Abstract

We report here a study of the fundamental mechanisms which account for the spectral linewidth of cw single-frequency (GaAl)As diode lasers. The experiments were carried out on a number of Mitsubishi transverse-junction-stripe (TJS) and Hitachi channel-substrate-planar (CSP) lasers at 273, 195 and 77 K. The linewidths shown in Fig. 1 were observed to increase linearly with reciprocal output power¹ at all temperatures. However, a power-independent contribution² to the laser linewidth was also observed which increased in magnitude with decreasing temperature.

© 1982 Optical Society of America