NoiseBlock™ ASE Noise and SureBlock™ Raman Notch Filters

NoiseBlock™ ASE filters are designed for applications where weak signals lie close to the laser line and demand a filter with the highest signal-to-noise ratio. Offered in both classic diffractive elements and compact transmissive bandpass designs, these class-leading filters deliver exceptional suppression of amplified spontaneous emission, parasitic lasing, background light or fluorescence while preserving laser line transmission. Applications include:
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• Low-Frequency / THz Raman Spectroscopy – resolve signals just a few cm⁻¹ from the laser line

• Quantum Optics & Single-Photon Sources – eliminate noise photons that degrade entanglement and purity

• High-Resolution & Nonlinear Spectroscopy – maintain spectral clarity for pump–probe and cavity-enhanced studies

• LIDAR & Remote Sensing – boost sensitivity in coherent and DIAL systems

• Biomedical & Imaging Applications – improve contrast in OCT, FLIM, and fluorescence detection

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Pair with the NoiseBlock™ Beamsplitter, which efficiently couples the laser source into the optical path while maintaining high transmission near the laser line.
 
SureBlock™ Ultra Narrow-Band Notch Filter deliver industry-leading laser line blocking for highly selective wavelength applications such as low-frequency Raman spectroscopy, far surpassing thin-film alternatives. Our patented design enhances both performance and ease of integration into instrumentation. Combined with NoiseBlock™ ASE filters and beamsplitters, they create a complete, high-performance solution for ultra-low-frequency Raman measurements.