Observation of Acoustic Signals from Semiconductor Lasers

Acoustic signals were observed from GaAs-GaAlAs double-hetero (DH) semiconductor lasers. The current-injection-induced acoustic (CIA) signals observed from channeled-substrate planar (CSP) lasers were saturated at the current levels less than the lasing threshold current, i.e., at 70–80% of I th . In the current range of a kink in light output versus current characteristics, an anomaly was observed in the characteristics of CIA signals.