高能COIL偏振态的实验研究

 通过两块楔镜补充衰减和中性衰减片相结合的能量衰减方法，测得了功率密度为20 W/mm² COIL的偏振态。采用角反射器作为稳定腔折返装置，提高了激光能量分布的均匀性。激光光束分别以45°的入射角入射到两块楔镜上，被楔镜反射后，垂直通过中性衰减片，最后进入偏振态测试仪。实验结果表明：在腔内没有任何偏振选择器件和不加外部电磁场的情况下，采用折叠式稳定腔的横流双模块氧碘化学激光光束呈现部分偏振性质，而且在出光过程中偏振度逐渐降低。

Experimental study on the polarization of high power COIL

Through the energy attenuation method of combining two cuneiform prisms and a neutral attenuator, the polarization of COIL whose power density is 20 W/mm2 was measured. The corner cubes were used as the retroreflectors of stable cavity, thus the uniformity of laser power was improved. The laser beam irradiated the two prisms with 45° incident angle and were reflected by the cuneiform prisms. Then the beam passed normally through a neutral attenuator, and was received by a polarimeter at last. Experimental results indicate: At zero electromagnetic field the light of transverse flow of two modules of COIL without any polarizing elements is partially polarized if the resonator configuration is a foldaway stable cavity, moreover, the degree of polarization decreases gradually in the course of