Abstract

Many applications, such as coherent optical measurement and coherent optical communication, rely on the narrow linewidth of diode lasers. Several techniques, such as negative electrical feedback, optical feedback, a combination of optical and electrical feedback, and amplitude or phase squeezing,^1-3 have been used to achieve narrow linewidths. Among these techniques, negative electrical feedback is effective in preserving the small cavity and mechanical stability of a solitary diode laser. Unlike optical feedback and injection locking, in which both AM and FM noise are reduced simultaneously, negative electrical feedback is associated with an increase in intensity noise accompanying a reduction in frequency noise.

© 1995 Optical Society of America