Compare Model Drawings, CAD & Specs Cut-on Wavelength Cut-on Wavelength Tolerance Availability Price
Longpass Filter, Colored-Glass Alternative, 2x2 in., 225 nm Cut-on
$94
In Stock
225 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 280 nm Cut-on
$94
In Stock
280 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 295 nm Cut-on
$94
2 Weeks
295 nm ±5 nm
2 Weeks
Longpass Filter, Colored-Glass Alternative, 2x2 in., 305 nm Cut-on
$94
In Stock
305 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 320nm Cut-on
$94
In Stock
320 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 335 nm Cut-on
$94
In Stock
335 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 345 nm Cut-on
$94
In Stock
345 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 360 nm Cut-on
$94
In Stock
360 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 375 nm Cut-on
$94
In Stock
375 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 385 nm Cut-on
$94
In Stock
385 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 395 nm Cut-on
$94
2 Weeks
395 nm ±5 nm
2 Weeks
Longpass Filter, Colored-Glass Alternative, 2x2 in., 400 nm Cut-on
$94
In Stock
400 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 420 nm Cut-on
$94
In Stock
420 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 435 nm Cut-on
$94
2 Weeks
435 nm ±5 nm
2 Weeks
Longpass Filter, Colored-Glass Alternative, 2x2 in., 455 nm Cut-on
$94
2 Weeks
455 nm ±5 nm
2 Weeks
Longpass Filter, Colored-Glass Alternative, 2x2 in., 475 nm Cut-on
$94
In Stock
475 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 495 nm Cut-on
$94
In Stock
495 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 515 nm Cut-on
$94
In Stock
515 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 530 nm Cut-on
$94
In Stock
530 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 550 nm Cut-on
$94
In Stock
550 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 570 nm Cut-on
$94
In Stock
570 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 590 nm Cut-on
$94
In Stock
590 nm ±5 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 610 nm Cut-on
$94
In Stock
610 nm ±6 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 630 nm Cut-on
$94
In Stock
630 nm ±6 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 645 nm Cut-on
$94
In Stock
645 nm ±6 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 665 nm Cut-on
$94
In Stock
665 nm ±6 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 695 nm Cut-on
$94
In Stock
695 nm ±6 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 715 nm Cut-on
$94
In Stock
715 nm ±7 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 760 nm Cut-on
$94
In Stock
760 nm ±7 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 780 nm Cut-on
$94
In Stock
780 nm ±7 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 800 nm Cut-on
$94
In Stock
800 nm ±8 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 830 nm Cut-on
$94
In Stock
830 nm ±8 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 850 nm Cut-on
$94
In Stock
850 nm ±8 nm
In Stock
Longpass Filter, Colored-Glass Alternative, 2x2 in., 1000 nm Cut-on
$94
In Stock
1000 nm ±9 nm
In Stock

CGA filters are also available in Round 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

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:
λθ = λo [1-(no/ne)2 sin2θ]1/2
where
λθ = Cut-on wavelength at θ° angle of incidence
λo = Cut-on wavelength at 0° angle of incidence
θ = Angle of incident light off normal incidence
no = Effective index of refraction of the environment (no = 1 in air)
ne = 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