Ondax’s SureBlock™ ultra narrow-band 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. High transmittance on both sides of the notch enables both Stokes and anti-Stokes Raman spectra to be observed simultaneously.
Individual filters are mounted in 1” housings for compatibility with standard 1” optical systems. Alternatively, our SureBlock™ XLF Series THz-Raman™ Spectroscopy and Filter Systems integrate the notch filters into a rugged, pre-aligned, light-tight enclosures with optional laser sources, ASE filtering, and free space or fiber inputs & outputs.
Available at standard Raman wavelengths: 488, 514, 532, 633, and 785nm. Custom wavelengths are available on demand. We also recommend the use of our NoiseBlock™ ASE Filters and 90/10 Beamsplitter Filters to achieve optimum performance of the notch filters when using diode or diode-pumped laser sources
Ondax SureBlock™ Notch filters are reflective volume holographic filters (VHGs), produced in a proprietary glass designed for long lifetime, high efficiency and excellent transmission. Ondax’s fabrication process is highly stabilized to ensure excellent part-to-part repeatability.
Ultra narrow rejection bandwidth
Highly repeatable performance
Environmentally stable at high temperature and humidity
No degradation over time, even under high power illumination conditions
Low Frequency Raman Spectroscopy
Structural Studies of Nanomaterials
Bio-medical and Solid State Laser Systems
Wide-band Notch Filter Replacement