OPTICAL PHASE-CONJUGATION PROPERTY OF THREE-PHOTON EXCITED BACKWARD STIMULATED EMISSION
Autor: | Guang S. He, Paras N. Prasad, Faming Xu, Ning Cheng, Qingdong Zheng |
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Rok vydání: | 2007 |
Předmět: |
Physics
Active laser medium Physics and Astronomy (miscellaneous) Holographic grating business.industry Physics::Optics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Gain-switching Wavelength Optics Stimulated emission business Phase conjugation Lasing threshold Beam (structure) |
Zdroj: | Journal of Nonlinear Optical Physics & Materials. 16:137-155 |
ISSN: | 1793-6624 0218-8635 |
DOI: | 10.1142/s0218863507003615 |
Popis: | Three-photon pumped cavityless lasing experiments have shown that the forward and backward stimulated emission (cavityless lasing) beams manifest different divergence angles and spatial/temporal fluctuation behaviors. When a dye solution as the gain medium is pumped by a pulsed laser beam with ~ 1500-nm wavelength and ~ 150-fs pulse duration, the backward stimulated emission beam exhibits a smaller divergence angle and much better spatial/temporal stability than the forward stimulated emission beam. These apparently unexpected results can be explained reasonably by assuming that the backward stimulated emission beam exhibits an optical phase-conjugation property, so that influences from a random spatial/temporal change of the refractive-index in the lasing medium can be automatically removed for this backward lasing beam. A physical model of wave-front reconstruction via pump-beam induced holographic grating in an aberrated gain medium is proposed, which is supported by a rigorous theoretical analysis. |
Databáze: | OpenAIRE |
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