Optical Filters

CUSTOM FILTERS

Tower custom filters cover applications for biomedical bandpass, narrow bandpass, broad bandpass or long pass. Using ion-beam sputtering together with volume manufacturing methods, Tower is able to offer cost-effective solutions.

Biomedical Filters

From: 340 nm to 766 nm
Size: as required
CWL tolerance: ±2 nm
FWHM: 8-10 nm, typical
FWHM Tolerance: ±1 nm
Transmission: >50%
Blocking: 300 nm – 1200 nm
Rejection: OD=4, 0.01% or 10-4

Narrow Bandpass

From: 340 nm to 1570 nm
Size: as required
CWL tolerance: 0.4 nm – 2 nm
FWHM: 2 nm – 50 nm
Transmission: >90%
Blocking: 300 nm – 1200 nm, 300 nm – 1800 nm
Rejection: OD>4, OD>6

Broad Bandpass

From: 340 nm to 1570 nm
Size: as required
CWL tolerance: >10 nm
FWHM: 50 nm
Transmission: >70%*
Blocking: 300 nm – 1200 nm, 300 nm – 1800 nm
Rejection: OD>3, OD>4
* Specify desired level

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