利用吸收或折射掉不需要的成分，把非单色光束变成单色光束的装置。
A device for converting heterogeneous beam of radiation to homogeneous beam by absorption or refraction of unwanted components.
利用吸收或折射掉不需要的成分，把非单色光束变成单色光束的装置。
A device for converting heterogeneous beam of radiation to homogeneous beam by absorption or refraction of unwanted components.
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