There is provided a solid-state laser device (10) including: a resonator; a solid-state laser medium (18) disposed in the resonator; an excitation section that irradiates an excitation beam into the solid-state laser medium (18); a mode selector (26) that controls transverse modes of oscillating light in the resonator; and a movement section (28) that moves the mode selector (26) along the resonator optical axis direction (Z).
The laser may be mode-locked with a SESAM (12) and the laser medium may be Yb: KYW. The transverse mode selector may be a knife edge (26) which is translated with the help of a holder (28) resulting in a single transverse mode emission of the laser.