Tm-Doped Fibre Laser Pumped Cr^2＋：ZnSe Poly-Crystal Laser

Demonstrations of cw lasing in Cr^2＋：ZnSe poly-crystal are reported. The laser consists of a 1.7-mm-thick Cr^2＋ ：ZnSe poly-crystal disc pumped by a Tin-silica double-clad fibre laser at 2050nm. Using a concave high- reflection mirror with a radius of curvature of 500mm as the rear mirror, the laser delivers up to 1030mW of radiation around 2.367μm.     

Edge-pumped passively Q-switched thin Nd:YAG slab lasers

We report a high-power thin Nd：YAG slab laser with slab dimension of 1 × 10 ×60 （mm） partially edgepumped by diode laser arrays. Passive Q-switching is achieved with a Cr^4＋ ：YAG microchip adopted as the saturable absorber mirror. The pulse duration is around 10 ns while the pulse repetition rate is higher than 10 kHz. The average output power of 70 W is obtained with a slope efficiency of 36%. The diffraction limited beam quality in the thickness direction is obtained by controlling the pump beam diameter inside the slab. The laser head is very compact with size of only 60 × 74×150 （mm）.     

High-power diode-end-pumped Tm：YAP and Tm：YLF slab lasers

Diode-end-pumped continuous-wave(CW) Tm:YAP and Tm:YLF slab lasers are demonstrated. The a-cut Tm:YAP and Tm:YLF slabs with doping concentrations of 4 at.-% and 3.5 at.-%,respectively,are pumped by fast-axis collimated laser diodes at room temperature. The maximum CW output powers of 72 and 50.2 W are obtained from Tm:YAP and Tm:YLF,respectively,while the pump power is 220 W,corresponding to the slope efficiencies of 37.9% and 26.6%,respectively.     

End-Pumped Tm:YAG Ceramic Slab Lasers

Lasers from a Tm：YAG slab is end-pumped by continuous-wave output of the Tm：YAG ceramic ceramic am~e reported for the t~rst time to our best knowledge. The Tm：YAG ceramic a laser diode with central wavelength 792nm. At room temperature, the maximum power is 4.5 W, and the sloping efficiency is obtained to be 20.5%. The laser spectrum is centered at 2015nm.     

Nd-glass belt lasers with improved beam quality

Thermal aberrations, thermal induced birefringence, anddamage of laser medium are well-known limitations forhigh power diode-pumped solid-state lasers. Severalnew types of lasers have been designed to solve theseproblems in the past years. Double-clad fiber laser withlarge ratio of surface to volume presents excellent coolingproperties[1]. Good beam quality is achieved by usingsingle-mode cores in the double-clad fibers. For a multi-mode core fiber laser, good beam quality can be obtainedby us…     

Definition and measurement of the beam propagation factor M~2 for chromatic laser beams

The concept of the beam propagation factor M2 is extended for chromatic laser beams. The definition of the beam propagation factor can be generalized with the weighted effective wavelength. Using the new definition of factor M2, the propagation of chromatic beams can be analyzed by the beam propagation factor M2 as same as that of monochromatic beams. A simple method to measure the chromatic beam factor M2 is demonstrated. The chromatic factor M2 is found invariable while the laser beam propagates through the dispersion-free ABCD system.     

受激拉曼散射中的二阶量子关联

利用全量子理论和多模受激拉曼散射模型，研究了拉曼放大中，考虑泵浦光耗散时，斯托克斯光和泵浦光二阶量子关联函数随相互作用距离变化的特性，在不计及色散的影响时，斯托克斯光和泵浦光的二阶量子关联函数的变化主要取决于输入斯托克斯光和泵浦光的光强比，在极限情况下，本文的计算结果与拉曼产生的计算结果和经典耦合波理论的计算结果相符合。     

用于空间通信的小型化高功率低噪声光纤放大器

针对空间应用设计了结构紧凑、高功率、低功耗的光纤放大器.在电学设计上,以数字信号处理芯片为核心处理器设计了泵浦源驱动控制系统,形成了输出-检测-再输出的闭环控制逻辑,通过自动功率控制保证输出稳定性,同时降低泵浦源功耗,提升电光效率.在机械设计上采用光电分离模块化设计,不仅有利于散热和保持紧凑的结构,而且实现光学部分与电...     

分数自成像平面波导的光束组束

研究了激光束在分数自成像平面波导中的传输特性,提出了利用分数自成像平面波导进行光束组束的技术方案,讨论了激光束之间相位失配对光束组束的影响,并对两个输出平均功率为300W的板条激光器的光束组束进行了数值实验模拟.结果表明,分数自成像平面波导的光束组束可以有效地改善多个激光器组束后的光束质量因子M²,从而提高激光输出的亮度;而且这种组束方法对激光束之间相位失配的敏感度明显降低. 关键词： 分数自成像 平面波导 组束 光束质量     

硬边非稳腔平面波导激光器的光束特性

基于衍射理论和坐标变换,采用数值模拟的方法分析了硬边非稳腔平面波导激光器的光束特性,研究了存在非均匀抽运和增益饱和时,输出激光的光束质量.在端面抽运和边缘抽运时,比较了正支和负支非稳腔的输出光束特性.结果表明:利用优化的离轴硬边非稳腔可以得到近衍射极限的输出.在相同的抽运不均匀性情况下,对于边缘抽运和端面抽运,正支非稳腔的光束质量因子M2分别为3.9和2.3,而相同条件下负支非稳腔的M2因子为1.8和1.7.