Excited-state absorption studies of Cr(4+) ions in several garnet host crystals

An experimental study of saturable absorption and excited-state absorption (ESA) in several inorganic saturable absorbers, Cr(4 ):YAG, Cr(4 ):GGG, and Cr(4 ):YSGG, is presented. We provide the theoretical background of absorption characteristics in saturable absorbers that exhibit ESA, with some new...

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Published in:IEEE journal of quantum electronics 1998-02, Vol.34 (2), p.292-299
Main Authors: Burshtein, Z, Blau, P, Kalisky, Y, Shimony, Y, Kikta, M R
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Blau, P
Kalisky, Y
Shimony, Y
Kikta, M R
description An experimental study of saturable absorption and excited-state absorption (ESA) in several inorganic saturable absorbers, Cr(4 ):YAG, Cr(4 ):GGG, and Cr(4 ):YSGG, is presented. We provide the theoretical background of absorption characteristics in saturable absorbers that exhibit ESA, with some new results: approximate analytical solutions are proposed for the optical transmission in the case of a slow absorber, and for various light intensity conditions of spatially or temporally Gaussian beams in fast and slow absorbers. Experimentally, partial bleaching of the first excited state itself could be observed in Cr(4 ):YAG at lambda=1064 nm, yielding the higher excited-state lifetime as tau*=(0.55+/-0.1) ns. The regular transmission bleaching curve was measured in Cr(4 ):GGG, for the first time in this material, yielding sigma(ga)=(58+/-5)x10(-1) cm(2), and sigmae(s)=(13+/-2)x10(-19) cm(2 ) at lambda=1064 nm, ESA spectra were measured for the three materials between ~700 and 900 nm. All three exhibit crossing between saturable absorption at longer wavelengths and inverse saturable absorption at shorter wavelengths
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title Excited-state absorption studies of Cr(4+) ions in several garnet host crystals
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