基于耦合的Ginzburg-Landau方程和各器件的琼斯矩阵，建立了全正色散锁模光纤激光器的数值模型，计算了腔内各点脉冲不同部分的偏振态。计算结果表明，当线性双折射较强时，光纤中脉冲的偏振态近似以拍长为周期变化，一个拍长内的演化过程为右旋椭圆偏振光线偏振光左旋椭圆偏振光线偏振光右旋椭圆偏振光。与一般的饱和吸收体不同，非线性偏振旋转等效饱和吸收体的调制深度随波片角度变化。计算了波片方位角改变时，调制深度的变化情况。相比于偏振分束器之前的1/2波片及1/4波片，偏振分束器之后的波片对调制深度的影响更大。

以双包层掺镱光纤为增益介质，双折射滤光片为波长选择器件，搭建了可调谐耗散孤子锁模光纤激光器。通过旋转滤光片，激光器的输出波长在1063.9～1091.1 nm范围内连续可调，脉冲宽度及光谱带宽的变化范围分别为13.9～16.8 ps和15.8～18 nm。中心波长为1063.9 nm时，激光器输出功率为212 mW，单脉冲能量为8.5 nJ。基于耦合的Ginzburg-Landau方程和各器件的琼斯矩阵，建立了可调谐耗散孤子锁模激光器的数值模型，对激光器的可调谐性能进行模拟，模拟结果与实验结果一致。

为了分析影响双块晶体电光开关消光比的各项因素，采用折射率椭球方法，进行了理论分析和实验验证。结果表明，两晶体通光方向偏差及偏振器件透振方向偏差对消光比影响较大，只要仔细调解上述两方面就能实现较好的电光调Q效果。

采用一种新型的Nd∶YVO4/YVO4复合晶体,利用V型折叠腔,研究了高功率激光二极管端面泵浦的Nd∶YVO4/YVO4复合晶体激光器基频1.06 μm及倍频532 nm激光的输出特性.当泵浦功率为24.6 W时,获得1.06 pm激光的最大输出功率为11.7 W,光-光转换效率为48%.当泵浦功率为17 W时,获得了5.32 W的绿光输出,光-光转换效率达到31.3%.

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 crystal could be adopted to reduce thermal effects and improve laser performance. Diffusion bonding crystal has been demonstrated to be an effective method to relieve the thermal lensing theoretically based on the numerical heat analysis to the end-pumped anisotropic laser crystal. The temperature distribution in Nd:YVO4/YVO4 composite crystal was analyzed before the end-pumped Nd:YVO4/YVO4 composite crystal laser with V cavity was designed and set up. The maximum output powers of 9.53 W at 1064 nm, 5.01 W at 532 nm were obtained while the pumping power was 17 W. The highest optical to optical conversion efficiencies were up to 59.1% at 1064 nm and 34.4% at 532 nm, respectively.

Thermal effect in crystals is the main obstacle blocking diode-pumped solid state laser to get high and stable output power. Diffusion bonding crystal has been demonstrated to be an effective method to relieve the thermal lensing theoretically based on the numerical heat analysis to the end-pumped anisotropic laser crystal. The temperature distributions in Nd:YVO4/YVO4 composite crystal and conventional crystal were analyzed and compared. The end-pumped Nd:YVO4/YVO4 composite crystal laser was designed and set up with z-cavity. The maximum output powers of 9.87 W at 1064 nm and 6.14 W at 532 nm were obtained at the incident pump power of 16.5 W. The highest optical-optical conversion efficiencies were up to 59.8% at 1064 nm and 37.2% at 532 nm respectively.

在相同的实验条件下, 分别采用平平直腔和V型折叠腔对比了Nd:GdYVO4和Nd:YVO4两种晶体的基频和腔内倍频特性。采用平平直腔在抽运功率为10.64 W时分别获得了5.35 W、6.29 W的1.06 mm基频输出, 光－光转换效率达50.3％、59.1％, 斜效率达58.1％、68.8％；采用V型折叠腔KTP腔内倍频, 在抽运功率为6.71 W时分别获得了1.73 W和2.34 W的稳定倍频绿光输出, 光－光转换效率达25.8％、34.9％。比较得出, Nd:GdYVO4－KTP绿光激光器的平均输出功率及稳定性均低于Nd:YVO4－KTP绿光激光器。

在高功率激光二极管(LD)抽运的情况下, 对比分析了Nd:YVO4/YVO4复合晶体和Nd:YVO4单一晶体的激光特性。实验证明, 复合晶体能够有效地降低晶体内的温度梯度, 减小由端面变形带来的热透镜效应, 获得比单一晶体高出许多的输出功率。采用Z型折叠腔, 研究了Nd:YVO4/YVO4复合晶体KTP倍频特性, 当抽运功率为17 W时, 获得了6.23 W的绿光输出, 抽运光到绿光的转换效率高达37%。

采用一种新型的被动调Q饱和吸收体，低温生长GaAs薄膜，实现了半导体抽运Nd∶YVO₄激光器的调Q运转．研究了激光器的调Q特性，调Q抽运阈值为2W．在抽运功率9．2 W时，获得的最短脉冲半峰全宽为15ns，最大单脉冲能量为4．84μJ，最高峰值功率为330 W，最大平均输出功率为1．16 W；脉冲重复频率在220 kHz到360 kHz之间．

利用激光二极管(LD)阵列侧面抽运声光(AO)调Q的Nd∶YAG激光器作为抽运源,研究了在不同声光重复频率和输出镜透过率的情况下,内腔式KTA-光参量振荡器(OPO)的输出特性。通过对单谐振光参量振荡器阈值公式的讨论,采用平凹腔的结构以及较短的腔长,降低了光参量振荡器的振荡阈值。当声光重复频率为4 kHz,输出镜透过率为30%,抽运电流为14.5 A时,光参量振荡器的1570 nm激光输出脉冲峰值功率达到5.6×104 W,脉冲宽度为2.5 ns,实验中最大平均输出功率为560.3 mW。结果表明,具有良好热性能的非线性晶体KTA是制造小型、轻便光参量振荡激光器的理想材料。