Northumbria Optical Coatings Ltd

Short Wave Pass

Short wave pass filters are distinguished by a sharp transition from a zone of transmission to a zone of rejection. The rejection region typically extends to the far infrared but can be limited for filters with edge positions below 2um. When ordering it is necessary to specify the 5% or 50% cut off edge position (the 5% point is measured as an absolute value but the 50% point is measured as 50% of peak transmittance).

Typical Performance


Typical Characteristics

Available wavelength range (edge position) ~1.8 to 20 um
Edge tolerance To customers requirements, from +/-1% but standard tolerance +/-4%
Average transmittance Typically >75% (depending on wavelength)
Cut on slope Typically < 5%
Blocking (attenuation) Typically <0.1% to 0.3 micron.

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