PURPOSE: To suppress the average current value of a drive current supplied, and improve the conversion efficiency of waves by nonlinear optical phenomena, and besides, lessen battery power depletion by adding a modulation means to a drive means so as to modulate and convert the drive current.
CONSTITUTION: In a drive power source 2, a pulse drive circuit 5 drives an ACC drive circuit by pulses and supplies a semiconductor laser part 3 with pulse currents Ip. The semiconductor laser part 3 drives a semiconductor laser drive 7 and the emitted light is condensed by a converging lens 8, and is emitted to a wavelength converter. In the wave length converter, the light emitted from the semiconductor laser part 3 is entered into a laser oscillator 12, and an Nd:YAG laser medium 10 is excited by the exciting light emitted from the semiconductor laser device 7, and the wavelength of this emitted laser beam is converted into one of green visible light by KPT 11, and is emitted, being amplified in the solid laser oscillator 12. Hereby, the average drive current value is made small, whereby the wavelength conversion efficiency can be improved.
UDAGAWA TOSHIKI
ARAI MICHIO
