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How much residual amplitude modulation (RAM) is there?

April 26, 2017Amplitude modulation RAM residual

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How much residual amplitude modulation (RAM) is there?

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A perfect phase modulator will have no RAM. However, residual étalons in the modulator crystal will lead to amplitude modulation. With careful adjustment of the optical beam’s alignment and polarization, you can expect a residual amplitude modulation of -60 dB for a 1-radian peak phase shift.