Coherent’s NoiseBlock™ 90/10 Beamsplitter Filters are designed to diffract 90% of the incoming light that matches the designed Bragg wavelength (λ0) and incident angle. All other wavelengths will be transmitted through the filter, making them excellent for boosting the effective signal of a Raman spectrometer.
Adding a NoiseBlock™ 90/10 beamsplitter filter to a Raman spectrometer with a wavelength stabilized laser source can increase the recovered Raman signal by almost a factor of 4 relative to a broadband 50/50 beamsplitter. The filter’s narrow spectral profile (HWHM <10cm-1) is designed to match the SureBlock™ Ultra Narrow-band Notch Filter and NoiseBlock™ ASE Suppression Filter , making it ideal for enabling Ultra-low Frequency (Low Wavenumber) Raman Spectroscopy with high signal-to-noise.
|Center Wavelength||405||488, 514.5, 532, 633, 785, 987||nm|
|Bandwidth (FWHM)1||0.03||<0.15||nm (FWHM)|
|Total Deflection Angle (2θ)||8-12||Degrees|
|Clear Aperture Diameter||9 mm in 1″ mount. Custom sizes available.||mm|
1Grating bandwidth is a function of wavelength and thickness