We report the recent progress in the development of high intensity ultrashort pulse lasers at the State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics (SIOM). Based on the concept of op

A scheme of combining smoothing by spectral dispersion (SSD) technology with lens array (LA) is introduced in laser produced shock wave experiments. The feasibility of the scheme is analyzed by numerical simulation. It is shown th

A novel method of error analysis for opto-mechanical system by considering issues of the space and time stability is proposed. According to the theory of error transfer model and the system stability requirements, the temporal par

Thermal effects control is very critical in highly scaling the output power of diode-pumped solid-state lasers to a few watts especially for end pumping configuration. Low temperature reservation of the pumping surface and the cry

We present a continuously tunable Alexandrite laser. By means of chromatic dispersion prisms, the output spectrum in the range of 725-781 nm has been obtained. The output energy at the center wavelength of 750 nm has achieved 1 J

The stability of the output of a heat capacity laser was measured. The output power dropped rapidly with the increase of lasting time. The result showed that the rise of the average temperature of laser medium was not the main rea

In order to improve the energy efficiency of high power laser system of ICF and use the optical energy sufficiently, converting Gaussian laser beam into uniform beam is important. Meanwhile, the wavefront of the laser beam in the

Multi-kilojoule petawatt lasers using chirped-pulse amplification need large-scale compression gratings. Tiled-grating approach has been adopted in several systems to meet the size requirements, grating tiles need to be precisely

We demonstrate an efficient tunable diode-end-pumped continuous wave (CW) Yb3+:Lu2SiO5 (Yb:LSO) laser. With a 5 at.-% Yb3+-doped sample, we obtained 3.24-W output at 1080 nm for 7.3 W of absorbed pump power, the corresponding slop

Luminescence of Nd3+ is observed in a new undeuterated organic liquid medium. The measured lifetime 'tau' of 1060-nm emission is 460 microseconds and the emission cross section is 2.54*10^(-20) cm2. According to the spectral resea

Ultra-thin slab with the dimension of 1*10*60 (mm) is demonstrated to acquire high-power laser output with high beam quality. The output average power of 70 W with diffraction limited beam quality is obtained, and the total optica

We demonstrated the measurements of attenuation constant of a multi-mode fiber with 300-micron core diameter and 1-km length at 1070 nm. The observed attenuation constant was below 0.7 dB/km, the laser power of 5 kW was coupled in

In order to get stable continuous wave (CW) mode-locked (ML) laser, conventionally, the laser cavity was designed to reach very small mode radius in the laser crystal to make the laser material saturated. While for the laser diode

A numerical model is presented to predict the time-resolved evolution of the spatial intensity distribution of the laser pulses in the super-Gaussian mirror resonator, taking into account diffraction and stored energy depletion. T

A new method is proposed which makes it possible to produce flattened irradiance distribution by incoherent combination of cosh Gaussian beams with different parameters. Based on the Collins integral formula, the resulting irradia

This paper introduces a self-tuning fuzzy temperature control system for the diode-pumped solid-state (DPSS) blue laser at 473 nm. This temperature control system includes circuit of temperature sampling, power circuit of temperat

In order to get high efficiency and high brightness laser output with single fiber coupled laser diode array, two laser diode array bars which have 40-W continuous wave (CW) output power at 980-nm wavelength are used in the experi

In the 9th laser system of Shenguang II inertial confinement fusion (ICF) facility, tunable Fabry-Perot (F-P) filter is applied to compensate the FM-AM effect. According to the technical requirements of compensation device, a prec

Structural design and stability analysis of 'phi' 570 mm mirror mount are performed. Under the constraint conditions, the geometric parameters of cross-flexure pivot in large aperture mirror mount are determined. With finite eleme

A laser diode (LD) stack pumped solid-state laser (DPL) with different cooling conditions was reported. The thermal lens was calculated and compared under different cooling conditions. The influence of the thermal lens effect on t

Propulsion system using continuous-wave (CW) CO2 laser has several advantages in comparison with other systems. This system does not require strong structure compared with propulsion with chemical propellant, plasma and gas arc je

