Key Features
- High Transmission: Multi-channel optical filters from SOT deliver excellent transmission efficiency at each designated wavelength channel, maximizing usable signal strength.
- Efficient & Deep Blocking: Advanced thin-film designs provide deep out-of-band blocking across a broad spectral range, minimizing cross-talk and unwanted spectral interference.
- Narrow FWHM: Carefully controlled narrow Full Width at Half Maximum (FWHM) enables precise wavelength discrimination for high-accuracy spectral measurements.
- Sharp Spectral Slopes: Steep transition edges between passbands and stopbands ensure clean channel separation and high signal integrity.
- High Versatility: Suitable for military, aerospace, biomedical instrumentation, fluorescence systems, spectral analysis, and high-precision optical platforms.
General Description
Shape Optics Technologies (SOT) manufactures high-performance multiple-channel optical filters using advanced optical thin-film coating technologies. These filters are engineered for applications that demand high spectral precision, low error tolerance, and long-term stability.
SOT multi-channel filters are widely used in biomedical and fluorescence instruments, enabling accurate separation of multiple signal channels within a single optical element. By combining high transmission, deep blocking, narrow FWHM, and sharp slopes, these filters ensure reliable wavelength isolation in highly sensitive detection systems.
Available designs include dual-channel, triple-channel, and four-channel filters, supporting complex optical architectures where multiple wavelengths must be detected simultaneously. These solutions are also deployed in military and aerospace systems, where precise spectral data acquisition is mission-critical. Custom designs are available to meet application-specific wavelength, blocking, and angular requirements.
Spectrum Transmission Curves & Customization
Standard spectral transmission curves are available for reference.
If standard configurations are not suitable, custom multi-channel filters can be designed based on:
- Target wavelengths and channel spacing
- Blocking range and optical density (OD)
- FWHM and slope requirements
- Substrate material and flatness
Contact us to discuss custom designs tailored to your application.
Coating Quality & Reliability Testing
All SOT multiple-channel filters undergo stringent environmental and durability testing in accordance with MIL-C-675C standards:
- Adhesion Test: LT-90 tape test, three removals; no blistering or peeling
- Temperature Cycling: −62 ± 1 °C to 71 ± 1 °C; no film detachment
- Abrasion Resistance: 1.0 lb gauze test, 25 cycles; no surface damage
- Humidity Resistance: 49 ± 2 °C at 95–100% RH for 24 hours; film intact
- Solvent & Cleaning: Acetone and alcohol exposure; no peeling or scratches
- Salt Spray: 100 hours at 35 °C with 5% NaCl; excellent corrosion resistance
Standard Specifications
- Wavelength Range: Customizable based on application
- Transmission: High transmission at selected wavelengths
- Blocking Efficiency: Deep blocking outside passbands
- FWHM: Narrow bandwidth for high spectral precision
- Slope: Sharp transition between passband and blockband
- Material: Optical glass, multiple coating options
- Flatness: 1/2 λ
- Parallelism: < 3′
Applications
Multiple-channel optical filters are ideal for applications requiring precise wavelength separation and multi-signal detection, including:
- Military Systems – Detection, spectral sensing, and signal discrimination
- Aerospace & Remote Sensing – Atmospheric spectroscopy and sensor payloads
- Biomedical Instruments – Fluorescence diagnostics and multi-channel detection
- Spectral Analysis – Laboratory and field-based scientific research
- High-Precision Optical Systems – Laser systems, metrology, and instrumentation
SOT Strengths & Capabilities
SOT combines deep expertise in optical coating design, state-of-the-art manufacturing, and rigorous quality control to deliver reliable multi-channel optical filters for the most demanding environments. Our ability to custom-engineer dual-, triple-, and multi-band filters ensures each solution meets the exact optical and mechanical requirements of our customers.
Standard Multi-Channel Products
| Product Type | CWL (nm) | Tavg (%) | FWHM (nm) | Blocking |
|---|---|---|---|---|
| Dual-Channel Filter | 808, 850 | 95 | 20 / 20 | OD > 200–1100 nm |
| Triple-Channel Filter | 465, 546, 645 | 95 | 35 / 30 / 55 | OD > 645–520 nm & 670–600 nm |
| Four-Channel Filter | 465, 646, 645, 720 | 93 | 26 / 50 / 73 / 135 | OD > 456–560 nm & 564–542 nm |
Customization options are available upon request.