Choose from a suite of high-performance, ultra-narrowband filters and assemblies specifically designed for low-frequency THz-Raman applications.

Ultra narrowband notch filter

SureBlockTM Ultra-narrowband Notch Filters

Ondax’s SureBlock™ Ultra-Narrowband Notch Filters are the ideal solution for highly selective wavelength applications like low frequency (low wavenumber) Raman spectroscopy.
With laser line attenuation of up to 99.9999% (optical density: OD4) and transition width of <10 cm-1, SureBlock™ filters can dramatically improve the ability of any Raman system to resolve low frequency Raman scattering. Read more...

SureBlockTM XLF Ultra-narrowband Notch Filter System

Ondax’s patented SureBlock™ XLF Notch Filter Systems enable fast, clear capture of Raman spectra in the Low-Frequency (Low Wavenumber/THz regime (~5 cm-1 to 200 cm-1, or 150 GHz to 6 THz), using only a standard single-stage spectrometer. The unique ultra-narrow band design of our Notch Filters also delivers exceptionally high throughput of both Stokes and anti-Stokes shifts up to >5000cm-1 (>150 THz). Read more...
NoiseBlock ASE and Beamsplitter

NoiseBlockTM Ultra-narrowband ASE Suppression FIlters and Beamsplitters

Ondax’s NoiseBlock™ ASE (Amplified Spontaneous Emission) Suppression Filters suppress the broad spectrum of spontaneous emission that commonly occurs in laser diodes to provide a pure, ASE free, single frequency laser. NoiseBlock™ ASE filters reduce broadband spectral ASE background to more than 70dB below the laser line. Read more....
NoiseBlock™ 90/10 Beamsplitter Filters diffract 90% of the incoming light while all other wavelengths are transmitted through the filter, making them excellent for boosting the effective signal of a Raman spectrometer. Read more....
Ultra-narrowband ASE Filters and Laser Systems

CleanLineTM ASE Filter and Laser Systems

Ondax's CleanLine™ Series ASE Filter and Laser Systems are a family of tightly integrated, pre-aligned, multi-element systems designed to provide the enhanced narrow band, low noise, ASE-free laser performance required for ultra-low-frequency (low wavenumber) Raman spectroscopy, and other demanding spectroscopy or metrology applications. Read more...