We have developed a rigid hollow fiber composed of a silver-clad stainless steel pipe. The inside wall of the pipe was polished to a mirror-smooth state, and after that a cyclic olefin polymer (COP) as a transparent dielectric mat

Based on the laser rate equations in a typical four-level system, we research the temperature-dependent gain characteristics of a solid-state heat-capacity laser (SSHCL) involving the small-signal gain coefficient and the gain dis

The technology of measuring high-speed optical pulse sequence is under fast development for meeting the increasing requirement in optical communication, characterization of optical pulse and other fields. We propose a chirped puls

We have successfully demonstrated a single-frequency distributed-feedback Yb-doped silica fiber laser. The laser cavity is 10 cm long and is formed by a simple method called the shielded method. The phase shift in the fiber Bragg

A refractive index profile design, which can enable us to obtain a flat-top fundamental mode field around the center, is presented. The theoretical method to analyze the four-layer large flattened mode (LFM) fibers is given. The p

A high energy all-solid-state blue laser with wavelength of 455 nm is proposed, which can be used in laser communication underwater or in the differential absorption lidar (DIAL) system. Ti:sapphire crystal is suitable material an

With the advent of HDTV, the high density DVD (HD DVD) and blue-ray disk (BD) series will become the mainstream. Compared with BD, HD DVD has lower producing cost and sailing price, and it can be compatible with DVD. We design a n

The Q-switching performance in a folded resonator containing prism reflectors is analyzed. It is shown that the performance of the Q-switch in a folded cavity is affected by its configuration. A variety of configurations are compa

The energy storage of solar radiation with magnesium as an energy reservoir is proposed for renewable energy cycle. Magnesium reaction with water generating hydrogen and residual MgO is used to retrieve energy. Solar pumped laser

Development of a fiber laser pumped, compact mid-infrared (IR) difference frequency spectrometer employing a periodically poled LiNbO3 (PPLN) for next generation environmental monitoring is presented. Previous spectroscopic experi

A small flying object (kite plane) was successfully driven by using the laser energy transmission technology. A demonstration test was done in a large baseball dome stadium. A long-time flight of a kite plane flying at an altitude

A high peak power, high repetition rate master oscillator power amplifier (MOPA) system incorporating an Yb-doped fiber amplifier and its second harmonic generation (SHG) were investigated in detail. The oscillator is actively Q-s

A compact Q-switched laser based on Er/Yb co-doped fiber is demonstrated. Operating in repetition rate of 10-100 kHz and Q-switching window time of 100 ns to 2 microseconds, the laser is optimized in the amplitude and stability of

A new physical explanation of the fringes in the high-order harmonic spectra generated by ellipticity-modulated infrared pulses is proposed, which is different from those in previous works. In this work we find that the fringes ar

Nanohole fabrication using near electromagnetic field enhancement in vicinity of gold particles is demonstrated. Gold spherical particles with the diameters of 40, 80 and 200 nm are deposited on substrate surfaces and irradiated b

The property of femtosecond laser pulse propagation in a metallic nano-slit lens, which is composed of nano-slits with variant widths, is investigated by using the finite-difference time-domain method. By appropriately setting the

A simplified Coulomb explosion model is presented for the analysis of the explosion dynamics of hydrogen clusters driven by an ultrashort intense laser pulse. The scaling of the proton kinetic energy with cluster size has been stu

Experiments for the laser guiding have been carried out with the 30-fs, 100-TW Ti:sapphier laser pulse interaction with a long slab (1.2*10 (mm)) and discharged capillary of underdense plasma. Formation of an extremely long plasma

Laser-accelerated ion sources have exceptional properties and could stimulate development of compact ion accelerators. For many applications beam control is an essential requirement. A new and interesting technique to control prot

This paper reports fundamental aspects of high-order harmonic generation from N2, O2 and CO2 molecules spatially aligned with intense femtosecond laser pulses. The time-dependent harmonic signal observed with a pump and probe tech

