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Direct demodulation of a 10.6µm FM signal with an NH2D stark cell

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2 Author(s)
Abrams, R.L. ; Hughes Research Laboratories, Malibu, CA, USA ; Asawa, C.K.

A new technique for direct demodulation of a 10.6-μm FM signal using a Stark absorption cell is described. A Stark tunable absorption line in NH2D is used to track the time-varying frequency of the incoming FM laser signal using a closed servo loop. The demodulated FM signal is proportional to the feedback voltage applied to the Stark cell. Demodulation at frequencies up to 5 kHz has been demonstrated, the rate being limited only by the bandwidth of the available servo electronics.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:12 ,  Issue: 10 )