Photoionization optical filter and detector

Details Photoionization optical filter and detector Photoionization optical filter and detector

1985-10-28

1989-11-07

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

2503385, 250340, 2503361, G01J 536

Patent

active

048794686

ABSTRACT:
An optical filter and detector, and a related method for its operation, in which signal photons are admitted into a detector cell and selectively excite atoms or molecules of a vapor to a selected metastable state. An illuminating laser then photoionizes a large proportion of the excited atoms or molecules, and the resulting free electrons are collected as a measure of the number of incident signal photons. The initial excitation step to a metastable state is highly sensitive to the wavelength of the signal photons and therefore acts as a narrowband filter.

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Marling et al., "An Ultrahigh--Q Isotropically Sensitive Optical Filter Employing Atomic Resonance Transitions", Journal of Applied Physics, vol. 50, No. 2, Feb. 1979, pp. 610-614.
Gelbwachs et al., "Atomic Vapor Quantum Counter: Narrow-Band Infrared Upconverter", IEEE Transactions on Electron Devices, vol. ED-27, No. 1, Jan. 1980, pp. 99-108.

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