High Performance Colored Glass Alternative Longpass Filters

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12.7 mm dimater colored glass alternative optical filter

Overview

Our colored glass alternative long-pass edge filters are a great alternative to standard colored glass filters. Using Newport's patented Stabilife® coating technology, many layers of refractory metal oxide film are deposited under vacuum in a precise sequence, defining the spectral signature of the filters. Unlike Colored-Glass filters which rely upon absorption to create the filter's spectral response, CGA filters utilize optical interference phenomena to create wide bands of very-high reflectance to create the blocking region of the filters, and wide bands of very-low reflectance to create the transmission bands of the filters.

Steep transitions from blocking to transmission
Low autofluorescence
High transmission of >90% average (typical)
Excellent blocking of >5 OD
Patented Stabilife® coatings
Wavelength stability in any environment

See All Features

Products

Compare	Model	Compatibility	rankScore	Optic Size	Cut-on Wavelength	Cut-on Wavelength Tolerance	Effective Index of Refraction	Availability	Price	Brand
10CGA-1000 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 1000 nm Cut-on $47 Contact Us	10CGA-1000 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 1000 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	1000 nm	±9 nm	1.76	Contact Us	$47	Newport
10CGA-305 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 305 nm Cut-on $47 In Stock	10CGA-305 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 305 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	305 nm	±5 nm	2.35	In Stock	$47	Newport
10CGA-320 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 320nm Cut-on $47 In Stock	10CGA-320 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 320nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	320 nm	±5 nm	2.22	In Stock	$47	Newport
10CGA-335 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 335 nm Cut-on $47 In Stock	10CGA-335 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 335 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	335 nm	±5 nm	2.18	In Stock	$47	Newport
10CGA-345 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 345 nm Cut-on $47 In Stock	10CGA-345 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 345 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	345 nm	±5 nm	1.98	In Stock	$47	Newport
10CGA-360 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 360 nm Cut-on $47 In Stock	10CGA-360 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 360 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	360 nm	±5 nm	2.26	In Stock	$47	Newport
10CGA-375 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 375 nm Cut-on $47 In Stock	10CGA-375 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 375 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	375 nm	±5 nm	1.77	In Stock	$47	Newport
10CGA-385 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 385 nm Cut-on $47 In Stock	10CGA-385 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 385 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	385 nm	±5 nm	1.75	In Stock	$47	Newport
10CGA-395 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 395 nm Cut-on $47 In Stock	10CGA-395 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 395 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	395 nm	±5 nm	1.29	In Stock	$47	Newport
10CGA-400 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 400 nm Cut-on $47 In Stock	10CGA-400 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 400 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	400 nm	±5 nm	1.83	In Stock	$47	Newport
10CGA-420 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 420 nm Cut-on $47 2 Weeks	10CGA-420 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 420 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	420 nm	±5 nm	1.86	2 Weeks	$47	Newport
10CGA-435 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 435 nm Cut-on $47 In Stock	10CGA-435 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 435 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	435 nm	±5 nm	1.9	In Stock	$47	Newport
10CGA-455 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 455 nm Cut-on $47 In Stock	10CGA-455 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 455 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	455 nm	±5 nm	1.95	In Stock	$47	Newport
10CGA-475 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 475 nm Cut-on $47 In Stock	10CGA-475 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 475 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	475 nm	±5 nm	1.41	In Stock	$47	Newport
10CGA-495 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 495 nm Cut-on $47 In Stock	10CGA-495 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 495 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	495 nm	±5 nm	1.76	In Stock	$47	Newport
10CGA-515 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 515 nm Cut-on $47 In Stock	10CGA-515 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 515 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	515 nm	±5 nm	1.81	In Stock	$47	Newport
10CGA-530 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 530 nm Cut-on $47 In Stock	10CGA-530 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 530 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	530 nm	±5 nm	1.84	In Stock	$47	Newport
