Patent ID: 7796324

Claim:
A wavelength converting apparatus comprising: a laser resonator that oscillates an excitation light outputted from a laser light source and outputs a fundamental wave; a first wavelength converting element that converts a fundamental wave outputted from the laser resonator to a harmonic wave; a first temperature control element that controls the temperature of the first wavelength converting element; a second wavelength converting element that converts a fundamental wave outputted from the first wavelength converting element without being converted by the first wavelength converting element among the fundamental wave incident to the first wavelength converting element into a harmonic wave; a second temperature control element that controls the temperature of the second wavelength converting element; a first detecting portion that detects an output of a harmonic wave outputted from the first wavelength converting element; a second detecting portion that detects an output of a harmonic wave outputted from the second wavelength converting element; and a controller that manages temperature control of the first wavelength converting element by the first temperature control element, temperature control of the second wavelength converting element by the second temperature control element, and current value control of a driving current applied to the laser light source, wherein the controller sums a first detected value by the first detecting portion and a second detected value by the second detecting portion, and performs temperature control of the first and second wavelength converting in accordance with respective increases or decreases of the first and second detected values so that the summed value has a constant value.