Nonlinear absorption near 1.5 μm of cobalt doped LaGaO₃ crystals has been investigated. The observed dependence of transmission coefficient on incident energy density reveals a contribution of an excited state absorption. The assignment of ESA has been proposed tentatively, because a strong absorption of Co³⁺ prevents the location of excited levels of Co²⁺ which may be involved. It has been concluded that LaGaO₃:Co crystal is a good candiate as a passive Q-switch for erbium lasers operating near 1.5 μm.

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Volume179, Issue2

June 2000

Pages 463-468

Investigation of Nonlinear Absorption of LaGaO₃:Co Crystals near 1.5 μm

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Investigation of Nonlinear Absorption of LaGaO₃:Co Crystals near 1.5 μm