Wavelength selecting method in wavelength tunable laser and wavelength selectable laser oscillator in wavelength tunable laser

摘要

An object of the present invention is to electrically tune and control an oscillating wavelength of a laser at high rate having a good reproducibility without providing any mechanically movable section in the laser resonator. To achieve the object, a laser oscillator is provided comprising a laser resonator composed of a mirror on the output side and a total reflection mirror, a Ti:Al2O3 laser crystal disposed in the laser resonator, an acousto-optic crystal disposed in the laser resonator and to which are inputted the outputting light rays from the Ti:Al2O3 laser crystal, a piezoelectric element mounted on the acousto-optic crystal to input acoustic waves thereto, and a diffraction light ray correcting prism disposed in the laser resonator and for correcting an angle of deflection of the diffraction light rays outputted from the acousto-optic crystal.