单个激光二极管对称侧向抽运的固体激光器

采用一种半导体激光器侧向抽运的固体激光器新结构，可将一个半导体激光器的输出光分成四部分，从四面对称耦合到激光棒中，从而实现比较均匀的抽运。模拟计算了这种对称抽运结构中激光棒对侧面抽运光的吸收过程，得到了激光棒介质的吸收系数和直径等参量对激光棒内抽运光能量分布均匀性和能量吸收率的影响规律，并在此基础上对相关参量进行了优化。这种方案结构简单紧凑，很容易获得高光束质量的高功率固体激光输出。采用这种抽运结构制成了新颖的激光头，初步实验结果良好，表明该结构确实可行。     

Numerical analysis of polarization character in Yb~(3+)-doped fiber amplifiers

Polarization-dependent gain (PDG) and state of polarization (SOP) of the output signal light in Yb3+-doped fiber amplifiers are studied by numerically stimulation, which showed that PDG of output signal light is not only changed with the input pump power and signal power, input polarization of pump and signal light, but also changed with the doping concentration, the cross-section anisotropy, the fiber length, the phase difference of the fiber, and so on. Moreover, SOP of the output signal light is studied. It is found that the polarization of output signal light is relative not only to the phase difference of the fiber, polarization of pump and signal light as the non-doped fiber, but also to PDG of output signal light, the cross-section anisotropy, the doping concentration, and so on, which is different to the non-doped fiber.     

大功率激光二极管的微片棱镜堆光束整形和光纤耦合输出

提出用微片棱镜推实现大功率激光二极管线列阵器件的光束整形,进而实现光纤耦合输出。利用这一技术得到了直径为６００μｍ的光纤耦合输出的大功率半导体激光,总效率大于５０％。它具有易于制造、调整简便、结构简单的优点。文中从理论、计算机模拟以及实验三个方面对微片棱镜堆的整形进行了分析讨论。     

取石子的策略

本从取石子的策略出发，讨论了二进制中的异或操作的一般性质，在此基础上证明了关于异或操作在取石子中的应用。     

千瓦级半导体抽运的固体热容板条激光器

报道了千瓦级激光二极管面阵抽运固体热容激光器的理论与实验研究,分别采用Nd∶YAG单板条和双板条串接的热容激光器,利用热容激光器的理论计算模型计算了在一定的工作时间内激光输出特性,并进行了实验验证。实验中采用的晶体尺寸均为59mm×40mm×4.5mm,对单板条进行抽运时平均功率大约为5.6kW,双板条串接时为11.2kW,重复频率为1kHz,占空比为20%。实验中观察了1s的工作时间内脉冲能量输出的波动情况,单板条时单脉冲能量输出最大为1.3J,在1 s后单脉冲能量输出下降到开始的70%左右,而双板条串接时单脉冲能量输出最大为2.06J,在1s后单脉冲能量输出下降到开始的50%左右,对单块晶体采用通水冷却的准热容热管理模式能有效地降低其热效应。     

Yb∶YAG薄片激光介质的温度效应

研究了Yb∶YAG薄片激光器中影响激光介质温度的几个因素。理论和实验均表明减薄Yb∶YAG片并增加抽运光被YAG片吸收的次数 ,是降低激光介质温度、提高激光器输出功率和效率的有效途径。用 0 .35mm厚的Yb∶YAG薄片获得 15 .9W的 1.0 3μm激光输出 ,斜率效率超过 40 %。     

A Kilowatt Diode-Pumped Solid-State Heat-Capacity Double-Slab Laser

A kilowatt diode-pumped solid state heat capacity laser is fabricated with a double-slab Nd：YAG. Using the theoretical model of heat capacity laser output laser characteristics, the relationships between the output power, temperature and time are obtained. The slab is 59 × 40×4.5mm^3 in size. The average pump power is 11.2kW, the repetition rate is i kHz, and the duty cycle is 20%. During the running time of i s, the output energy of the laser has a fluctuation with the maximal output energy at 2.06 J, and the maximal output average power is 2.06kW. At the end of the second, the output energy declines to about 50% compared to the beginning. The therma/effects can be improved with one slab cooled by water. The experimental results are consistent with the calculation data.     

掺钕光纤放大器的弯曲损耗对增益的影响

利用掺钕光纤放大器的粒子数速率方程、功率传输方程和光纤弯曲损耗公式,对光纤弯曲损耗所引起的增益变化进行了数值模拟,分析了对于不同半径和波长下光纤弯曲损耗对光纤增益的影响,结果表明,对于一定长度的光纤,其增益随弯曲半径的减小而减小,当弯曲达到一定值时,增益发生急剧的降低;随弯曲半径的减小,其增益谱线发生下移,这对实验研究有着重要的指导意义。