OPTICAL OUTPUT CONTROLLER AND ITS CONTROL METHOD

摘要

An optical output controller comprises a wavelength conversion element for converting wavelength of exciting laser light; a heater/cooler for controlling temperature of the wavelength conversion element; a temperature detector for detecting the temperature of the wavelength conversion element; a temperature controller for controlling the heater/cooler such that the temperature detection value accords with a temperature target value; an optical output detector for detecting optical output from the wavelength conversion element; an optical output maximization controller which obtains a temperature that maximizes the optical output, based on the optical output detected by the optical output detector and the temperature detection value obtained from the temperature detector, and outputs the temperature difference from the temperature detection value; and an adder for adding the temperature difference outputted from the optical output maximization controller to the temperature target value. The temperature target value is corrected to maximize the optical output by adding the temperature difference to the temperature target value.