Ultrashort pulse light source and two-photon absorption recording medium recording apparatus having the same

摘要

Providing a practical ultrashort pulse laser light source capable of recording information on two-photon absorption recording media at high-speed and stably. Providing a soliton mode-locked solid-state laser (10) that includes a resonator, 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.