大功率线阵激光二极管侧面抽运Nd：YAG激光器特性研究

对激光二极管（LD）抽运固体激光器中大功率线阵激光二极管三向对称侧面抽运的漫反射腔结构进行了研究。激光器使用Nd：YAG作为激光晶体，电光器件材料为KD^＊P晶体，漫反射体为陶瓷材料。实验表明，抽运光的利用率和均匀性有较大提高。在重复频率为10Hz下，实现了脉冲宽度8ns，最大平均功率为近2W的1064nm红外激光输出，激光器的效率有显著提高。

大功率准连续Nd：YAG陶瓷激光器研究

采用侧面环绕均匀排布的紧凑型抽运结构，实现了激光二极管阵列侧向抽运Nd：YAG陶瓷激光器高效率激光输出。理论计算得到谐振腔输出镜的最佳输出耦合透射率为22．2％，并在输出耦合镜透射率为22％的条件下，用掺杂原子数分数为1％，尺寸为拓φ5mm×75mm的Nd：YAG陶瓷棒，获得了平均功率大于230W的准连续1064nm激光输出，其光光效率和斜率效率分别高达52．4％和61％。并测得输出激光脉冲宽度为160μs，光谱线宽略小于0．8nm，光束发散角为16mrad。实验结果显示，Nd：YAG陶瓷激光器输出功率N

输出5W的电光调Q Nd：YAG陶瓷激光器

研究了激光二极管（LD）侧向抽运的Nd：YAG陶瓷电光调Q激光器的激光输出特性。该激光器采用九组激光二极管线阵列（LDA）侧面紧密环绕均匀排布的抽运结构，并用微通道热汇冷却技术冷却。在电光调Q方式下，重复频率为100Hz，抽运单脉冲能量为416mJ时，用尺寸为庐5mm×75mm，掺杂原子数分数为1％的Nd：YAG陶瓷棒，获得50mJ的1064nm激光输出，脉冲宽度为12ns，斜率效率达24％。并实验测量和分析了偏振片，KD^＊P晶体，四分之一波片等调Q器件的插入损耗。测量了输出激光时间波形和光斑的光强空间

双侧面90°抽运微通道致冷Yb：YAG板条激光器

报道了采用带有微柱镜的激光二极管阵列（LDA）双侧面90°排布抽运的Yb：YAG板条激光器，实验中使用的激光晶体尺寸为6mm×10mm×1mm，掺杂原子数分数为3％。抽运光通过自行设计的聚光系统聚焦成10mm×1mm的光斑进行抽运，聚光系统的效率为75％，晶体表面功率密度达到1．9kW／cm^2，晶体内抽运光交叠区的体功率密度达到38kW／cm^3，远高于阈值的1．7kW／cm^3。当激光器采用平一凹腔结构，耦合输出为6％时激光单脉冲输出能量最高为25．5mJ，斜率效率为13％。插入声光调Q晶体后获得4．

钛宝石激光器端面抽运Nd：YAG陶瓷激光器热沉积理论和实验研究

通过热沉积系数研究在激光提取条件下掺杂原子分数为1.0%的Nd：YAG陶瓷激光器中热沉积问题.热沉积系数定义为热沉积功率与激光器输出功率之比.在理论分析基础上,通过测量激光器斜率效率来间接测定热沉积系数,实验测定的热沉积系数值为0.63.建立激光提取条件下Nd：YAG陶瓷发热模型,讨论了影响热沉积系数的主要因素.结果表明：热沉积系数对Nd：YAG陶瓷的辐射量子效率、交叠效率以及激光提取效率的变化非常敏感.为有效减少介质内热沉积,在激光器优化设计中交叠效率和激光提取效率是需要着重考虑的参数.所得结果可为进一

拱形激光二极管侧抽运Nd∶YAG固体激光器的实验研究

详细阐述了同心抽运、同心冷却的激光二极管紧包侧抽运Nd：YAG激光器的实验研究工作。这种抽运结构使晶体内的增益场与谐振腔基模实现了良好的匹配，易于得到良好的光束质量和大能量输出，基模提取效率高。模拟分析了晶体内的增益场以及横截面内的温度分布，从不同角度探讨了激光二极管的温度特性对器件工作的影响。研究了晶体的热致退偏效应对器件调Q工作的影响．并且初步探讨了不同腔长、不同腔型下器件的工作情况，这些实验结果对进一步优化使用这种抽运结构有指导意义。所设计的激光器在工作频率6Hz时．得到了斜效率为44．3％的多模调

激光二极管侧面抽运调Q倍频Nd:YAG激光器

对高平均功率输出的激光二极管侧面抽运电光调Q倍频 Nd:YAG激光器进行了研究，当采用90个60W的脉冲激光二极管阵列抽运时，在重复频率为10Hz下，实现了最大平均功率为1180mW的1064nm红外激光输出，光-光转换效率为11%。腔外倍频获得600mW的532nm绿光输出，倍频效率达到50%以上。

A planar waveguide Nd : YAG laser using active Q-switching of a hybrid unstable resonator

A planar waveguide laser operating in a negative branch unstable resonator is Q-switched by an acoustooptic mod latorin anew configuration, providing effective, high-speed switching. The laser using a 200-mu m Nd:YAG core, face pumped by 10 laser diode bars, has produced 100-W output in a good beam quality at 100-kHz pulse rate, and 4.5 mJ at lower frequency with 15-ns pulse duration.

