Abstract
Narrow linewidth semiconductor lasers are key devices for coherent optical measurement and communication systems. The authors believe that electrical feedback is a promising technique for reducing the linewidth in a very stable manner.1 It is proposed that wideband electrical feedback can be realized by using reflected light from a high finesse Fabry-Perot cavity, and subkilohertz linewidths can be obtained. The experimental setup is shown in Fig. 1.
© 1989 Optical Society of America
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