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Frequency and amplitude modulation in extended cavity diode lasers

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Abstract

A methodology has been developed and experiments performed to measure the frequency and amplitude modulation and their relative phase resulting from current modulation of an extended cavity diode laser system. The FM sensitivity SFM in an extended cavity laser, defined as the normalized frequency deviation per unit current (MHz/mA), is reduced from the raw diode value by the factor (1 + X), where X=(τe/τd)η,1 where η is the optical feedback and τe and τd are the round trip times in the external cavity and diode cavity. The low values of the FM sensitivity for long cavities (~6 MHz/mA was measured here) make a beat measurement technique more desirable than direct measurement of small optical frequency shifts.

© 1987 Optical Society of America

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