Adiabatic inversion for selective excitation

Details Adiabatic inversion for selective excitation Adiabatic inversion for selective excitation

1978-11-08

1981-03-17

Davie, James W.

Oscillators

Molecular or particle resonant type

H01S 3091

Patent

active

042570131

ABSTRACT:
Method and apparatus for achieving isotopically selective adiabatic inversion, particularly for improved isotope separation efficiency. In a preferred embodiment for practicing the invention, chirped laser radiation induces photoionization of a vapor state material in isotopically selective excitation and ionization energy steps. A frequency sweep or "chirp" is provided in the excitation laser radiation at a controlled rate and over a range of frequencies which is limited to prevent loss of selectivity in the excitation. The frequency swept radiation has a theoretical capability of producing 100% inversion of ground state particles in the vapor. The features of the invention additionally permit excitation of a material to very high energy states useful in producing high frequency, ultraviolet lasing.

REFERENCES:
Loy, "Observation of Population Inversion by Optical Adiabatic Rapid Passage", Physical Review Letters, vol. 32, No. 15, Apr. 15, 1974, pp. 814-816.
Treacy, "Adiabatic Inversion with Light Pulses", Physics Letters, vol. 27A, No. 7, Aug. 26, 1968, pp. 421-422.
Treacy et al., "Adiabatic Inversion in the Infrared", Physics Letters, vol. 29A, No. 7., Jun. 16, 1969, pp. 369-370.

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