Applications such as Raman spectroscopy often require that certain frequencies within a narrow range be attenuated. To hone in on the frequency to be blocked requires a precise optical filter with steep edges. Iridian fabricates non-holographic notch and multiple notch filters that eliminate the need for multiple filters for spectral noise reduction.
The following is a summary of Iridian's notch filter offerings for the Raman spectroscopy application:
Notch Wavelength
(nm) |
FWHM (nm)
Standard Notch |
FWHM (nm)
Narrow Notch |
442 |
11 |
10 |
457 |
12 |
10 |
476 |
13 |
10 |
488 |
14 |
10 |
514.5 |
16 |
12 |
532 |
17 |
12 |
632.8 |
25 |
16 |
650 |
26 |
17 |
676 |
29 |
17 |
752 |
36 |
19 |
785 |
39 |
20 |
830 |
44 |
21 |
1064 |
71 |
36 |
Iridian Notch Filters Advantage:
Iridian’s notch and multiple notch filters are among the narrowest dielectric thin film notch filters on the market, with blocking greater than OD6. They offer superior reliability and affordability compared to holographic notch filters. Like all Iridian filters, our notch filters use hard dielectric coatings and do not require cover glass for durability, which greatly improves transmission levels in comparison to traditional filters.
Please contact us for individual filter specifications.
