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用Ｊｏｎｅｓ算法讨论了半波片和偏振片组合衰减装置的一般特性，得出了衰减量控制精度的表达式。最后给出了４５ｍｍ石英晶体半波片和偏振片组合衰减装置的实验结果。
The general characteristics of half-wave plate and polarizer combined attenuator are discussed by using Jones algorithm, and the expression of the control accuracy of attenuation is obtained. Finally, the experimental results of 衰 45mm quartz crystal half-wave plate and polarizer combination attenuator are given.