Patent ID: 7855830

Claim:
An optical output controller comprising: a wavelength conversion device operable to change the wavelength of pumped laser light; a heating/cooling unit operable to control the temperature of the wavelength conversion device; a temperature detector operable to detect the temperature of the wavelength conversion device; a temperature controller operable to control the heating/cooling unit such that the detected temperature corresponds to a target temperature; an optical output detector operable to detect the optical output from the wavelength conversion device; an optical-output maximization controller operable to determine a temperature at which the optical output is maximized according to the optical output detected by the optical output detector and the detected temperature detected by the temperature detector and, further, operable to output the temperature difference between the determined temperature and the detected temperature; and an adder operable to add the temperature difference outputted from the optical-output maximization controller to the target temperature, wherein the temperature difference is added to the target temperature to correct the target temperature value for maximizing the optical output.