激光表面纹理化过程中的Rayleigh-Taylor不稳定性

用表面纹理化的热模型 ,分析了固体表面的熔化和重固化的物理过程 ,计算了在纹理化过程中的表面温度、穿透深度、熔化深度、相面移动速度等物理量 ,提出了 Rayleigh-Taylor不稳定性形成周期化结构的机理。     

准分子激光等离子体开关控制脉宽研究

 利用准分子激光等离子体技术，在紫外预电离XeCl准分子激光器上获得了最短1.58 ns的短脉冲激光输出。实验中分析了聚焦到薄膜表面的光束能量密度对所产生的等离子体密度的影响，并对不同等离子体密度及维持时间情况下脉冲压缩效果进行了讨论，给出了激光器谐振腔在稳定腔及非稳腔两种工作方式下的实验结果。激光器在稳定腔工作时，脉宽可压缩至2.87 ns；采用非稳腔结构时，在脉冲能量不变情况下减小聚焦光斑面积，提高入射到薄膜表面的能量密度，得到了最短1.58 ns的短脉冲激光输出。该技术适用于任何其它准分子器件。     

10瓦级双包层光纤激光器

考虑到所用大功率激光二极管的光谱特性，对光纤激光器的基本法布里-珀罗腔型稍加改变，研制出激光二极管抽运的10w级双包层光纤激光器，获得最高功率为11．8w、波长1100mm的单模激光输出。     

PPLT倍频宽线宽掺镱双包层光纤放大激光

分别通过理论和实验研究了周期性极化的钽酸锂（PPLT）倍频宽线宽准连续掺镱双包层光纤放大激光.PPLT样品长为40 mm，极化周期为7.67 μm.基频光的中心波长为1064 nm，线宽约为6 nm.从基频光的光谱特性出发，利用超晶格倍频理论，解释了实验中获得的倍频温度与二次谐波功率之间的关系.在基频光的功率为2.2 W时，获得的宽线宽光纤激光倍频效率为1.8%.     

Sub-nanosecond strong pulse generated by backward Raman scattering

Hundreds picosecond strong short-wavelength pulses have been generate by a backward Raman oscillator amplifier pumped with a 10-J KrF laser from Heaven-1 MOPA system. Not only high power but also high energy laser pulses have been obtained with an energy conversion efficiency up to 17%. 640-picosecond pulse duration was observed in our experiments by a 1.5-GHz-bandwidth oscilloscope corresponding to 34 times of pulse compression rate.     

308nmXeCl准分子激光双侧面对称泵浦之形腔染料激光器研究

描述了用３０８ｎｍＸｅＣｌ准分子激光双侧面对称泵浦之形腔染料激光器，重点探讨了这种激光器的输出光束质量改善问题，实验发现这种双侧面对称泵浦较传统的横向泵浦，光束质量有较好的改善，对于２×１０－３ｍｏｌ／ｌ浓度的ｃｏｕｍａｒｉｎ４６０染料甲醇溶液，在波长４６０ｎｍ处，实验得到１１．７％的能量转换效率     

改善高功率激光二极管阵列光束质量的一种新方法

根据波导模理论，推导了高功率激光二极管阵列的远场分布，根据其分布特点，设计了一种离轴外腔.运用这种外腔，在工作电流为17A时，光束的束宽积从自由运转时的1100mm·mrad减小到128mm·mrad，二极管阵列的光束质量提高了8.5倍左右，输出功率约为自由运转时的75%.     

113-W in-phase mode output from two ytterbium-doped large-core double-cladding fiber lasers

Phase locking for two ytterbium-doped large-core fiber lasers has been demonstrated by using a self- imaging confocal resonator with a spatial filter.Steady high-contrast interference stripes are observed. The visibilities of coherent and incoherent stripes are 59% and 6%,respectively.The measured width of the central strip is in good agreement with the calculated result.For in-phase mode,the output power of the phase-locked fiber laser array is up to 113 W and corresponding slope efficiency is 38.5%.     

Continuous-wave and Q-switched performance of an Yb:YAG/YAG composite thin disk ceramic laser pumped with 970-nm laser diode

Using front face-pumped compact active mirror laser （CAMIL） structure, we have demonstrated an Yb：YAG/YAG composite ceramic disk laser with pumping wavelength at 970 nm. The laser has been operated in both continuous-wave （CW） and Q-switching modes. Under CW operation, laser output power of 1.05 W with 2% transmission output coupler was achieved at the wavelength of 1031 nm. Q- switched laser output was gotten by using an acousto-optic Q-switch. The repetition rate ranged from 1 to 30 kHz and the pulse width varied from 166 to 700 ns.     

Effects of prism beam expander and slits on excimer laser linewidth narrowing module

Theoretical simulation and experiments based on a prism beam expander and an echelle grating are conducted to study the dependence of linewidth and pulse energy on incidence angle and slit width. With a larger prism incident angle or narrower slit width, the linewidth becomes narrower while the laser pulse energy becomes lower. However, the pulse energy can be improved by optimally designing the prism beam expander. In addition, a subpicometer linewidth ArF laser is obtained with a double-prism beam expander and an echelle grating.