分光线分光器
Light divider
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
Then you send laser light through a beam splitter to divide the beam between the two arms, and let the light bounce back and forth a few times before returning to the beam splitter.
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