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 4A2 →4T1(4F) 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
Original Manuscript: October 12, 2000
Revised Manuscript: March 3, 2001
Published: August 20, 2001
Alexander M. Malyarevich, Igor A. Denisov, Konstantin V. Yumashev, Olga S. Dymshits, Alexander A. Zhilin, and Uk Kang, "Cobalt-doped transparent glass ceramic as a saturable absorber Q switch for erbium:glass lasers," Appl. Opt. 40, 4322-4325 (2001)