稳腔固体激光器运转时热透镜焦距的测量

给出一测量激光二极管 (LD)端面抽运固体激光器稳态运转时腔内激活介质热透镜焦距的简便方法。采用混合模类高斯光束描述激光器输出镜后的光场分布 ,通过一狭缝在不同位置横向扫描光场来测得光束的光斑尺寸和描述光束的质量因子M2 ,根据混合模类高斯光束传播规律推导出光束的束腰及在相同激光器参数下对应的基模高斯光束束腰的大小 ,由此利用稳定谐振腔标准传输矩阵理论可得到相应的激光介质的热透镜焦距。基于上述测量原理 ,对LD端面抽运Nd∶YVO4 固体激光器热透镜焦距进行了测量 ,实验结果和理论分析相符。     

飞秒激光功能扩展及精确控制

近年来飞秒激光技术持续地快速发展，不仅深化着强场物理、超快现象、THz辐射等学科的研究内容，而且也促成了飞秒激光频标测量技术、飞秒激光精密微加工技术、飞秒纳米学、阿秒激光脉冲产生等新学科的出现和重大突破。对于目前飞秒激光所涉及的众多应用研究，通常需要具有特性不同的飞秒脉冲，如强场物理研究突出的是飞秒激光的峰值     

Theory of intracavity-frequency-doubled solid-state four-level lasers

The spatial distributions of the pumping, the population inversion density, and the intracavity photon densities of the fundamental and the second harmonic are taken into account in the rate equations of the intracavity-frequency-doubled cw lasers. By normalizing the related parameters, it is shown that the general solution of these space-dependent rate equations is dependent upon three dimensionless parameters: the pump to laser-mode size ratio, the normalized pump level, and a parameter written as ηSHG, which is related to the ability of the nonlinear crystal to convert the fundamental to the second harmonic. By numerically solving these rate equations, a group of general curves are obtained to express the relations between the solution and the three dimensionless parameters. In addition, the optimal pump to laser-mode size ratio and the optimal ηSHG are determined. A comparison with the result obtained under the plane-wave approximation is also given.     

LD纵向泵浦固体激光器参数优化

通过对四能级系统速率方程的分析,采用Ｍ＾２因子来描述泵浦光在激活介质中的传播规律,给出了含有泵浦光光束质量因子Ｍ＾２和激活介质特征参数在内的泵浦阈值、输出功率和斜转换效率的解析表达式大激活介质中泵浦光有效 浦体积最小的条件下,对输出功率进行了最佳化,从而确定激光腔的最优参数选择。据上述理论,对ＬＤ纵向泵浦、自聚焦透镜耦合的Ｎｄ：ＹＶＯ４激光器进行了研究,实验结果与理论相符。