Simulation of nonlinear optical absorption in ZnSe:Co2+ crystals

✍ Scribed by Z. Mierczyk; A. Majchrowski; K. Oźga; A. Slezak; I.V. Kityk

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 473 KB
• Volume: 38
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/j.optlastec.2004.11.018

✦ Synopsis

The paper presents theoretical approach to simulation of nonlinear optical absorption in zinc selenide crystals doped with cobalt (II) ions (ZnSe:Co 2+ ), which was reported by us earlier (Opt. Laser Technology, V. 35, (2003), 169). We used ZnSe:Co 2+ crystals as saturable absorbers for generation of giant-pulse eye-safe laser radiation. It was found that minimal optical losses (maximal final transmission) occurred for ZnSe samples containing 1.6 Â 10 19 cm À3 of Co 2+ ions. Band structure and photoinduced molecular dynamics simulations were performed to explain the parabolic dependence of optical losses versus Co 2+ concentration. The minimum was shown to be the result of photoinduced anharmonic electron-phonon interaction.