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ASTRONOMICAL
FILTERS: METHANE BANDPASS
Rugate Technologies has fabricated custom astronomical
bandpass filters for the Gemini 8M Telescope Project at Hilo, HI. A set
consists of a set of two complementary bandpass filters in the
near-infrared (NIR) spectral region that provide inband transmission
over 80%, out of band blocking above OD 4, and superior edge slopes of
1.2%. These filters operate at cryogenic temperature. Call for pricing.
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RUGATE FILTERS:
In additional to traditional discrete-layer optical
coatings, Rugate Technologies, Inc. specializes in Rugate coatings.
Rugate coatings are optical interference films where the refractive
index of the film continuously and periodically grades as a function of
the film's optical thickness. Rugate filters were originally conceived
as a means of providing narrow reflection notch filters. By varying the
index profile sinusoidally, rather than as a square wave, and by
controlling the index excursion, very narrow notch filters free of
higher order harmonics can be produced. Due to the lack of higher order
harmonics, multiple index profiles can be easily superimposed to
produce complex spectral performance.
Consider Rugate Technology for your optical filter
requirements.
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