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Filter

Optical Filter is a device that transmits light selectively of different wavelengths. It is used as a plane glass or plastic devices in any optical path. The optical properties and features of the filter are shown by its frequency response that fuehrer demonstrates the degree and phase of each frequency component.
This selectively transmits light in a fixed range of wavelengths. It can easily pass long wavelengths, short wavelengths or band of wavelengths that blocks shorter as well as longer wavelengths. The created passband is wider or narrower and the transition between maximal and minimal transmission is sharp or gradual. This is widely used for photography in many optical instruments, scientific and technical work.  It is also used in astronomical domain for restricting light passed to the spectral band of interest. In addition, it has also become a vital part in fluorescence applications like fluorescence microscopy and spectroscopy.

Features of Filter:
  • Ideally used in clinical chemistry, life science, imaging, defense and other sectors
  • Highly durable design with hard coatings
  • Excellent optical densities with utmost performance
  • Even transmission of a part of the spectrum
Laser Line Interference Filter
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Laser Line Interference Filter
41
  • Material:Borofloat, soda lime
  • Diameter Tolerance:+0.00/-0.10mm
  • Clear Aperture:>80%
  • Thickness Tolerance:+/-0.2mm
  • Surface Quality:80-50
  • Center wavelength CWL Tolerance:+/-30nm
  • Full width-half max FWHM Tolerance:+/-30nm
  • Transmission:>80%
  • Optical Density:>3.0
  • Coating:Band pass filter 
Bandpass filter
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Bandpass filter
42
  • Bandpass filters are widely used in wireless transmitters and receivers.
  • The main function of such a filter in a transmitter is to limit the bandwidth of the output signal to the band allocated for the transmission.
  • A bandpass filter also optimizes the signal-to-noise ratio and sensitivity of a receiver.
Long pass filter
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Long pass filter
43
  • Material:Optical glass, fused silica
  • Diameter Tolerance:+0/-0.2mm
  • Thickness Tolerance:+/-0.1mm
  • Clear Aperture:80%
  • Surface Quality:40-20
  • Transmitted wavefront, P-V:Lambda/4
  • Coating type:Long pass filter
  • Surface 1:multi-layer dielectric coating
  • Surface 2:MgF2
  • Transmission:>85%
  • Cut-on Tolerance:2%
  • Cut-on Slope:3%
  • Blocking:Optical density, OD > 2
Short pass filter
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Short pass filter
44
  • Material:Optical glass, fused silica
  • Diameter Tolerance:+0/-0.2mm
  • Thickness Tolerance:+/-0.1mm
  • Clear Aperture:80%
  • Surface Quality:40-20
  • Transmitted wavefront, P-V:Lambda/4
  • Coating Type:Short pass filter
  • Surface 1:Multi-layer dielectric coating
  • Surface 2:MgF2
  • Transmission:>85%
  • Slope:90% - 10% < 10nm
  • Blocking:Optical density, OD > 4

Metal Coating Neutral Density Filter
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Metal Coating Neutral Density Filter
46
  • Material:NG1, NG4, NG9, or NG11
  • Dimension Tolerance:+0.00/-0.20mm
  • Clear Aperture:>80% of dimension
  • Parallelism:Up to 10 arc seconds
  • Surface Quality:80-50
  • Surface Flatness:< lambda/4 subject to the size
  • Transmitted Wavefront Error:< lambda/10 @ 633nm
  • Optical density Tolerance:+/-5%
  • Coating:AR coating

Neutral Density Glass Filter
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Neutral Density Glass Filter
45
  • Material :Neutral density color glass
  • Surface Quality :60-40 scratch & dig (MIL-PRF-13830B)
  • Surface flatness: 1 λ per inch @ 633 nm
  • Parallelism: 3 arcmin
  • Diameter Tolerance: +0.0/-0.2 mm
  • Clear Aperture: 90% of diameter
  • Design wavelength: 450-650 nm
  • Optical density Tolerance :+/- 5% of density