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Notch Filters

Notch Filters

OD 6.0 Notch Filters are designed to block specific laser wavelengths. While these optical filters reject a very narrow wavelength range (FWHM ±15-20 nm), they feature broad transmission ranges (pass bands). Custom Notch filters available on request.

495 $
delivery Estimated delivery time: 4 - 5 days
Products
Specifications
Description
Code Optical Density Size Center wavelength Pass Bands FWHM Price Delivery Add to cart
i 246-2506-488 6.0 ø 25.4 x 6 mm 488 nm 400-471 + 504-700 nm 15 nm 495 $ 4 - 5 days
i 246-2506-514 6.0 ø 25.4 x 6 mm 514 nm 400-496 + 532-700 nm 17 nm 495 $ 4 - 5 days
i 246-2506-532 6.0 ø 25.4 x 6 mm 532 nm 400-517 + 548-710 nm 17 nm 495 $ 4 - 5 days
i 246-2506-561 6.0 ø 25.4 x 6 mm 561 nm 425-542 + 580-740 nm 19 nm 495 $ 4 - 5 days
Material UV FS
Clear Aperture ⌀22 mm
Surface Quality 40 - 20 scratch & dig (MIL-PRF-13830B)
Surface Flatness better than λ/2 @ 633 nm
Coating S1: hard dielectric filter coating
S2: BBAR coating
Optical Density OD>6 at central wavelength ±2 nm
Transmission at Passbands Taverage>90%
Laser Damage Threshold >1 J/cm2 10 ns, 10 Hz at rejected wavelength

Notch filters, or stop-band filters, are designed to block a specific narrow wavelength range (stop band) and to transmit broad wavelength ranges outside of this band (pass bands). These optical filters feature high optical density (OD), which is a logarithmic measurement of the percent transmission (T%):
OD = log10 1T%. OD is specified for the center wavelength of the stop band.

EKSMA Optics Notch filters feature OD 6.0 (transmission less than 0.0001%) that ensures effective blocking of the designated laser wavelength. The back side of the filter is anti-reflection coated at pass band regions to minimize the reflection.

The spectral characteristics of Notch filters strongly depend on the angle of incidence (AOI). We specify OD for the design wavelength at 0° AOI. As angle of incidence increases, the stop band shifts to shorter wavelengths. We provide transmission curves for different AOI values (0°, 22.5°, 45°) for each of our standard Notch filters.

Thin-film notch filters, or rejection filters, can be used for numerous applications, where some specific laser wavelengths need to be blocked, while others have to be transmitted. They are commonly used in Raman spectroscopy, medical laser systems, laser safety applications and laser-based fluorescence instruments.