The effects of optical medium including lightbeamsplitter and reflecting metallic film on laser polarization state in a coherent CO_2 lidar are discussed.
Then you send laser light through a beamsplitter to divide the beam between the two arms, and let the light bounce back and forth a few times before returning to the beamsplitter.
然后你通过分光器发射一束激光，让光线在两条边不断反射再回到分光器。
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The returning light beams merge together at the beamsplitter and create an interference pattern of light and dark regions where the light waves either cancel out or reinforce each other.