The correlation between the gain material and the factors affecting characteristic temperature in high-power semiconductor lasers is comprehensively considered, and the AlInGaAs is adopted as the active area material. The AlInGaAs

The technique of pulsed anodic oxidation is adopted in the fabrication of 980-nm bottom-emitting vertical-cavity surface-emitting lasers. A high-quality native oxide current blocking layer is formed with this method. A significant

An optical fiber bundle array coupling module with high output power is proposed. The device integrates the coupling technique of the high power laser diode array (LDA) and the flat end-surfaces of fiber array. This module can eff

The design, fabrication, and characteristics calculation of 980-nm optically pumped semiconductor disk laser are reported. The laser combines a vertical cavity semiconductor laser with a partically reflecting out coupler and an ex

High power diode array module has been fabricated. The epitaxial structure is an InGaAs/GaAsP strain compensated single quantum well. The laser bars are made with a filling factor of 84.6%. The module's quasi-continuous wave (100

High power bottom-emitting In0.2Ga0.8As/GaAs 4*4 two-dimensional vertical-cavity surface-emitting laser (VCSEL) arrays, with high output power in the 980-nm wavelength regime are reported. At room temperature, the 16-element array

It is observed that the pulse duration of loosely focused pulses is self-compressed during the nonlinear propagation in argon when the input pulse peak power is close to the threshold power for self-focusing, and the results are c

We describe a Ti:sapphire multi-pass amplifier with high efficiency at the repetition rate of 1 kHz. In the amplifier, the incident pulse is 0.66 mJ with the pulse duration about 90 ps. The incident pulse is amplified to 7.2 mJ wh

We suggest and demonstrate an approach to generate a femtosecond multi-terawatt pulse train at repetition rate of 100 MHz in a 10-Hz chirped pulse amplification Ti:sapphire laser system. With an electro-optic Q-switch regenerative

Two-dimensional particle-in-cell simulations are taken to study the interaction of a relativistic, circularly polarized laser pulse with a preformed overdense plasma channel containing a slice of micron size. The laser pulse is co

We present the study of the interaction of an intense circularly polarized pulse with a solid target with one-dimensional (1D) particle-in-cell (PIC) simulation. The evolvement of ion motion with time is explained by a purely kine

Space debris distribute in a large range in the space, and their size are very different. For the purpose of detecting the small space debris, the space-based laser radar is used. The characteristics of the background radiation in

A reflecting ring focusing system for laser propulsion has been designed. A paraboloidal reflector of higher order is constructed to focus the laser energy on a ring which can produce a tire liked ignition region in the thruster.

We present a simple method of the spectral interference between two white light continuum spectra to measure the Gouy phase shift of the focused femtosecond laser pulses. From the spectral interference signal, the relative phase i

The Technical Integration Experiment Line (TIL) prototype for Shenguang (SG) III laser facility at Research Center of Laser Fusion (RCLF) of China Academy of Engineering Physics (CAEP) has commissioned the first beam line into the

Quantitative analysis of frequency tripling based on the transform of phase aberrations is presented to study the influence of medium-high phase errors on focal spot tails. Nine-fold increase of energy fraction of high-order spect

Electron acceleration by a propagating short ultra-intense laser pulse in a low-density plasma has been investigated. Electrons have the maximum energy when meeting the peak of the laser pulse. If a propagating laser pulse is abru

Pulse shaping and phase control of femtosecond pulses are shown to have effect on the dielectric breakdown of sapphire. The influence of a pulse tilt on a dielectric breakdown is demonstrated. Three-dimensional structuring of tran

We have performed a pump and probe experiment for real-time reflectivity measurements as a function of superimposed laser shots at the fluence below the ablation threshold to induce nanostructure formation on thin films of diamond

Near infrared to ultraviolet (UV) and visible upconversion luminescence was observed in ZnO single crystalline under femtosecond laser irradiation. The optical properties of the crystal reveal that the UV and visible emission band

