QSI 650nm 50mW Laser Diode is a semiconductor optoelectronic device emitting coherent red light at 650nm with an output power of 50 milliwatts. It is typically packaged with integrated heat management and optical collimation structures to ensure beam stability. The diode operates based on stimulated emission in a semiconductor junction, providing fast modulation and high efficiency. It is widely used in laser alignment systems, barcode scanning, machine vision, and optical sensing devices. Its compact structure allows integration into handheld and industrial optical modules.