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Ultra narrow rejection bandwidth for Low Frequency Raman Spectroscopy
Ultra narrow-band notch filters, SureBlock

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Ondax incorporated
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SureBlock Notch filters are reflective volume holographic filters (VHGs), produced in a proprietary glass designed for long lifetime, high efficiency and excellent transmission. This fabrication process is highly stabilized to ensure excellent part-to-part repeatability. SureBlock filter are the ideal solution for highly selective wavelength applications like low frequency 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. Available at standard Raman wavelengths: 488, 514, 532, 633, and 785nm. Custom wavelengths are available on demand. - Highly repeatable performance, - Environmentally stable at high temperature and humidity, - No degradation over time, even under high power illumination conditions,
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