ULTRASHORT PULSE LIGHT SOURCE, AND TWO-PHOTON ABSORPTION RECORDING MEDIUM RECORDING APPARATUS HAVING THE SAME

摘要

PPROBLEM TO BE SOLVED: To obtain a practical ultrashort pulse laser light source capable of recording information on two-photon absorption recording medium at high-speed and stably. PSOLUTION: The ultrashort pulse laser light source includes: a soliton mode-locked solid-state laser 10 that includes a resonator having one end composed of a semiconductor saturable absorbing mirror 14, a solid-state laser medium 16, a negative group velocity dispersion compensator 19 for compensating for group velocity dispersion within the resonator, and an excitation optical system 13 that outputs excitation light Lo for exciting the solid-state laser medium 16, and oscillates soliton pulse laser light L with a repetition frequency of not less than 1 GHz; an intensity modulator 30 that includes a waveguide electrooptic modulator 31 for modulating intensity of the soliton pulse laser light L and a driver 32 for applying a voltage to the waveguide electrooptic modulator 31 according to desired information; and a nonlinear optical element 40 for converting the intensity-modulated soliton pulse laser light Lm to a second harmonic wave. PCOPYRIGHT: (C)2011,JPO&INPIT