10CGA-550 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 550 nm Cut-on $47 In Stock	10CGA-550 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 550 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	550 nm	±5 nm	1.77	In Stock	$47	Newport
10CGA-570 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 570 nm Cut-on $47 2 Weeks	10CGA-570 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 570 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	570 nm	±5 nm	1.76	2 Weeks	$47	Newport
10CGA-590 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 590 nm Cut-on $47 In Stock	10CGA-590 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 590 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	590 nm	±5 nm	1.75	In Stock	$47	Newport
10CGA-610 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 610 nm Cut-on $47 In Stock	10CGA-610 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 610 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	610 nm	±6 nm	1.79	In Stock	$47	Newport
10CGA-630 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 630 nm Cut-on $47 In Stock	10CGA-630 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 630 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	630 nm	±6 nm	1.74	In Stock	$47	Newport
10CGA-645 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 645 nm Cut-on $47 In Stock	10CGA-645 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 645 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	645 nm	±6 nm	1.78	In Stock	$47	Newport
10CGA-665 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 665 nm Cut-on $47 In Stock	10CGA-665 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 665 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	665 nm	±6 nm	1.81	In Stock	$47	Newport
10CGA-695 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 695 nm Cut-on $47 In Stock	10CGA-695 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 695 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	695 nm	±6 nm	1.74	In Stock	$47	Newport
10CGA-715 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 715 nm Cut-on $47 In Stock	10CGA-715 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 715 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	715 nm	±7 nm	1.7	In Stock	$47	Newport
10CGA-760 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 760 nm Cut-on $47 In Stock	10CGA-760 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 760 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	760 nm	±7 nm	1.72	In Stock	$47	Newport
10CGA-780 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 780 nm Cut-on $47 In Stock	10CGA-780 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 780 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	780 nm	±7 nm	1.74	In Stock	$47	Newport
10CGA-800 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 800 nm Cut-on $47 In Stock	10CGA-800 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 800 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	800 nm	±8 nm	1.73	In Stock	$47	Newport
10CGA-830 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 830 nm Cut-on $47 Contact Us	10CGA-830 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 830 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	830 nm	±8 nm	1.79	Contact Us	$47	Newport
10CGA-850 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 850 nm Cut-on $47 In Stock	10CGA-850 Longpass Filter, Colored-Glass Alternative, 25.4 mm, 850 nm Cut-on	UNIVERSAL	1.0	Ø25.4 mm	850 nm	±8 nm	1.8	In Stock	$47	Newport
5CGA-1000 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 1000nm Cut-on $40 In Stock	5CGA-1000 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 1000nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	1000 nm	±9 nm	1.76	In Stock	$40	Newport
5CGA-305 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 305 nm Cut-on $38 In Stock	5CGA-305 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 305 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	305 nm	±5 nm	2.35	In Stock	$38	Newport
5CGA-320 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 320nm Cut-on $38 In Stock	5CGA-320 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 320nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	320 nm	±5 nm	2.22	In Stock	$38	Newport
5CGA-335 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 335 nm Cut-on $38 In Stock	5CGA-335 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 335 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	335 nm	±5 nm	2.18	In Stock	$38	Newport
5CGA-345 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 345 nm Cut-on $38 In Stock	5CGA-345 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 345 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	345 nm	±5 nm	1.98	In Stock	$38	Newport
5CGA-360 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 360 nm Cut-on $38 In Stock	5CGA-360 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 360 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	360 nm	±5 nm	2.26	In Stock	$38	Newport
5CGA-375 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 375 nm Cut-on $38 In Stock	5CGA-375 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 375 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	375 nm	±5 nm	1.77	In Stock	$38	Newport
5CGA-385 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 385 nm Cut-on $38 In Stock	5CGA-385 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 385 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	385 nm	±5 nm	1.75	In Stock	$38	Newport
5CGA-395 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 395 nm Cut-on $38 In Stock	5CGA-395 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 395 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	395 nm	±5 nm	1.29	In Stock	$38	Newport
