Longpass Filter


Longpass filter has the advantages of wide cut-off band, deep cut-off depth, high conversion steepness and high transmittance. It can be widely used in fluorescence excitation spectroscopy measurement, Raman spectroscopy application, spectral grouping application, and astronomical observation application, etc. It can also be widely used in imaging optical system, machine vision system application, used to eliminate the interference light beyond the available band, greatly improve the imaging clarity, as well as the sensitivity of the system.

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Longpass filter has the advantages of wide cut-off band, deep cut-off depth, high conversion steepness and high transmittance. It can be widely used in fluorescence excitation spectroscopy measurement, Raman spectroscopy application, spectral grouping application, and astronomical observation application, etc. It can also be widely used in imaging optical system, machine vision system application, used to eliminate the interference light beyond the available band, greatly improve the imaging clarity, as well as the sensitivity of the system.



Products Description



Longpass Filters refer to those in a specific wavelength range in which the direction of the long wave is passed through while the direction of the short wave is cut off,
so as to isolate the short wave and pass through the long wave.



Material:                                          
 Fused silica, N-BK7, H-K9L, B270, Float glass,etc.
CWL Tolerance:  +/-1%
Cut-off depth:
 OD2-OD8
Parallel:  <30 arc second
Transmittance  90%
Clear aperture:
 90%
Bevel:
 0.2mmX45° Protective bevel    
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