SOT offers high-performance Optical Notch Filters engineered to selectively block a specific laser wavelength while allowing the rest of the spectrum to pass with minimal loss. These filters are essential in optical systems where strong suppression of an excitation wavelength is required without compromising signal throughput.
Manufactured using H-K9L optical glass and advanced thin-film coating technology, SOT notch filters provide deep rejection (OD4) at the blocked wavelength with excellent transmission elsewhere. This makes them particularly effective in Raman spectroscopy, where laser line rejection is critical, as well as in fluorescence imaging, confocal microscopy, and spectral analysis instruments.
Key Features
- High Transmittance Outside the Notch: Delivers high average transmission (Tavg > 90%) across the spectrum while selectively blocking only the target wavelength.
- Deep Reflection at Blocked Wavelength: Provides strong reflection and deep attenuation (OD4) at the notch wavelength to effectively suppress laser lines.
- Ultra-Narrow Rejection Band: Precisely rejects a very narrow spectral band, ideal for applications requiring clean spectral separation.
- Custom Laser Wavelengths Available: Supports common laser lines such as 488 nm, 532 nm, 632.8 nm, and 1064 nm, with customization available.
- Broad Scientific & Industrial Use:Optimized for Raman spectroscopy, laser-induced fluorescence, confocal and multi-photon microscopy.
Spectrum Transmission Curves
Standard spectral transmission curves are available for reference.
If catalog options do not meet your needs, custom notch filters can be designed to your exact laser wavelength, bandwidth, blocking depth, and substrate size.
Coating Quality
| Parameter | Value |
|---|---|
| Transmittance | T ≥ 95% (Customization available upon request) |
| Center Wavelength (CWL) | Typical wavelengths: 532 nm, 638 nm, 785 nm (Customization based on customer’s requirements) |
| Bandwidth (FWHM) | 10–200 nm (Customization based on customer’s requirements) |
| Optical Density (OD) | OD4, OD5, OD6 (Customization based on customer’s requirements) |
| Note | Product dimensions and other optical parameters can be customized. |
Applications
- Raman Spectroscopy – Laser line rejection for high-SNR Raman signal detection
- Laser-Based Fluorescence Instruments – Blocks excitation wavelength while passing emission
- Confocal & Multi-Photon Microscopy – Improves image contrast by eliminating unwanted light
- Spectral Analysis & Metrology – Precise wavelength isolation for accurate measurements
- Scientific & Industrial Optics – Reliable performance in demanding environments
Need a custom notch filter?
SOT combines advanced thin-film coating design, precision substrate processing, and rigorous military-grade testing to deliver notch filters with excellent spectral accuracy and long-term stability. We support both standard laser-line products and fully customized solutions for biomedical, research, and industrial systems.