DRIVING DEVICE FOR SEMICONDUCTOR LASER EXCITATION SOLID-STATE LASER, AND SEMICONDUCTOR LASER EXCITATION SOLID-STATE LASER DEVICE

摘要

PROBLEM TO BE SOLVED: To reduce optical noise caused by switching while achieving high conversion efficiency in a semiconductor laser excitation solid-state laser.;SOLUTION: As a power supply circuit for supplying power to a semiconductor laser 101 of a semiconductor laser excitation solid-state laser 100, a switching power supply circuit 11 is used. The switching power supply circuit is a voltage conversion type that improves conversion efficiency, and has a sufficiently higher switching frequency than a relaxing oscillation frequency f_RO of a solid-state laser of the semiconductor laser excitation solid-state laser 100. Therefore, optical noise caused by switching noise is reduced. Further, a potential indicating a magnitude of a voltage drop that occurs in a transistor (Q2) and a resistor Rs for current monitor is inputted to a feedback input terminal 11b of the switching power supply circuit 11 via a resistor R3. Thus, even if a forward voltage of the semiconductor laser 101 is changed, a supply voltage from the switching power supply circuit 11 is controlled at a value required for driving the semiconductor laser 101, and heat generation in the transistor (Q2) is suppressed to an irreducible minimum.;SELECTED DRAWING: Figure 3;COPYRIGHT: (C)2016,JPO&INPIT