| abstract |
The present invention provides a solid-state laser device that is small, low-cost, high in stability, and capable of realizing CW mode synchronization in the femtosecond range. A solid-state laser medium 15 and a saturable absorption mirror 16 are arranged close to each other at a distance equal to or less than twice the Rayleigh length. In addition, the absorption modulation depth ΔR of the saturable absorber mirror 16 is set to 0.4% or more, and light having a predetermined wavelength reciprocates once in the resonator expressed by a predetermined relational expression with respect to the pulse width. The absolute value | D | (where D <0) of the total dispersion amount in the resonator is set within a pulse band in which an operation mode other than the soliton pulse of the fundamental period can be suppressed by the saturable absorption mirror 16, and as an output mirror, to light 18 of a predetermined wavelength, the mirror dispersion amount is -1000fs 2 ~-100fs 2, and the reflection coefficient which negative dispersion mirror 5 is 97% to 99.5%. [Selection] Figure 1 |