Fluorescence Properties of Fe2+- and Co2+-doped Hosts of CdMnTe Compositions as Potential Mid-Infrared Laser Materials

Report No. ARL-TR-5770
Authors: Tigran Sanamyan, Sudhir Trivedi, and Mark Dubinskii
Date/Pages: September 2011; 22 pages
Abstract: Solid-state laser sources emitting in a mid-infrared (IR) spectral range are of significant practical interest due to the great variety of potential applications in the biomedical industry, remote sensing, pollution monitoring, molecular spectroscopy, residual gas tracing, and IR countermeasures. The need for mid-IR wavelengths directly obtainable from a diode-pumped solid-state gain medium stimulates searches for new laser materials with wide tunability. We report the results of spectroscopic investigation of Fe2+- and Co2+-doped low-phonon single crystals of the cadmium telluride (CdTe) family. It is shown that compositional changes of the host material significantly affect the radiative lifetime of the initial laser level, the bandwidth of the emission and absorption spectra, and their overall positioning, which will translate into potential mid-IR laser threshold and tunability. Single crystal composition also affects the Co2+ and Fe2+ dopant lifetimes and temperature dependencies. Crystal growth effort is underway in order to improve the quality of the samples toward satisfying laser-grade loss figure requirements.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2011