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A pump–probe technique with picosecond resolution was used to record and derive the differential and excited-state absorption (ESA) spectra of a (LMA) single crystal in the visible and near-infrared spectral regions. Time resolution allowed us to observe ESA bands that can be assigned to a optical transition and to transitions from the thermally populated excited state to doublet levels that arise from the free-ion level of the tetrahedrally coordinated ion. Intensity-dependent transmission measurements were also carried out at 1.34 and 1.54 µm. Passive Q switching of (1.34-µm) and of (1.54-µm) lasers by use of the crystal as a saturable absorber was demonstrated. The pulse durations (energies) of the Q-switched and lasers were found to be 75 ns (3.8 mJ) and 50 ns (4.5 mJ), respectively.
© 1999 Optical Society of America
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