端抽运板条放大器特性参数测试系统

Measurement System of Characteristic Factors of End-Pumped Slab Amplifier

利用端抽运板条放大器多角度通光的特点,建立了一套板条放大器各特性参数的测试系统,实现了动态加载条件下板条放大器的可提取功率、波前畸变及退偏度等多参数的同步测试。该系统包含千瓦级的窄线宽注入光源及提取功率测试系统,高精度热致波前畸变及退偏测试系统。当注入光源功率为2.7 k W,抽运电流为90 A时,板条放大器中可提取功率约为2.9 k W,波前畸变幅值差值小于1μm(27 mm口径),热致退偏约为5.1%。对比无注入光时测得的放大器相关特性参数,两者差异较大,说明了该测试系统对于准确掌握板条放大器性能的必要性。

Taking advantage of multi-angles light paths in end-pumped slab amplifier, a measurement system of characteristic factors of end-pumped slab amplifier is established, which can accurately detect the extracted power,wavefront distortion and depolarization at the same time. This system contains a kilo watt level and narrow linewidth seed source, highly accurate detectors of thermal induced wavefront distortions and depolarization. When the seed source is 2.7 k W and the pump current is 90 A, the extracted power from the slab amplifier is about 2.9 k W,the wavefront distortions is less than 1 μm（aperture of 27 mm）, and the depolarization is about 5.1%. Compared with the factors under the non- extraction, the differences between them are distinct, which proves that the detecting system is essential to accurately acquire the qualities of slab amplifiers.