CONSTANT TEMPERATURE BATH FOR SEMICONDUCTOR LASER LIGHT SOURCE DEVICE

摘要

PURPOSE:To highly stabilize the output characteristic by putting optical parts and elements inside a constant temperature bath and by constituting an LD double constant temperature bath using two Peltier elements. CONSTITUTION:A constant temperature bath 12 for optical parts and elements makes a temperature of optical parts and elements constant integrally including an LD constant temperature bath 2 to a photosensitive element 9 and a photosensitive element 10. A Peltier element 13 is provided to a part of an outer wall of the constant temperature bath 12 with the radiation side closely bonded thereto as a control element to control a temperature inside the constant temperature bath 12 and makes the temperature of the entire constant. A temperature sensor 16 is composed of a thermister and detects a temperature inside the constant temperature bath 2. A temperature sensor 16 is composed of a thermister and detects a temperature inside the constant temperature bath 12. A control section 17a controls the Peltier element 13 in accordance with a detected value of the temperature sensor 15. A control section 17b controls the Peltier element 13 in accordance with a detected value of the temperature sensor 16. Thereby, a constant temperature of the entire light source including optical parts and elements can be realized and output characteristic of an LD can be highly stabilized.