The FP-D-660-40-C-F is a laser diode module from Laser Components, Inc. It is a 40 mW, 660nm red laser diode module. The module features a round housing with a built-in collimator lens and an integrated fan for cooling. It delivers a focused, narrow beam of light with an optical power density of 10mW/cm2 and an operating voltage range of 4.5 to 5.5V. It is designed for use in applications such as marking, engraving, curing, and machine vision.