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Transmittive long pass filter
 
 

The long pass absorption filter is designed to remove short wavelength light (e.g. residual pump light) from a longer wavelength laser signal.
Our long pass filters use an epitaxial semiconductor absorber layer on a semi-insulating GaAs crystal. This wafer material can be diced in small rectangular chips according to the customer needs. The short wavelength light is absorbed in the filter and subsequently converted into heat. For heat removal an appropriate metal mount as heatsink has to be used.

Long pass filters
 
We provide unmounted long pass filters with a standard substrate thickness of 625 Ám
 
Available chip areas:
  • 5.0 mm x 5.0 mm
  • 4.0 mm x 4.0 mm
  • 2.0 mm x 2.0 mm
  • custom dimensions on request
 
Long pass filter with cut-off wavelength 900 nm from stock  
 
 
Part No. Delivery time Description Data
PDF
Ouote Price
EUR
LPF-900-5x5 1 week Long Pass Filter 900 nm on GaAs substrate
stopband λ < 880 nm, passband λ > 950 nm
chip area: 5.0 mm x 5.0 mm, chip thickness 0.625 mm
PDF Data Quote 70
LPF-900-4x4 1 week Long Pass Filter 900 nm on GaAs substrate
stopband λ < 880 nm, passband λ > 950 nm
chip area: 4.0 mm x 4.0 mm, chip thickness 0.625 mm
PDF Data Quote 60
LPF-900-2x2 1 week Long Pass Filter 900 nm on GaAs substrate
stopband λ < 880 nm, passband λ > 950 nm
chip area: 2.0 mm x 2.0 mm, chip thickness 0.625 mm
PDF Data Quote 50
 
 
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BATOP GmbH