<p>A lidar includes CW laser light sources 1 and 2 that oscillate CW laser light rays with wavelengths different from each other; an optical multiplexing coupler 3 that mixes the CW laser light rays oscillated by the CW laser light sources 1 and 2; an optical branching coupler 4 that splits the CW laser light passing through the mixing by the optical multiplexing coupler 3; a light modulator 5 that modulates first CW laser light split by the optical branching coupler 4; and an optical fiber amplifier 6 that amplifies the laser light modulated by the light modulator 5, in which a transmit-receive optical system 8 irradiates a target with the laser light amplified by the optical fiber amplifier 6, and receives scattered light of the laser light by the target.</p>
