The FP-D-635-17-C-F part is a laser diode module by Laser Components. It is an infrared emitter that provides 635 nm light with a maximum output power of 17 mW. It is packaged in a TO-18 can and requires a current of 20mA. This laser diode is suitable for a variety of applications such as fiber coupling, scanning, optical testing, and laser beam alignment. It is also used in medical diagnostic and imaging equipment.