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Appl Opt. 2012 Aug 1;51(22):5458-63. doi: 10.1364/AO.51.005458.

Free of reabsorption upper-state lifetime measurements by the method of transient gratings.

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B.I. Stepanov Institute of Physics, National Academy of Sciences, 68 Nezalezhnasti Avenue, Minsk 220072, Republic of Belarus.


Light reabsorption and radiation trapping can noticeably distort fluorescence decay in solid-state laser gain media with a partial overlap of absorption and emission bands. In this paper, the upper-state lifetime measurements in laser materials by the method of transient gratings are discussed. A theoretical model for description of reabsorption in a thin layer is developed. It is shown that under certain conditions reabsorption has no effect on the transient time of refractive index grating and thus the true upper-state lifetime can be measured. Some experimental results confirming effectiveness of the technique are presented.


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