SLM, narrow linewidth, coherence
MSL-III-638L638 nm red single-frequency laser
638 nmThe MSL-III-638L is a 638 nm continuous-wave direct diode laser. Electrical current creates optical gain in a semiconductor junction, and the diode generates the laser light directly. Optical feedback selects the oscillating modes, while drive current and junction temperature affect output power and wavelength. Single-longitudinal-mode operation selects one resonator frequency. Linewidth describes the spread around that frequency, while frequency drift describes how its center moves over time. This distinction matters when matching the source to a narrow resonance or an interferometer.
Specifications
MSL-III-638L
20 specification rows
| Output / average power | 1~40 mW |
|---|---|
| Beam / notes | Spectral linewidth <100 MHz |
| Operating mode | CW |
| Power stability (rms, 4 hours ± 3°C) | <2%, <1%, <0.5% |
| Transverse mode | Near TEM00 |
| Longitudinal mode | Single |
| Spectral line width (MHz) | <100, (<50 optional) |
| Noise of amplitude (rms, 20Hz-20MHz) | <1%, <0.5% |
| M2 | <1.5 |
| Beam divergence, full angle (mrad) | <1.2 |
| Warm-up time (minutes) | <5 |
| Operating temperature (℃) | 10-35 |
| Power supply (100-240VAC) | PSU-III-FDA |
| Expected lifetime (hours) | >10000 |
| Central wavelength (nm) | 638±0.5 |
| Coherent length (m) | >2 |
| M² | <1.5 |
| Beam diameter at the aperture (1/e2, mm) | <3 |
| Polarization ratio | >50:1, (>100:1 optional) Horizontal±5 degree (Vertical optional) |
| Beam height from base plate (mm) | 24.8 |
What do you need?
Tell us the output power, linewidth and beam delivery you need, and we'll reply with the matching configuration and lead time.
Model selection
Nearby series comparison
Compare MSL-III-638L with the closest available models in the Single-Frequency Lasers family.
| Selection parameter | MSL-III-638L (current) | 638 | Narrow Linewidth |
|---|---|---|---|
| Wavelength | 638 nm | 638 nm | 637 nm |
| Optical power / pulse energy | 1~40 mW | 1~40 mW | 1-50 mW |
| Operating mode / pulse width | CW | — | — |
| Beam quality | <1.5 | <1.5 | — |
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