5CGA-400 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 400 nm Cut-on $38 In Stock	5CGA-400 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 400 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	400 nm	±5 nm	1.83	In Stock	$38	Newport
5CGA-420 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 420 nm Cut-on $38 In Stock	5CGA-420 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 420 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	420 nm	±5 nm	1.86	In Stock	$38	Newport
5CGA-435 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 435 nm Cut-on $38 In Stock	5CGA-435 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 435 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	435 nm	±5 nm	1.9	In Stock	$38	Newport
5CGA-455 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 455 nm Cut-on $38 In Stock	5CGA-455 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 455 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	455 nm	±5 nm	1.95	In Stock	$38	Newport
5CGA-475 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 475 nm Cut-on $38 In Stock	5CGA-475 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 475 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	475 nm	±5 nm	1.41	In Stock	$38	Newport
5CGA-495 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 495 nm Cut-on $38 Show	5CGA-495 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 495 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	495 nm	±5 nm	1.76	Show	$38	Newport
5CGA-515 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 515 nm Cut-on $38 In Stock	5CGA-515 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 515 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	515 nm	±5 nm	1.81	In Stock	$38	Newport
5CGA-530 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 530 nm Cut-on $38 In Stock	5CGA-530 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 530 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	530 nm	±5 nm	1.84	In Stock	$38	Newport
5CGA-550 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 550 nm Cut-on $38 In Stock	5CGA-550 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 550 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	550 nm	±5 nm	1.77	In Stock	$38	Newport
5CGA-570 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 570 nm Cut-on $38 In Stock	5CGA-570 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 570 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	570 nm	±5 nm	1.76	In Stock	$38	Newport
5CGA-590 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 590 nm Cut-on $38 In Stock	5CGA-590 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 590 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	590 nm	±5 nm	1.75	In Stock	$38	Newport
5CGA-610 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 610 nm Cut-on $38 In Stock	5CGA-610 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 610 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	610 nm	±6 nm	1.79	In Stock	$38	Newport
5CGA-630 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 630 nm Cut-on $38 1 Week	5CGA-630 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 630 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	630 nm	±6 nm	1.74	1 Week	$38	Newport
5CGA-645 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 645 nm Cut-on $38 In Stock	5CGA-645 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 645 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	645 nm	±6 nm	1.78	In Stock	$38	Newport
5CGA-665 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 665 nm Cut-on $38 In Stock	5CGA-665 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 665 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	665 nm	±6 nm	1.81	In Stock	$38	Newport
5CGA-695 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 695 nm Cut-on $38 In Stock	5CGA-695 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 695 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	695 nm	±6 nm	1.74	In Stock	$38	Newport
5CGA-715 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 715 nm Cut-on $38 2 Weeks	5CGA-715 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 715 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	715 nm	±7 nm	1.7	2 Weeks	$38	Newport
5CGA-760 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 760 nm Cut-on $38 In Stock	5CGA-760 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 760 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	760 nm	±7 nm	1.72	In Stock	$38	Newport
5CGA-780 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 780 nm Cut-on $38 In Stock	5CGA-780 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 780 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	780 nm	±7 nm	1.74	In Stock	$38	Newport
5CGA-800 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 800 nm Cut-on $38 In Stock	5CGA-800 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 800 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	800 nm	±8 nm	1.73	In Stock	$38	Newport
5CGA-830 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 830 nm Cut-on $38 In Stock	5CGA-830 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 830 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	830 nm	±8 nm	1.79	In Stock	$38	Newport
5CGA-850 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 850 nm Cut-on $38 4 Weeks	5CGA-850 Longpass Filter, Colored-Glass Alternative, 12.7 mm, 850 nm Cut-on	UNIVERSAL	1.0	Ø12.7 mm	850 nm	±8 nm	1.8	4 Weeks	$38	Newport

