Long / Short Wave Pass Filters (LWP / SWP)

  • Sharp cut filters attenuate unwanted spectral regions
  • Useful as wavelength separating beamsplitters

These filters have an edge transmission coating on the front surface. A long pass filter coating reflects shorter wavelengths and transmits longer wavelengths. A short pass filter coating reflects longer wavelengths and transmits shorter wavelengths. The rear surface is coated with a broadband anti-reflection coating. The coatings are intended for use at normal incidence but these filters can be produced for use at 45° on special request.
 

Substrate Material:
  • BK7A
  • UV Grade Fused Silica
Surface Flatness: <2 λ / inch
Surface Quality: <60 / 40
Wedge: < 3 arc min
Cut-on (cut-off) wavelength:  50% of peak transmittance
Cut-on (cut-off) Accuracy:  ± 3% of wavelength
Dimensions:
  • 25.4 mm dia (± 0.1 mm) x 1.5 mm thick
  • 50.8 mm dia ( ± 0.1 mm)  x 2.0 mm thic
Clear Aperture: > 85% of dimensions
Reflectance:  R > 99.5%
Transmission:  T > 85%, below 400 nm T > 75%
Coating:  BBAR on second side

 

To create a Lambda part number use the following :
 

 Product Type: 
 Dimension: 
 Material: 
Cut on (Cut off) Wavelength:  nm
 Part Description: 
 Price:  US Dollars

For LWP & SWP filters at 45deg AOI, please contact the Lambda Sales Team.