Abstract

A new saturable absorber Q switch for 1.54-µm Er:glass lasers is presented. The saturable absorber is a transparent glass ceramic that contains magnesium–aluminum spinel nanocrystallites doped with tetrahedrally coordinated Co2+ ions. We obtained Q-switched pulses of up to 5.5 mJ in energy and 80 ns in duration at 1.54 µm. The relaxation time of 4 A 24 T 1(4 F) transition bleaching was measured to be (450 ± 150) ns. Ground-state and excited-state absorption cross sections at 1.54-µm wavelength were estimated to be (3.2 ± 0.4) × 10-19 cm2 and (5.0 ± 0.6) × 10-20 cm2, respectively.

© 2001 Optical Society of America

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