Biomedical · narrow · broad

Custom Bandpass Filters

Tower's custom filters cover biomedical, narrow-band, and broadband applications. Using ion-beam sputtering with volume manufacturing, we deliver cost-effective filters with tight CWL and FWHM control, high transmission, and deep blocking. Biomedical: 340–766 nm, CWL ±2 nm, FWHM 8–10 nm, OD4 rejection. Narrow: 340–1570 nm, FWHM 2–50 nm, OD4/OD6. Broad: FWHM ~50 nm, OD3/OD4.

Specifications

Biomedical range

340–766 nm

CWL tolerance

±0.4–2 nm

FWHM

2–50 nm (8–10 nm typical biomedical)

Transmission

> 50–90% depending on type

Blocking

300–1200 / 300–1800 nm

Rejection

OD 3 to OD 6+

Process

Ion-beam sputtering