Laser line filters are precision optical components designed to transmit a specific laser wavelength while effectively blocking unwanted light. They are essential in laser systems where high spectral purity and signal clarity are required.
Shape Optics Technologies (SOT) offers a comprehensive range of laser filters optimized for diode lasers, solid-state lasers, LEDs, and gas lasers. These filters suppress secondary emissions, plasma glow, and stray light, improving measurement accuracy while minimizing thermal load on downstream optics.
With ultra-narrow bandwidth coatings, SOT laser filters significantly enhance signal quality in demanding applications such as laser-induced fluorescence, Raman spectroscopy, and medical diagnostics.
Features
- High Peak Transmission: >80% peak transmission at the target wavelength
- Excellent Blocking Performance: Out-of-band blocking up to OD > 5.0
- Ultra-Narrow Bandwidth: Optimized for high signal-to-noise laser systems
- IBS Dielectric Coatings: Ion Beam Sputtering (IBS) technology ensures high durability and environmental stability
- Wide Application Coverage: Suitable for fluorescence, Raman, medical, analytical, and industrial laser systems
- Customizable Designs: CWL, FWHM, substrate size, and coating performance tailored to your application
Spectrum Transmission Curves
Standard transmission curves are available for common laser wavelengths. For non-standard requirements, customized spectral designs can be provided to match your exact laser wavelength, bandwidth, and blocking specifications, ensuring optimal system performance.
Coating Quality & Reliability
All coatings are tested to stringent military and industrial standards:
- Adhesion Test: MIL-C-675C compliant, no peeling or blistering
- Thermal Cycling: −62°C to +71°C with no coating degradation
- Abrasion Resistance: MIL-C-675C & CCC-C-440 compliant
- Humidity Resistance: 95–100% RH at 49°C, no defects after 24 hours
- Solvent Resistance: Acetone and alcohol exposure with no damage
- Salt Spray Test: 100 hours at 35°C, 5% salt concentration
Standard Specifications
| Item | Specification |
|---|---|
| Minimum Size | Φ2 mm or 2 × 2 mm |
| Maximum Size | Φ50 mm or 55 × 55 mm |
| Surface Quality | 80-50 |
| Laser Damage Threshold | 20 J/cm² (10 ns pulse) |
| Typical Wavelengths | 488, 532, 632.8, 808, 980, 1064 nm |
| Operating Temperature | −40°C to +60°C |
| Environmental Standard | MIL-STD-810E, Method 507.3 |
| Blocking | OD > 5 (Ruby 694 nm & YAG 1064 nm) |
| Clear Aperture | Pinhole-free |
| Compliance | MIL-Spec compliant |
Standard Products
| CWL | Peak Transmission | FWHM | Blocking |
|---|---|---|---|
| 488 nm | 85% | 20 nm | OD 4.0 |
| 532 nm | 85% | 15 nm | OD 4.0 |
| 808 nm | 85% | 10 nm | OD 4.0 |
| 1064 nm | 85% | 12 nm | OD 4.0 |
Higher blocking levels and narrower bandwidths are available upon request.
Typical Applications
- Laser-Induced Fluorescence & Imaging
- Raman Spectroscopy
- Medical & Analytical Laser Systems
- Environmental & Gas Monitoring
- Industrial & Defense Laser Systems