QSI 650nm 5mW Red Laser Diode Built-in Photo Diode for Monitoring Laser Diode
The QSI QL65D5S series is a compact, high-performance visible laser diode, grown via MOCVD with a quantum well structure to deliver reliable 650nm red light. Designed as a versatile light source, it outputs a typical 5mW continuous-wave (CW) power — making it an ideal choice for everyday optoelectronic devices like laser pointers, optical levels, and barcode readers.
A standout feature of this diode is its built-in photodiode, which enables real-time monitoring of laser performance for consistent, stable operation. It comes packaged in a TO-18 (5.6mmφ) form factor (without window glass), balancing small size with easy integration into portable and compact devices.
Whether powering a precise laser pointer, a dependable optical level, or a fast barcode reader, the QL65D5S series combines QSI’s quality engineering, 650nm visible emission, and 5mW output to meet the needs of consumer and light industrial optoelectronic applications.
Core Specification:
| Wavelength | 650nm |
| Output Power | 5mW |
| Working Voltage | 2.2V |
| Package | TO18 5.6mm |
| Condition | Original package and brand new |
| Lifespan | > 10,000 hours |
BU-LASER has other Laser diodes from 375nm to 1064nm:
| Color | Wavelength | Power Range | Package |
| UV | 375nm | 500mW | TO5-9mm |
| UV | 380nm | 200mW | TO18-5.6mm |
| Violet | 395nm | 300mW | TO18-5.6mm |
| Violet | 405nm | 20mW-3W | TO18-5.6mm /TO5-9mm |
| Blue | 425nm | 1.5W | TO18-5.6mm |
| Blue | 435nm | 5W-7W | TO5-9mm |
| Blue | 450nm/455nm | 80mW -5.5W | TO18-5.6mm /TO5-9mm |
| Blue | 462nm/ 465nm | 1.4W- 2.8W | TO5-9mm |
| Cyan | 488nm | 55mW-300mW | TO18-5.6mm |
| Green | 515nm/520nm | 10mW-1.6W | TO18-3.8mm/TO18-5.6mm/TO5-9mm /Frame |
| Red | 635nm/638nm/642nm | 5mW-2.5W | TO18-3.8mm/TO18-5.6mm/TO5-9mm |
| Red | 650nm /658nm/660nm | 5mW-1W | TO18-3.3mm/TO18-3.8mm/TO18-5.6mm/C-mounted / Frame |
| Red | 670nm | 5mW | TO18-5.6mm |
| Infrared | 780nm/785nm | 5mW-200mW | TO18-5.6mm |
| Infrared | 808nm | 200mW-5W | TO18-5.6mm/TO5-9mm/C-mounted |
| Infrared | 830nm | 30mW-300mW | TO18-5.6mm |
| Infrared | 850nm | 5mW-2W | TO18-5.6mm |
| Infrared | 905nm | 15W-75W | TO18-5.6mm |
| Infrared | 940nm | 250mW | TO18-5.6mm |
| Infrared | 980nm | 50mW-1W | TO18-5.6mm/TO5-9mm |
| Infrared | 1064nm | 50mW | TO18-5.6mm |
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