Why is Custom 420nm Longpass Filter Better?

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

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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.

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.

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