大口径高通量验证实验平台的三倍频能量测量

Measurement of the third harmonic energy of a large-aperture high power laser

为了完成大口径高通量验证实验平台建造初期的三倍频能量测量,采用凹面镜缩束方式取样的方法,利用新型玻璃吸收元件完成光束的滤波,实验测试了新型玻璃吸收元件对测试结果的影响。结果表明,采用新型玻璃吸收元件可以获得干净的三倍频光,剩余基频、二倍频光的影响在0.4%左右,整个三倍频能量测量的测量不确定度可以控制在5%以内,保证了激光装置能量测量的可靠性。

In order to measure energy of the third harmonic （ TH） of a large aperture high power laser experiment platform, with a concave mirror sampling the beam , with a novel absorbing glass element filtering the beam , the influence of the absorbing glass element on the measurement result was experimentally tested .According to the data analysis , by using such a novel absorbing glass element , pure TH laser can be obtained and the influence of the residual fundamental and the second harmonic light is about 0.4%.The uncertainty of energy measurement of the entire TH laser energy can be controlled within 5%, which guarantees the reliability of energy measurement for the laser facility .