Case Study: 2550nm Short Pass Filter

Data Table

Specification

Value

50% T%

2550 nm +/- 20

Transmission Range

1300 – 2500 nm

Blocking Range

2600 – 6000 nm

Peak Transmission %

T% >80%

Substrate

Sapphire

Dimensions

15 mm Dia

Thickness

0.5 mm

Scratch/Dig

60/40

Quantity Per Year

300

Case Study: Short Wave Pass Filter to Block Unwanted Sensitivity of a Lead Sulphide (PbS) Detector

 

This short-wave pass was designed for a customer who wanted to block the tail end sensitivity of a lead sulphide detector. Lead sulphide detectors have a sensitivity range of 1000-3000 nm and the customer wanted to avoid signal being received by the detector above 2650 nm, so we supplied the filter of Fig 1 above to block this short range of 2600 – 3000 nm whilst maintaining a high transmission level above 80% from 1300 – 2500 nm. Short pass filters are an excellent option for “trimming” or “blocking” the longer wavelengths and can be fitted to LED’s, Light Sources and detectors to avoid unwanted radiation and the associated ‘false positive’ results.