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D.D Markushev J Jovanovic-Kurepa 《Journal of Quantitative Spectroscopy & Radiative Transfer》2003,76(1):85-99
A detailed analysis of the total average number of absorbed photons 〈n〉total during Infrared multiphoton absorption processes in mixtures of SF6-Ar, N2 and CH4 buffer gases is presented. The results for 〈n〉total are deduced using pulsed photoacoustic technique in collisional regime. Complete analysis is based on the theoretical generalized coupled two-level model (GCT) and its application to different gas mixtures. Evaluation of partial 〈n〉coll. values is presented too, obtained using the results from time-resolved optoacoustic (TROA) and time-resolved absorption (TRA) methods for V-T relaxation times (τV-T) and the saturable absorber (SA) method for R,R-T relaxation times (τrot.-rel.), and applying them directly to the GCT model. All methods (TROA and SA) and the GCT model use the same photoacoustic results from our experiment under identical experimental conditions. 相似文献
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V. M. Markushev M. V. Ryzhkov Ch. M. Briskina H. Cao L. A. Zadorozhnaya E. I. Givargisov H. Zhong S. -W. Wang W. Lu 《Laser Physics》2007,17(9):1109-1118
Spectra of ZnO random lasers were obtained using a Peltier-cooled CCD camera Videoscan-285 at a single shot of nanosecond pumping. It was demonstrated that these spectra differ essentially from lasing spectra under picosecond pumping: as a rule, the line widths are significantly larger and the spectra often change essentially from shot to shot in a random manner on the same pumping spot. We suggest that large line widths can be the result of many lasing acts appearing during a single pumping pulse and of the lasing frequency changing in every lasing act. The random variations of spectra from shot to shot can be called forth by spontaneous emission fluctuations. 相似文献
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