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Notes:

CGA filters are also available in Square shape.

Specifications

Type

Colored-Glass Alternative Longpass Filter
Transmission

≥ 90% average (typical)
Surface Quality

80-50 scratch-dig
Thickness

1.1 mm
Thickness Tolerance

±0.1 mm

Clear Aperture

≥90% of filter size with film to the edge
Temperature Range

-100 to 400 º C
Humidity Resistance

MIL-STD-810, Method 507.3, Procedure III, Modified to 40 cycles
Abrasion, Adhesion, Hardness

MIL-C-48497
Cleaning

Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended

Specifications

Type

Colored-Glass Alternative Longpass Filter
Transmission

≥ 90% average (typical)
Surface Quality

80-50 scratch-dig
Thickness

1.1 mm
Thickness Tolerance

±0.1 mm

Clear Aperture

≥90% of filter size with film to the edge
Temperature Range

-100 to 400 º C
Humidity Resistance

MIL-STD-810, Method 507.3, Procedure III, Modified to 40 cycles
Abrasion, Adhesion, Hardness

MIL-C-48497
Cleaning

Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended

Features

Angle of Incidence Effects

The cut-on wavelength of Newport Stabilife™ Colored-Glass Alternative filters will slightly shift lower in wavelength with an increase in the angle of incident collimated light. The amount of wavelength shift is dependent upon the incident angle and the effective index (ne) of the filter. This feature can be very useful in research applications by being able to custom tune a CGA filter to a specific desired wavelength. The following formula may be used to determine the wavelength shift of a filter in random polarized collimated light:
λ_θ = λ_o [1-(n_o/n_e)² sin²θ]^1/2
where
λ_θ = Cut-on wavelength at θ° angle of incidence
λ_o = Cut-on wavelength at 0° angle of incidence
θ = Angle of incident light off normal incidence
n_o = Effective index of refraction of the environment (n_o = 1 in air)
n_e = Effective index of refraction of the optic; specified as a numerical value derived from the indices of the thin film layers of the CGA filter

specified as a numerical value derived from the indices of the thin film layers of the CGA filter

Cone-Angle Effects

In some applications, the incident light is presented at the filter in a convergent or divergent cone. The cone is made up of many light rays at various angles ranging from normal incidence to the extreme angle defining the full cone. The effect of this collection of rays is a weighted average of incident light, producing a wavelength shift toward shorter wavelengths that is smaller than the shift that would be produced if collimated light was presented to the filter at the extreme angle of the full cone.

Stain Resistance

CGA filters have been evaluated for stain resistance using the Acid Resistance test set forth in ISO 8424. This test is used to determine the surface change that results from exposure to a strong acidic substance. The surface is exposed to a Nitric Acid solution (0.5M/l) having a pH of 0.3 ± 0.05. Testing is conducted to determine the amount of time needed to etch into the surface to a depth of 0.1 µm. Newport's CGA filters have been confirmed to meet an SR1 rating which corresponds to greater than 100 hours of exposure. Since CGA filters are constructed of very thin layers of vacuum-deposited thin-film coating, an etch depth of 0.1 µm would likely result in a significant change in the spectral performance of the filter. No spectral change was evident after testing indicating an absence of any significant etching after the 100 hour exposure.

Abrasion Resistance, Adhesion, & Humidity Resistance

CGA filters have been qualified for adhesion using the snap tape test specified in MIL-C-48497, for abrasion resistance using the eraser test specified in MIL-C-675, and for humidity resistance using the aggravated test specified in MIL-STD-810E. These tests are commonly used as benchmarks for determining the robustness of thin film coatings.

Solubility

The extreme hardness of the Stabilife® coatings used to manufacture Colored-Glass Alternative Filters allows these filters to be subjected to normal and severe weather conditions as well as to the repeated handling and cleaning that is commonplace for filters that are used in a lab environment, without sustaining any surface degradation. Unlike some Colored-Glass Filters that can suffer surface damage from prolonged exposure to rain or submersion in water, CGA filters maintain their clarity and spectral performance under such extreme conditions.

