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High Sensitivity and Quick Response Laser Infrared Detector

IP.com Disclosure Number: IPCOM000096431D
Original Publication Date: 1963-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Okaya, A: AUTHOR

Abstract

A minute amount of radiant energy in the infrared range can be employed to trigger stimulated emission of radiation in a He-Ne gas laser. Thus, there is realized a sensitive detector of infrared radiation.

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High Sensitivity and Quick Response Laser Infrared Detector

A minute amount of radiant energy in the infrared range can be employed to trigger stimulated emission of radiation in a He-Ne gas laser. Thus, there is realized a sensitive detector of infrared radiation.

The He-Ne gas mixture is pumped to and held, by a continuous application of pumping energy, at a point very near the threshold point. The population of properly excited neon atoms (those existing at energy level 1) within the mixture is held at a number just below that number required to sustain laser action within the gas medium. The system is enclosed in a resonator and is adapted to support laser transition, once triggered, between energy levels 1 and 3, producing output radiation at wavelength lambda(1).

Energy level 2, below energy level 1 by an amount equal to the wavelength lambda(2) of a quantum of radiant energy to be detected (infrared), is populated by some number of neon atoms. When a photon of infrared radiation enters the system through the input and is absorbed by a neon atom at level 2, that atom is raised to energy level 1 and increases the population of excited atoms at the latter level. If sufficient infrared radiation is thus received and absorbed, the population at level 1 is raised to threshold and laser action is triggered within the gas mixture. Such obtains a readily observable indication of the presence of at least a given minimum amount of input infrared radiation.

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