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Accurate method for the measurement of absorption cross sections of solid-state saturable absorbers |
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| Authors: | VG Shcherbitsky S Girard M Fromager R Moncorgé NV Kuleshov VI Levchenko VN Yakimovich B Ferrand |
| Institution: | (1) Centre Interdisciplinaire de Recherche Ions Lasers (CIRIL), UMR 6637 CNRS/CEA/ISMRA, Université de Caen, 6 Blvd Maréchal Juin, 14050 Caen Cedex, France, FR;(2) International Laser Center (ILC), 65 F. Scoriny av., Minsk, Belarus, BY;(3) Institute of Solid-State and Semiconductor Physics, National Academy of Science, 17 P. Brovki str., Minsk, Belarus, BY;(4) LETI-CEA Techniques Avancées, CENG 85X, 38041 Grenoble, France, FR |
| Abstract: | A rigorous approach taking into account both the temporal and spatial distributions of the pulsed probe beam used for transmission measurements of solid-state saturable absorbers is applied to characterise these absorbers accurately. The use of this method can significantly influence the resulting value for the ground-state absorption cross section. It also permits us to avoid the introduction of an artificial excited-state absorption in systems where, according to energy-level diagrams, no such loss should occur. This is illustrated in the case of passive Q-switchers for 1.5-μm lasers such as Co2+-doped LaMgAl11O19 and MgAl2O4 and Co2+- or Cr2+-doped ZnSe and ZnS. Received: 21 November 2001 / Revised version: 22 January 2002 / Published online: 14 March 2002 |
| Keywords: | PACS: 42 55 Rz 42 60 Jf 42 60 Gd 78 20-e |
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