Novel non-stoichiometric Co<sup>2+</sup>: spinel passive Q-switch

Jennifer L. Stone-Sundberg; Milan R. Kokta; Narasimha S. Prasad; Ramesh K. Shori

doi:10.1117/12.623235

27 April 2005 Novel non-stoichiometric Co²⁺: spinel passive Q-switch

Jennifer L. Stone-Sundberg, Milan R. Kokta, Narasimha S. Prasad, Ramesh K. Shori

Proceedings Volume 5707, Solid State Lasers XIV: Technology and Devices; (2005) https://doi.org/10.1117/12.623235
Event: Lasers and Applications in Science and Engineering, 2005, San Jose, California, United States

Abstract

The development of an alumina-rich cobalt-doped spinel saturable absorber for the passive q-switching of 1530-1555 nm lasing is reported1. This optimized composition results in crystals with excellent dopant uniformity that are highly manufacturable. The crystal growth and materials characterization are described as well as initial passive qswitch testing of the material. The single crystals grown and investigated crystallized in the Fd3m space group and have the formula Mg_1-xCo_xAl_yO_z where x is greater than 0 and less than 1, y is greater than 2 and less than about 8, and z is between about 4 and 13. Comparison data of stoichiometric spinel MgAl₂O₄ and alumina-rich non-stoichiometric spinel MgAl₆O₁₀ are presented. The spinel lattice is comprised of octahedral and tetrahedral cationic sites, and in the alumina-rich spinel essentially all of the magnesium and cobalt occupy tetrahedral sites. The alumina-rich cobalt-doped spinel studied exhibited uniform cobalt-dopant distribution throughout the crystal and desirable mechanical and physical properties. Q-switched pulses were produced using the alumina-rich Co²⁺:MgAl₆O₁₀ saturable absorber in a 980 nm diode-pumped Yb:Er:glass solid-state-laser operating at 1543 nm. The q-switching established employed the ⁴T₁ absorption band of the Co²⁺: MgAl₆O₁₀ and with quasi-CW pumping, pulsewidths greater than 20 ns, pulse energies of greater than 250 mJ, and free-running pulse repetition frequencies (PRFs) up to 1.2 kHz were demonstrated.

Citation Download Citation

Jennifer L. Stone-Sundberg, Milan R. Kokta, Narasimha S. Prasad, and Ramesh K. Shori "Novel non-stoichiometric Co²⁺: spinel passive Q-switch", Proc. SPIE 5707, Solid State Lasers XIV: Technology and Devices, (27 April 2005); https://doi.org/10.1117/12.623235

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