of nonlinear correction for radiographic image by optic density vs. path length curve was introduced. By the principle of radiography, the function of the optic density and the path length was monotonous on conditional t

With the advantage of Neural Network & error control, presented the PID servocontroller model basing on BP Neural Network.The principle was applied to turntable for dynamic-simulation-scan-imaging experiment. The technique avoided

TiO_2/SiO~~2 multiple layers anti-refledtion (AR) coatings for the facets of 1.55 μm polarization insensitive semiconductor optical amplifiers were designed and fabricated. Less than 5×10 -4 reflectivities were obtained for both

It is only the relative phase distribution between the tested object and reference plane that is attained after phase demodulation and phase unwrapping in profilometry. However, the objective of 3D shape measurement is to obtain t

OTF of under test lens was tested with pinhole image processing and analyzing, the influences of sampling frequency on test precision were analyzed, and a calibration method of frequency conversion scale and sampling frequency on

Electroluminescences of ZnO nano-particles are observed under volts d.c. The contrast of EL spectra from some powders that dealt with different surfactant had been studied. The EL intensity of the ZnO powders can be enhanced in th

Er~(3+)/Yb~(3+) co-doped 70TeO_2-5Li~~2O-(25-x)B~~2O~~3-xGeO~~2(x=0,5,10,15,20 mol%) glasses were prepared. The thermal stability of glasses were studied. The absorption spectra,emission spectra and fluorescence lifetime of the 4

In∶Nd∶LiNbO_3 crystals were grown by Czochralski method with In~~2O~~3 and Nd~~2O~~3 as dopants.The optical damage resistance ability of In∶Nd∶LiNbO~~3 crystal was investigated by light spot distortion method and the photorefract

The absolute band gap is improved by reducing the symmetry of the photonic crystal, two structures of the rectangle lattice 2D photonic crystal with rectangle dielectric rods is put forward. The modified plane-wave expansion metho

The holographic grating formation induced by an input pattern in company with a reference wave in a fullerene-doped nematic liquid crystal film were studied experimentally. In experiment we employed a particular method in order to

The thermal entanglement produced by resonant Jaynes-Cummings model with and without the effect of virtual-photon field is investigated.It is shown that there exists a critical temperature,above which thermal entanglement of atom

To provide the dynamics of cavity polariton in semiconductor microcavity containing GaAs quantum-well, the dispersions of the three cavity polaritons have been given by the model of three coupled oscillators, meanwhile the linewid

In order to study the interference stability in phase coded quantum key distribution (QKD) system, the influence that optical fiber birefringence, temperature variation, asymmetry and coupling ratio have on the interference visibi