CO2 laser used for generation of Cr4+ centers in YAG:Cr Mg crystals

Zygmunt Mierczyk; Piotr Szope; Jadwiga Mierczyk; Zygmunt Frukacz

doi:10.1117/12.402883

4 October 2000 CO₂ laser used for generation of Cr⁴⁺centers in YAG:Cr Mg crystals

Zygmunt Mierczyk, Piotr Szope, Jadwiga Mierczyk, Zygmunt Frukacz

Proceedings Volume 4237, Laser Technology VI: Progress in Lasers; (2000) https://doi.org/10.1117/12.402883
Event: Laser Technology VI, 1999, Szczecin, Poland

Abstract

We report the first demonstration of Cr⁴⁺ centers generation in YAG:Cr,Mg crystals using CO₂ laser radiation. After crystal growth only a small part of chromium ions is introduced into a crystal structure as Cr⁴⁺ ions in tetrahedral positions, the other ones are at different positions or at mixed valency Cr³⁺ and Cr⁴⁺. Chromium ions of Cr⁴⁺ valency can occur in the desired points of YAG structure as a result of complex reaction sin solid-state phase. Such reactions proceed during multi-stage crystal annealing. The paper presents the result of investigations of YAG:Cr,Mg crystals after CO₂ laser annealing in oxidizing atmosphere at a temperature of 600 divided by 900 degrees C. Investigations of YAG:Cr⁴⁺ spectroscopic properties and measurements of absorption and luminescence bands, allow estimation of chromium ion concentration at particular charging state and positions in YAG crystalline structure, and allow also to determine their mutual relations and influence on non-linear properties of absorber. Basing on ESA and two-level absorber model, the absorption cross section, concentration of active centers, relaxation time, saturation energy, and non-active losses have been estimated.

Citation Download Citation

Zygmunt Mierczyk, Piotr Szope, Jadwiga Mierczyk, and Zygmunt Frukacz "CO₂ laser used for generation of Cr⁴⁺centers in YAG:Cr Mg crystals", Proc. SPIE 4237, Laser Technology VI: Progress in Lasers, (4 October 2000); https://doi.org/10.1117/12.402883

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