Abstract

Saturable-absorber Q switching of a neodymium-doped YAlO3 laser at 1.34 µm and an erbium-doped glass laser at 1.54 µm with a Co2+:MgAl2O4 crystal was demonstrated. Q-switched 1.34-µm pulses of 19-mJ energy and 60-ns duration and Q-switched 1.54-µm pulses of 2.7-mJ energy and 75-ns width were obtained. The ground-state absorption cross sections of the Co2+:MgAl2O4 crystal were estimated to be (2.8 ± 0.4) × 10-19 and (3.5 ± 0.6) × 10-19 cm2 at 1.34 and 1.54 µm, respectively. The 4 T 1(4 F) → 4 A 2 relaxation time of the Co2+ ion in the MgAl2O4 crystal was measured to be ∼350 ns.

© 1999 Optical Society of America

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