Abstract
Highly coherent semiconductor lasers are indispensable for accurate coherent optical systems, and a field spectral linewidth as narrow as 7 Hz has been achieved by employing negative electrical feedback (NEF) technique.1 Because using genuine optical frequency discriminators (OFD) have not existed, the slope of the resonance spectral shape of a super Fabry-Perot interferometer (FPI) has been tentatively used in the NEF experiment. However, demand is growing for a high quality OFD for use in a computer- aided channel selection scheme of frequency division multiplexing coherent optical communcations2, and for a very long-baseline interferometer for gravitational wave detection.
© 1991 Optical Society of America
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