The signal-to-noise ratio (SNR) of the optical heterodyne beat between a low-power laser and an optical frequency comb with a relatively low mode power is often insufficient to exclude the possibility of frequency counter error. W

We designed a novel and low switching-power all-optical fiber switch. The highly nonlinear photonic crystal fiber (PCF) and the bidirectionally pumped Er3+ doped fiber amplifier are inserted into the Sagnac loop mirror simultaneou

Densely-aligned void arrays of the length of hundreds of micrometers are fabricated in SrTiO3 crystal by tightly focusing multiple femtosecond (fs) pulses and fixing the focal point at a certain depth of SrTiO3 crystal without tra

We propose two dense gas schemes of four-level 'Lambda'-type and V-type atoms based on the effect of quantum coherence. It is shown that under certain conditions the dense gas can simultaneously exhibit negative permittivity and n

The analyses of second harmonic generation (SHG) effects have been firstly conducted for characterizing ultrashort pulse with the spectral phase interferometry for direct electrical reconstruction (SPIDER). The results show that w

The chirp effect in supercontinuum (SC) generation in photonic crystal fibers (PCFs) is researched carefully in experiment. Using an acoustic-optics programmable dispersive filter (AOPDF), the 1-4 order dispersions of the pulses f

The near-field scanning optical microscope, which is integrated with scanning probe microscope technology, has been investigated as a tool for material science, biology, photolithography, and high-density optical recording. In nea

In the last two decades we have studied and developed two types of laser speckle flowgraphy (LSFG) systems to visualize blood flow distribution in skin tissue, human retina, etc.. The system based on analyses of the laser scatteri

Gauge block measurement by using optical interferometry in Korea Research Institute of Standards and Science (KRISS) is described. A partially modified commercial Twyman-Green type gauge block interferometer equipped with three fr

The McCumber relation can be deduced without assuming that all active centers have the same structure of sublevels. The range of validity of the McCumber relation is the same as that of the effective emission...

Laser materials for eyesafe wavelength generation and Q-switching crystals for short pulse operation were studied. Er,Yb:phosphate glass as a laser crystal and Co2+:MgAl2O4 as a saturable absorber were found to be an effective pai

The problem of the intense femtosecond pulse with elliptical transverse distribution propagating in air is reduced to an analogous problem of a particle moving in a two-dimensional potential well using variational method. Differen

Light-emitting silicon nanocrystals are prepared by the pyrolysis of silane and subsequent controlled size-reduction by chemical etching. These nanocrystals show luminescence tunable through the full visible spectral region. The l

In this article, we present some new progress in the tiled-grating field which mainly includes the theoretical description of all the errors existing in the tiled-grating system and the experimental setup used to...

Single pulse laser-induced damage threshold (LIDT) was investigated for electron beam evaporated optical coatings, including ZrO2 and HfO2 single layers, ZrO2/SiO2 and HfO2/SiO2 high-reflective (HR) coatings, using a 50-fs, 800-nm

Lidar is an efficient tool for remote monitoring, but the effective range is often limited by signal-to-noise ratio (SNR). The reason is that noises or fluctuations always strongly affect the measured results. So the weak signal d

Estimating formula of the smallest power of illuminating laser of tracking, acquisition and pointing system in space is founded, and the smallest value that the illuminating laser sends when the receiving system can detect the ret

We propose two schemes of atom localization based on the interference of double-dark resonances in a tripod and a 'Lambda'-type four-level system. It is demonstrated that the localization is significantly improved owing to the int

The effect of thickness ratio of two materials on the residual stress was studied in HfO2/SiO2 multilayers deposited by electron beam evaporation on BK7 glass substrates. An optical interferometer was used to analyze the residual

A one-dimensional (1D) pressure sensor based on defect layer has been studied by means of transfer matrix method, and the factors influencing the photonic crystal (PC) pressure sensor are analyzed. The effect of different doping w

The experimental realization of partially coherent bottle beams is reported in this paper. It is shown that by controlling the coherence of the incident light we can generate the adjustable partially coherent bottle beams. The gen