Optical kit and optical device

An optical kit forming an optical system including an external resonator of a laser light source that outputs a laser light, the kit comprising:

• a base including a main surface;
• and
• a holding unit provided on the main surface and configured to hold the optical system,
• wherein the optical system includes a lens into which the laser light is input in a first direction,
• a corner reflector including a reflective diffraction grating configured to reflect a diffracted light of the laser light, which has passed through the lens, in a second direction intersecting the first direction, and a mirror configured to reflect the diffracted light from the reflective diffraction grating in a third direction opposite to the first direction,
• a first aperture member disposed to form an optical aperture through which the laser light which has passed through the lens passes when the corner reflector is not installed, and
• a second aperture member and a third aperture member arranged in the third direction to form optical apertures through which the diffracted light from the corner reflector passes in order,
• the holding unit includes a lens holding unit configured to hold the lens,
• a reflector holding unit configured to hold the corner reflector,
• a first aperture member holding unit configured to hold the first aperture member,
• a second aperture member holding unit configured to hold the second aperture member, and
• a third aperture member holding unit configured to hold the third aperture member, and
• the reflector holding unit includes a first mechanism configured to hold an entirety of the corner reflector so as to be rotatable along the main surface, and
• a second mechanism configured to adjust an optical axis of the diffracted light in each of the reflective diffraction grating and the mirror.