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The high-frequency modulation reference light and the optical signal to be tested are reflected to the photoelectric sensor by a semi-permeable semi-reflector.

高频调制参考光和被测光信号是通过半透半反光镜照 射到光电传感器上。

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In order to decrease the wave aberration, we propose to use the parallel light as reference light, and reconstruct the master hologram by using the inverse light road.

为了把波像差的影响减少至最小，我们建议使用平行光做参考光，并用逆光路再现母全息图。

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President Obama even made a light-hearted reference to Mr Netanyahu's warning of a "red line" with Iran's nuclear programme.

BBC: Obama limo breaks down in Israel after 'fuel mix-up'

The gift was a light-hearted reference to US Vice-President Joe Biden's recent remark that the new US administration wanted to reset ties with Russia after years of friction.

BBC: Button gaffe embarrasses Clinton

Now, perhaps, the memory of his life can serve as a light for others, as a point of reference on our horizons.

CNN: ASIANOW - TIME Asia | To Our Readers: A Legacy of Public Service