the World's Only 785nm 40mW COS Diode Laser
Features：
- COS (Chip on Submount) package for compact integration
- High stability and reliability
- Wavelength: 785 nm
- Output Power: 40 mW
- Single Mode
Applications：
- Raman spectroscopy
- Biomedical and fluorescence analysis
- Optical instrumentation
- Scientific research and R&D projects
I'd like to share with you our 785nm 40mW COS Diode Laser - it's actually the only one of its kind available worldwide. It comes in a compact COS package, offers stable performance, and has very good beam quality. This makes it easy to integrate and reliable for use in applications like Raman spectroscopy, biomedical analysis, fluorescence detection, precision measurement, optical sensing, and other research work.
What is single-mode COS?
COS stands for Chip on Submount, referring to the configuration where the laser chip is mounted directly onto a substrate. This is a common packaging method for diode lasers. It involves mounting the laser chip directly onto a heat-dissipating and supporting substrate, facilitating subsequent integration into more complex modules or systems.
Single-Mode COS means:
The laser chip operates in a single transverse/longitudinal mode, producing a beam spot with a near-Gaussian distribution.
It offers superior beam quality with an M² value approaching 1.
Featuring a narrow spectral linewidth, it suits applications requiring high precision and low noise.
Output power is typically lower than multimode variants, but the beam is cleaner with superior focusing performance.
Simply put:
Single-mode COS → High beam quality, narrow linewidth, suitable for research and precision applications.
Multi-mode COS → Higher power output, but generally lower beam quality.
Single Mode COS vs. Multi Mode COS:
| Feature | Single Mode COS | Multi Mode COS |
|---|---|---|
| Beam Quality | Excellent, near-Gaussian profile | Lower, beam divergence is larger |
| M² Value | Close to 1 (high beam quality) | Higher M², less focusable |
| Spectral Linewidth |
|
Broader linewidth |
| Output Power | Relatively lower | Higher output power available |
| Applications | Raman spectroscopy, sensing, biomedical analysis, precision measurement, scientific research | Material processing, illumination, pumping, applications needing higher power but not strict on beam quality |
| Applications |
|
More suitable for multimode fiber coupling |
Our 785nm 40mW COS Diode Laser is a single-mode COS laser, meaning it provides a clean, high-quality beam with a narrow spectral linewidth and excellent stability. The compact COS package makes it easy to integrate into systems, while maintaining reliable performance. Compared to multi-mode lasers, it offers superior beam quality and precision, making it ideal for applications such as Raman spectroscopy, biomedical and fluorescence analysis, precision measurement, optical sensing, and other research work.
Data Sheet:
Item No.: COS795SM004
Item Name：795nm 40mW COS Diode Laser
| Optical | |
| Center Wavelength | 795nm |
| Output Power | 40mW |
| Linewidth | 1MHz |
| Far Field Divergence FWHM | 30Deg |
| Side Moe Suppression Ratio | 35dB |
| Electrical | |
| Threshold Current Lth | 50mA |
| Operating Current Lop | 150mA |
| Operating Voltage Vop | 2V |
| Thermal | |
| Test Temperature | 25℃ |
| Storage Temperature | -30~70℃ |
Drawing：
