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Soviet Journal of Quantum Electronics

Transient energy exchange between opposite waves and narrowing of the stimulated emission spectrum of a laser to the absorption line of a resonant medium in the resonator

Pavel A Apanasevich, Anatolii A Afanas'ev, А. И. Урбанович

Published Apr 30, 1982• 6 citations
Publisher

Abstract

Transient energy exchange between opposite waves and narrowing of the stimulated emission spectrum of a laser to the absorption line of a resonant medium in the resonator, Pavel A Apanasevich, A A Afanas'ev, A I Urbanovich
DOI
10.1070/qe1982v012n04abeh012357

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The luminescence and laser characteristics of a synthetic opal matrix filled with organic dyes are studied upon excitation by nanosecond laser pulses. The appearance of stimulated emission in a partially ordered scattering medium is investigated. It is shown that if the luminescence spectrum of a dye (oxazine-17) is located far outside the photonic bandgap of the opal matrix, stimulated emission along a preferential direction in the (111) plane is observed when pumping exceeds a threshold even without an external optical cavity. The stimulated emission spectrum is considerably narrower than the luminescence spectrum and consists of several narrow lines located within the dye luminescence band. If the luminescence spectrum of a dye (rhodamine 6G) overlaps with the photonic bandgap of the opal matrix, a different picture is observed. The loss of radiation in the matrix leads to the red shift of the luminescence spectrum, while the stimulated emission as in the case of oxazine-17 lies is observed within the luminescence band.