Abstract: In an optical device the light emitting unit emits first light and second light having different polarization states. The light generation unit generates third light on the basis of the first light and the second light whose phase difference has been adjusted by the phase adjustment unit. The first light and the second light are incident on a birefringent element. A control unit controls at least one of a temperature of the birefringent element and a voltage applied to the birefringent element. The light generation unit includes a nonlinear optical element generating the third light on the basis of at least one of the first light and the second light. The first light and the second light emitted from the birefringent element are incident on the nonlinear optical element of the light generation unit.

Abstract: A laser medium unit includes a laser gain medium that is formed in a plate shape, that has a first surface and a second surface, and that generates emission light upon irradiation with excitation light from the first surface; and a light guiding and cooling member connected to the first surface to guide the excitation light toward the first surface and to cool the laser gain medium. The first surface consists of a first region to which the light guiding and cooling member is thermally connected, and a second region other than the first region. An entirety of the second region is thermally isolated from the light guiding and cooling member.

Abstract: A wavefront measurement device includes: a phase modulation unit having a spatial light modulator on which incident light is incident; a pattern generation unit configured to generate a phase pattern to be inputted to the spatial light modulator; an imaging unit having an imaging region for imaging an image of a portion of the incident light modulated by the spatial light modulator as measurement light; and an analysis unit configured to analyze a wavefront of the incident light based on an imaging result by the imaging unit, in which the pattern generation unit generates a plurality of phase patterns for which a measurement virtual pattern is shifted to positions different from each other such that a focused spot of the measurement light modulated by the spatial light modulator shifts over time to different positions in the imaging region.

Abstract: Disclosed is a laser device including: a rod-shaped laser medium extending in a first direction; a first light source unit including a first base having a first notch through which the laser medium passes and a plurality of excitation light sources attached to the first base; and a holder supporting the laser medium and the first light source unit. At least one of the first base and the holder includes a first regulating part configured to regulate a position of the first base with respect to the holder.

Abstract: Disclosed is a laser device includes: a rod-shaped laser medium extending in a first direction; a first light source unit including a first base and a plurality of excitation light sources; a second light source unit arranged side by side with the first light source unit in a second direction intersecting with the first direction, the second light source unit including a second base and a plurality of excitation light sources; and a holder supporting the laser medium, the first light source unit, and the second light source unit. At least one of the first base and the holder includes a first regulating part configured to regulate a position of the first base with respect to the holder, and at least one of the second base and the holder includes a second regulating part configured to regulate a position of the second base with respect to the holder.

Abstract: A laser device includes a first laser medium and a second laser medium that have a first surface and a second surface opposite to the first surface, and receive input of excitation light and seed light from the first surface side to amplify the seed light, a holder that holds the first laser medium and the second laser medium; and a pair of cooling units that cool the first laser medium and the second laser medium according to change in volume of a refrigerant.

Abstract: A laser device includes a first laser medium and a second laser medium that have a first surface and a second surface opposite to the first surface, and receive input of excitation light and seed light from the first surface side to amplify the seed light, a holder that holds the first laser medium and the second laser medium; and a pair of cooling units that cool the first laser medium and the second laser medium according to change in volume of a refrigerant.