Patent ID: 6292500
Filing Date: 2001-09-18
Classification: H01L,H01S

Abstract:
A semiconductor laser device comprising:a semiconductor laser chip including: an anode, a cathode and an active layer, the semiconductor laser chip oscillating a laser beam from a light-emitting region of the active layer when an electric current flows from said anode to said cathode; anda field effect transistor having a source, drain, and gate, said anode of said semiconductor laser chip being connected to said drain of said field effect transistor, said gate of said field effect transistor being connected to said drain of said field effect transistor, and said cathode of said semiconductor laser chip being connected to said source of said field effect transistor;wherein an absolute value of a threshold voltage of said field effect transistor is larger than an absolute value of a bias voltage of said semiconductor laser chip so that when a voltage exceeding a threshold voltage of said field effect transistor is applied to said semiconductor laser chip, a surge current flows through and is absorbed by said field effect transistor.