Cr/sup 2+/-doped zinc chalcogenides as efficient, widely tunable mid-infrared lasers
| Autor: | Kathleen I. Schaffers, William F. Krupke, Ralph H. Page, G.D. Wilke, K.-T. Chen, Stephen A. Payne, J.B. Tassano, Laura D. DeLoach, Arnold Burger, F.D. Patel |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Materials science
Photoluminescence business.industry Chalcogenide Analytical chemistry Laser pumping Condensed Matter Physics Laser Atomic and Molecular Physics and Optics Semiconductor laser theory law.invention Optical pumping chemistry.chemical_compound chemistry Absorption band law Optoelectronics Electrical and Electronic Engineering Luminescence business |
| Zdroj: | IEEE Journal of Quantum Electronics. 33:609-619 |
| ISSN: | 0018-9197 |
| Popis: | Transition-metal-doped zinc chalcogenide crystals have recently been investigated as potential mid-infrared lasers. Tetrahedrally coordinated Cr/sup 2+/ ions are especially attractive as lasants on account of high luminescence quantum yields for emission in the 2000-3000-nm range. Radiative lifetimes and emission cross sections of the upper /sup 5/E state are respectively /spl sim/10 /spl mu/s and /spl sim/10/sup -18/ cm/sup 2/. The associated absorption band peaked at /spl sim/1800 mm enables laser-diode pumping of the Cr/sup 2+/ systems. Laser demonstrations with ZnS:Cr and ZnSe:Cr (using a MgF/sub 2/:Co/sup 2+/ laser pump source) gave slope efficiencies up to 30%. Excited-state-absorption losses appear small, and passive losses dominate at present. Tuning experiments with a diffraction grating produce a tuning range covering at least 2150-2800 nm. Laser crystals can be produced by Bridgman growth, seeded physical vapor transport, or diffusion doping. Zinc chalcogenide thermomechanical properties of interest for medium-to-high-power operation compare favorably with those of other host materials, except for the larger refractive-index derivative dn/dT. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|