This 685 nm, 50 mW TO packaged laser diode is a compact light source that outputs a single transverse mode and is suited for a variety of applications such as test and measurement, laser module, or sensing. It is packaged in a standard Ø5. The laser is mounted in a heat-sink bracket that allows for multiple mounting options. 12, and terminated with an FC/PC connector. HL6750MG - Ask a technical question Ask a technical question. Product. Check out our collection of 685 nm Fabry-Perot laser diodes with different optical powers. These diodes feature a built-in photodiode for precise monitoring and feedback control of the laser's output power. Housed in standard TO packages, these diodes are pigtailed to a 1-meter long single-mode.