High-power and high-efficiency operation of an all-solid-state,quasi-continuous-wave,titanium sapphire laser system

High-power and high-efficiency operation of an all-solid-state, quasi-continuous-wave, titanium sapphire laser is obtained with a diode-laser-pumped frequency-doubled Nd:YAG laser as the pump source. A maximum output power of 2.5 W is obtained for 16-W power of 532-nm pump light. A much higher conversion efficiency of 15.7% is obtained when at the maximum output power.     

Diode end-pumped 1123-nm Nd:YAG laser with 2.6-W output power

We present a compact and high output power diode end-pumped Nd:YAG laser which operates at the wavelength of 1123 nm. Continuous wave (CW) laser output of 2.6 W was achieved at the incident pump power of 15.9 W, indicating an overall optical-optical conversion efficiency of 16.4%, and the slope efficiency was 18%.     

用非球面透镜制作光纤约1∶1空间耦合器

针对光纤的泵浦耦合问题,对由两片非球面透镜组成的接近1∶1光纤间空间耦合器进行了计算和实验验证.利用高斯光束的变化规律对光路进行了分析研究,并根据二极管输出光相干性不好的特点,对非球面透镜进行了光路追迹的模拟计算.研究发现,在泵浦光波长等因素发生变化时,利用椭球面透镜组成的耦合系统较双曲面透镜有更高的稳定性.实验中选用符合计算结果要求的非球面透镜组成耦合装置,利用一台二极管激光器(尾纤输出端面直径约200μm,N.A.约0.2)泵浦一段芯径约200μm(N.A.约0.42)的多模光纤,耦合装置的透过率约95%,在光纤端面有反射的条件下约90%的泵浦光耦合进光纤.     

用非球面透镜制作光纤约1:1空间耦合器

针对光纤的泵浦耦合问题,对由两片非球面透镜组成的接近1:1光纤间空间耦合器进行了计算和实验验证.利用高斯光束的变化规律对光路进行了分析研究,并根据二极管输出光相干性不好的特点,对非球面透镜进行了光路追迹的模拟计算.研究发现,在泵浦光波长等因素发生变化时,利用椭球面透镜组成的耦合系统较双曲面透镜有更高的稳定性.实验中选用符合计算结果要求的非球面透镜组成耦合装置,利用一台二极管激光器(尾纤输出端面直径约200 μm,N.A.约0.2)泵浦一段芯径约200 μm(N.A.约0.42)的多模光纤,耦合装置的透过率约95%,在光纤端面有反射的条件下约90%的泵浦光耦合进光纤.