For the air-spaced polarising prism the air-gap thickness can be decreased infinitely to gain the large semi-field angle, or otherwise the extinction ratio is affected seri-ously.

 
  • 空气间隔偏振棱镜的气隙厚度可无穷减小,以获得大的半视场角,但其消光比将受到严重影响。
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