Standard Longpass Optical Filters

These longpass edge filters are made with hard dielectric filter coatings, producing a very steep transition between passband and stopband making them far superior to absorptive colored glass filters.

Steep transition slope
High rejection stop band
High transmission pass band
Excellent temperature stability
Blocked to X-ray

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Description	Compatibility	Cut-on Wavelength	Cut-on Wavelength Tolerance	Transmittance Range	Price
10LWF-400-B Standard Longpass Filters Longpass Filter, Dielectric, 25.4 mm, 400 ± 5 nm Cut-On, 410 - 1200 nm	UNIVERSAL	400 nm	± 5 nm	410 - 1200 nm	$143
10LWF-450-B Standard Longpass Filters Longpass Filter, Dielectric, 25.4 mm, 450 ± 5 nm Cut-On, 460 - 1200 nm	UNIVERSAL	450 nm	± 5 nm	460 - 1200 nm	$143
10LWF-500-B Standard Longpass Filters Longpass Filter, Dielectric, 25.4 mm, 500 ± 5 nm Cut-On, 510 - 1200 nm	UNIVERSAL	500 nm	± 5 nm	510 - 1200 nm	$143
10LWF-550-B Standard Longpass Filters Longpass Filter, Dielectric, 25.4 mm, 550 ± 5 nm Cut-On, 560 - 1200 nm	UNIVERSAL	550 nm	± 5 nm	560 - 1200 nm	$143
10LWF-600-B Standard Longpass Filters Longpass Filter, Dielectric, 25.4 mm, 600 ± 5 nm Cut-On, 610 - 1200 nm	UNIVERSAL	600 nm	± 5 nm	610 - 1200 nm	$143
10LWF-650-B Standard Longpass Filters Longpass Filter, Dielectric, 25.4 mm, 650 ± 5 nm Cut-On, 660 - 1200 nm	UNIVERSAL	650 nm	± 5 nm	660 - 1200 nm	$143
10LWF-700-B Standard Longpass Filters Longpass Filter, Dielectric, 25.4 mm, 700 ±6 nm Cut-On, 715 - 1200 nm	UNIVERSAL	700 nm	± 6 nm	715 - 1200 nm	$143
10LWF-750-B Standard Longpass Filters Longpass Filter, Dielectric, 25.4 mm, 750 ± 6 nm Cut-On, 765 - 1200 nm	UNIVERSAL	750 nm	± 6 nm	765 - 1200 nm	$143
10LWF-800-B Standard Longpass Filters Longpass Filter, Dielectric, 25.4 mm, 800 ± 6 nm Cut-On, 815 - 1200 nm	UNIVERSAL	800 nm	± 6 nm	815 - 1200 nm	$143
10LWF-850-B Standard Longpass Filters Longpass Filter, Dielectric, 25.4 mm, 850 ± 7 nm Cut-On, 865 - 1200 nm	UNIVERSAL	850 nm	± 6 nm	865 - 1200 nm	$143

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Features

Superior Isolation Between Stopband and Passband

Our long wave pass filters feature both high transmission within the passband, and high rejection within the stop band, as well as a rapid transition, resulting in superior spectral isolation of a desired wavelength range. Out-of-band rejection for our longpass filters is OD≥3 and the stopband spans from X-ray to the edge wavelength. Typical transmission is ≥80% for our long-pass filters.

Angular Sensitivity and Fine Wavelength Tuning

Unlike colored glass filters, the filter edge wavelength for thin film filters will shift to shorter wavelengths with increased AOI. This can be useful for tilt tuning these shortpass filters to your exact wavelength. The shift may be calculated by: λ_θ = λ_o [1-(n_o/n_e)² sin²θ]^1/2 where λ_θ is the wavelength at the new angle of incidence; λ_o is the center wavelength; n_o is the index of refraction of the environment (n_o = 1 in air); n_e is the effective index of refraction of the filter; and θ is the angle of incidence. This property can be beneficial as the filters may be intentionally tilted to either stop or allow transmission of light from lasers or light sources near the edge wavelength. Our visible and IR filters have a particularly high n_e, allowing more precise wavelength tuning.

400 to 1000 nm Cut-On Wavelengths

Our longpass optical filters are available in a wide range of cut-on wavelengths, ranging from 400 to 1000 nm. A custom bandpass filter with excellent performance can be constructed using a combination of a shortpass and a longpass filter. These filters are available individually and in sets. The longpass filter set consists of one filter for each available edge wavelength. They are shipped in a hardwood box for convenient storage and protection.