<i>Q</i> switching of a diode-pumped Nd<sup>3+</sup>:KGd(WO<sub>4</sub>)<sub>2</sub> laser at 1.35 μm by use of cobalt-doped magnesium- and zinc-aluminosilicate glass ceramics as saturable absorbers is demonstrated. <i>Q</i>-switching efficiency up to 40% has been obtained. Ground-state absorption cross sections for Co<sup>2+</sup> ions at the wavelengths of 1.35 and 1.54 μm are estimated to be (3.5–4.0) × 10<sup>−19</sup> cm<sup>2</sup>. Bleaching relaxation times under the excitation of the <sup>4</sup>A<sub>2</sub> → <sup>4</sup>T<sub>1</sub>(<sup>4</sup>F) transition of tetrahedrally coordinated Co<sup>2+</sup> ions are of 280 ± 50 ns and 700 ± 80 ns for magnesium- and zinc-aluminosilicate glass ceramics, respectively.
© 2004 Optical Society of America
Yuri V. Volk, Igor A. Denisov, Alexander M. Malyarevich, Konstantin V. Yumashev, Olga S. Dymshits, Alexander V. Shashkin, Alexander A. Zhilin, Uk Kang, and Kyeong-Hee Lee, "Magnesium- and Zinc-Aluminosilicate Cobalt-Doped Glass Ceramics as Saturable Absorbers for Diode-Pumped 1.3-μm Laser," Appl. Opt. 43, 682-687 (2004)