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Notch filters, also commonly referred to as band-stop or band-rejection filters, are designed to transmit most wavelengths with little intensity loss while attenuating light within a specific wavelength range (the stop band) to a very low level.
Notch filters are useful in applications where one needs to block light from a laser. For instance, to obtain good signal-to-noise ratios in Raman spectroscopy experiments, it is critical that light from the pump laser be blocked. This is achieved by placing a notch filter in the detection channel of the setup. In addition to spectroscopy, notch filters are commonly used in laser-based fluorescence instrumentation and biomedical laser systems.
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Right angle prism, 25 mm
Potassium bromide window, (45 mm dia. x 3 mm thick)
Dielectric Beam Splitter, dia 100 mm, thick 15 mm
Plano Concave Spherical Lens, Dia 50.8 mm, Focal Length -500 mm
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