Accurate method for the measurement of absorption cross sections of solid-state saturable absorbers
- Cite this article as:
- Shcherbitsky, V., Girard, S., Fromager, M. et al. Appl Phys B (2002) 74: 367. doi:10.1007/s003400200809
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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.