Optical Radiation

Stabilife® coatings used to manufacture our CGA filters have been deployed in applications where they are exposed intense ultraviolet and high energy visible radiation with no change in spectral performance after prolonged exposure. These filters have also been evaluated for Laser Damage Threshold using a frequency-doubled Nd:YAG laser operating at 532 nm with a pulse width of 10 ns and a repetition rate of 20 Hz. Typical damage threshold values exceed 1.0 J/cm² .

Restrictions on Hazardous Substances (RoHS)

Unlike several Yellow, Orange, and Red Colored-Glass filters, Newport's Colored-Glass Alternative filters are fully compliant with RoHS regulations. They do not rely on a exemption and therefore, are not subject to the uncertainty of the review process.

Extreme Temperature

Colored-Glass Alternative filters are qualified for use at continuous operating temperatures between -100°C and +400°C.

Custom Capability

Newport's Colored-Glass Alternative filters were originally developed for custom and OEM applications either as alternatives to a Colored-Glass filter that utilized non-RoHS compliant material in it formulation, as replacements of a Colored-Glass filter that had been discontinued by one of the major Colored-Glass filter manufacturers, or as a new product to fill a gap in the wavelength offering of the major Colored-Glass filter manufacturers. The versatility of our coating processes and equipment support our ability to offer unlimited combinations of wavelength, size, shape, thickness, optical figure, surface quality, etc.. In the table that follows, we have listed some of the principle capability specifications for CGA filters Please provide your detailed requirements to our technical sales team and allow us to engineer the exact solution to meet your application.

Optical Filter Mounts

We offer a wide variety of optical filter mounts for securing and locating your optical filter. Popular types include:

Features

Angle of Incidence Effects

specified as a numerical value derived from the indices of the thin film layers of the CGA filter

Cone-Angle Effects

Stain Resistance

Abrasion Resistance, Adhesion, & Humidity Resistance

Solubility

Optical Radiation

Restrictions on Hazardous Substances (RoHS)

Extreme Temperature

Colored-Glass Alternative filters are qualified for use at continuous operating temperatures between -100°C and +400°C.

Custom Capability

Optical Filter Mounts

We offer a wide variety of optical filter mounts for securing and locating your optical filter. Popular types include:

High Performance Colored Glass Alternative Longpass Filters

High Performance Colored Glass Alternative Longpass Filters

Overview

Products

Notes:

Specifications

Specifications

Features

Angle of Incidence Effects

Cone-Angle Effects

Stain Resistance

Abrasion Resistance, Adhesion, & Humidity Resistance

Solubility

Optical Radiation

Restrictions on Hazardous Substances (RoHS)

Extreme Temperature

Custom Capability

Optical Filter Mounts

Features

Angle of Incidence Effects

Cone-Angle Effects

Stain Resistance

Abrasion Resistance, Adhesion, & Humidity Resistance

Solubility

Optical Radiation

Restrictions on Hazardous Substances (RoHS)

Extreme Temperature

Custom Capability

Optical Filter Mounts

Resources

Literature

Selection Guides

Resources

Literature

Selection Guides

Product Comparison

High Performance Colored Glass Alternative Longpass Filters

High Performance Colored Glass Alternative Longpass Filters

Overview

Products

Notes:

Specifications

Features

Angle of Incidence Effects

Cone-Angle Effects

Stain Resistance

Abrasion Resistance, Adhesion, & Humidity Resistance

Solubility

Optical Radiation

Restrictions on Hazardous Substances (RoHS)

Extreme Temperature

Custom Capability

Optical Filter Mounts

Angle of Incidence Effects

Cone-Angle Effects

Stain Resistance

Abrasion Resistance, Adhesion, & Humidity Resistance

Solubility

Optical Radiation

Restrictions on Hazardous Substances (RoHS)

Extreme Temperature

Custom Capability

Optical Filter Mounts

Resources

Literature

Selection Guides

Literature

Selection Guides

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