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Springer series in optical sciences/SPringer series in optical sciences

An Atomic Resonance Filter Operating at Fraunhofer Wavelengths

Jerry A. Gelbwachs

Published Jan 1, 1987• 0 citations
Publisher
DOI
10.1007/978-3-540-47973-4_130

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The atomic resonance filter (ARF) is art ultra- high-Q (105–106) optical filter that is isotropic and insensitive to environmental factors and possesses a 180° acceptance angle.1 We are developing a novel ARF for satellite applications. Our filter operates in a Fraunhofer dip in the solar spectrum, thereby offering the key advantage of reduced solar background noise. Other important operational characteristics of the filter are: a projected conversion efficiency of blue-green light into the wavelength-shifted output light of ~90%, a 10-ns response time, and an output in the near UV, a spectral region that is efficiently detected by commercial large-area long-lived photomultiplier tubes.

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Active wavelength shifting in atomic resonance filters

Jerry A. Gelbwachs

Active wavelength-shifting is described as a method to expand the number of wavelengths at which atomic resonance filters operate. Optical pumping and exoergic collisional energy transfer are shown to be powerful wavelength-shifting techniques. Expressions have been derived for internal photon conversion efficiency in limiting cases. They are cast in forms that suggest simple branching ratio model equivalents. The photophysical models yield important insights into methods to obtain good photon conversion for even strongly absorbing levels. The results are applied to atomic resonance filters operating at intense Fraunhofer wavelengths. >

Conference on Lasers and Electro-Optics•May 21, 1990•0 citations
The atomic resonance filter (ARF) is art ultra- high-Q (105–106) optical filter that is isotropic and insensitive to environmental factors and possesses a 180° acceptance angle.1 We are developing a novel ARF for satellite applications. Our filter operates in a Fraunhofer dip in the solar spectrum, thereby offering the key advantage of reduced solar background noise. Other important operational characteristics of the filter are: a projected conversion efficiency of blue-green light into the wavelength-shifted output light of ~90%, a 10-ns response time, and an output in the near UV, a spectral region that is efficiently detected by commercial large-area long-lived photomultiplier tubes.
Active wavelength-shifting is described as a method to expand the number of wavelengths at which atomic resonance filters operate. Optical pumping and exoergic collisional energy transfer are shown to be powerful wavelength-shifting techniques. Expressions have been derived for internal photon conversion efficiency in limiting cases. They are cast in forms that suggest simple branching ratio model equivalents. The photophysical models yield important insights into methods to obtain good photon conversion for even strongly absorbing levels. The results are applied to atomic resonance filters operating at intense Fraunhofer wavelengths. >