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AIP conference proceedings

‘‘Superfluorescent chemically driven visible laser transitions using fast near resonant energy transfer’’

J. R. Woodward, S. H. Cobb, James L. Gole

Published Jan 1, 1989• 2 citations
Publisher

Abstract

Highly exothermic metal oxidations have been employed to develop the first chemically driven pulsed laser amplifiers operative in the visible spectral region. These amplifiers rely on ultrafast near resonant energy transfer from chemically created metastable storage states of SiO and GeO to subsequently lasing thallium (535 nm) and gallium (417 nm) atoms from which superfluorescent pulses are monitored.

DOI
10.1063/1.38594

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Highly exothermic metal oxidations have been employed to develop the first chemically driven pulsed laser amplifiers operative in the visible spectral region. These amplifiers rely on ultrafast near resonant energy transfer from chemically created metastable storage states of SiO and GeO to subsequently lasing thallium (535 nm) and gallium (417 nm) atoms from which superfluorescent pulses are monitored.
Evidence is obtained which demonstrates the potential for developing purely chemical visible lasers based on rapid near-resonant energy transfer from metastable excited triplet states of germanium and silicon monoxide (a/sup 3/ Sigma /sup +/,b/sup 3/ Pi ) to select metal atoms. In this study, the Group IIIA metal atoms were chosen as the energy receptors for the energy transfer-pump sequence. Excited triplet states were generated from the Ge-O/sub 3/, Ge-N/sub 2/, Si-N/sub 2/O, and Si-NO/sub 2/ reactions; the bulk of the experimental results was obtained with a germanium-based system. The energy stored in the long-lived triplet states is transferred to pump X/sup 2/P/sub 1/2/ thallium, indium, and gallium atoms to their lowest lying /sup 2/S/sub 1/2/ states. The authors observe a system of temporal behavior which suggests the creation of a population inversion producing a gain condition and forming the basis for full cavity oscillation on the Tl 7/sup 2/S/sub 1/2/-6P/sub 3/2/ transition at 535 nm.>
Abstract : This program pursued new sources (and amplifiers) of coherent and incoherent radiation in the ultraviolet and visible regions of the spectrum, as well as their applications in photochemistry and medical therapeutics. Research highlights include: (1) Demonstration of lasing in the visible and near-infrared from Na and Rb, respectively, by photoassociating alkali-rare gas atomic pairs, (2) Observation of the collapse of a 3-level laser system by tuning the energy defect between the pumped and lasing states- this resolves a fundamental question in quantum electronics, and (3) Demonstrating a new micro/nano optical amplifier well-suited for routing optical power in a scattering medium such as human tissue.
Energy transfer from selectively formed metastable states of SiO is used to pump sodium-atom laser amplifiers at lambda approximately=569 nm (4d/sup 2/D-3p/sup 2/P), lambda approximately=616 nm (5s/sup 2/S-3p/sup 2/P), and lambda approximately=819 nm (3d/sup 2/D-3p/sup 2/P). The a/sup 3/ Sigma /sup +/ and b/sup 3/ Pi states of SiO are generated in high yield from the Si+N/sub 2/O to SiO+N/sub 2/ reaction. The energy stored in the triplet states is transferred in a highly efficient collisional process to pump sodium atoms to their lowest excited 3d/sup 2/D, 4d/sup 2/D, and 5s/sup 2/S states. Adopting a sequence in which high concentrations of silicon and sodium atoms are mixed and oxidized, a continuous amplification (gain condition) is monitored which suggests the creation of a population inversion among the receptor sodium-atom energy levels and forms the basis for full cavity oscillation on the Na4d/sup 2/D-3p/sup 2/P transition at 569 nm.>