位相锁定来自同一侧面抽运Nd：YAG板条的两束激光

实验研究了腔内位相锁定来至一LAD侧面抽运的Nd：YAG板条的两束激光，输出镜面出现干涉条纹，获得1.13W的相干光，其组束效率达到64.9%，相干度约60%。实验中发现只需要一根作为滤波的金属丝放在离输出镜合适的位置都就能有效稳定干涉条纹，金属丝引起的损耗低于8%。

热退偏损耗完全补偿的千赫兹电光调QNd:YAG激光器

为了同时补偿固体增益介质的热致双折射及热透镜效应,进一步提高重复频率1 kHz激光二极管(LD)侧向抽运高平均功率电光调Q Nd:YAG激光器的输出功率,设计了一种完全消除热退偏损耗的双调Q开关谐振腔结构,此结构在传统调Q谐振腔的基础上沿着偏振片的退偏方向增加了一个调Q谐振支路,并使得激光从增益介质方向输出。实验结果表明,此激光器的单脉冲能量比单Q开关结构的非补偿腔输出能量高出74.7%。当侧面抽运的激光二极管输出脉冲能量达到307 mJ时,激光输出能量达到26.2 mJ,光-光转换效率为8.5%,光束发

High optical-optical efficiency of 52.5% obtained in high power Nd : YAG ceramic laser

Using a quite uniformly side-around arranged compact pumping system, a high power Nd:YAG ceramic quasi-CW laser has been demonstrated with high optical-to-optical conversion efficiency over 50% for the first time. With 450 W quasi-CW stacked laser diode bars pumping at 808 run. 236 W Output at 1064 run was obtained and no saturation phenomena were observed.

Nd : YAG ceramic laser obtained high slope-efficiency of 62% in high power applications

By using quite uniformly nine-stacks side-around arranged compact pumping system, a high power Nd:YAG ceramic quasi-CW laser with high slope efficiency of 62% has been demonstrated. With 450 W quasi-CW stacked laser diode bars pumping at 808 nm, performance of the Nd: YAG ceramic laser with different output coupling mirrors has been investigated. Optimum output power of 236 W at 1064 nm was obtained and corresponding optical-to-optical conversion efficiency was as high as 52.5%. The laser system operated quite stably and no saturation phenomena have been observed, which means higher output laser power could be obtained if injecting higher pumping power. The still-evolving Nd: YAG ceramics are potential super excellent media for high power practical laser applications. (c) 2005 Optical Society of America.

The analysis of the transient temperature distribution of double-slab Nd:YAG laser medium

A novel double-slab Nd:YAG laser, which uses face-pumped slab medium cooled by liquid with different temperatures on both sides, is proposed. The thermal distortion of wavefront caused by the non-uniform temperature distribution in the laser gain media can be self-compensated. According to the method of operation, the models of the temperature distribution and stress are presented, and the analytic solutions for the model are derived. Furthermore, the numerical simulations with pulse pumping energy of 10 J and repetition frequencies of 500 and 1000 Hz are calculated respectively for Nd:YAG laser medium. The simulation results show that the temperature gradient remains the approximative linearity, and the heat stress is within the extreme range. Then the absorption coefficient is also discussed. The result indicates that the doping concentration cannot be too large for the high repetition frequency laser. It has been proved that the high repetition frequency, high laser beam quality, and high average output power of the order of kilowatt of Nd: YAG slab laser can be achieved in this structure.

Kilohertz electro-optic Q-switched Nd : YAG ceramic laser

We investigate the lasing characteristics of a laser-diode-array side-pumped electro-optic Q-switched Nd:Y3Al5O12 ceramic laser operating at 1000 Hz pulse repetition rate. Using a YAG poltcrystalline rod with Nd3+ concentration at 1 at.% as the gain medium, pumping with 808 nm laser-diode-arrays, the Q-switched laser output at 1064 nm wavelength with 23 mJ pulse energy and less than 12 ns FWHM pulse width are obtained at a pumping power of about 400 W, the slope efficiency is around 15%, the output beam divergence angle is about 1.2 mrad.