Induced absorption elements

Details Induced absorption elements Induced absorption elements

1978-05-25

1980-06-24

Moskowitz, Nelson

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

332 751, H01S 310

Patent

active

042096901

ABSTRACT:
A class of elements is dependent upon induced absorption for transmitted energy. Absorption is introduced by first pumping an active medium to produce a first excited state--generally an electronically excited state--whereafter the energy level of such excited state is reduced to a lower "metastable" excited state or by pumping directly to such metastable state. Increased absorption for radiation of a quantum energy corresponding with the difference between the metastable and some higher excited state occurs during the time interval that population of the metastable state is maintained. Elements may operate as extremely rapid shutters, switches, modulators, pulse sharpeners, etc.

REFERENCES:
patent: 3766498 (1973-10-01), Brewer et al.
patent: 3842372 (1974-10-01), Pao et al.
patent: 3864020 (1975-02-01), Armstrong et al.
Conway, "Light-Induced Modulation of . . . in CdS," Mar. 15, 1970, Jour. Appl. Phys., vol. 41, #4, pp. 1689-1693.
Schwartz et al., "Laser-Pulse Shaping Using . . . Behavior," 7/70, IEEE Jour. Quant. Elect., vol. QE6, #7, pp. 442-449.
Braerman, "Light-Induced Modulation of Absorption . . . ," Oct. 1974, pp. 1-53, NTIS AD-A002 051.

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