Coherent light generators – Particular active media – Liquid
Patent
1986-07-18
1989-02-21
Davie, James W.
Coherent light generators
Particular active media
Liquid
372 25, 372 89, H01S 320
Patent
active
048072370
ABSTRACT:
In a laser oscillator or laser amplifier, a so-called switching dye is used which strongly reduces the degree of amplification for the laser radiation after a short time interval, by means of transient absorption. Molecules or molecule systems in which a proton transfer takes place in the excited state can serve as switching dyes. The radiation pulse exciting the switching dye must have a sufficiently steep leading flank to assure that the excited state of the tautomeric form is rapidly occupied. The immediately following occupation of the ground state of the tautomeric form by emission of radiation and radiationless transitions, and/or of triplet states of the tautomeric and normal form by radiationless transitions, builds up a transient absorption and inhibits the rise of an inversion sufficient for renewed radiation emission.
REFERENCES:
Ernsting, et al; "Dye Laser . . . Proton Transfer"; Appl. Phys. B39, pp. -164; 1986.
Itoh, et al; "Transient Absorption . . . 7 Hydroxyflavone"; J. Am. Chem. Soc. 1984; 106; pp. 4320-4324.
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Von A. Graness et al. Untersuchungen zum Isotopenainfluss auf den Intramolekularen Protonentransfer . . . Z. Phys. Chem. Leipzig vol. 261 (1980) #6p.1152.
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Davie James W.
Max-Planck -Gesellschaft zur Forderung der Wissenschaften e.V.
Vo Xuan T.
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