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- W2890739879 abstract "Conventional materials engineering approaches for polycrystalline ceramic gain media rely on optically isotropic crystals with high equilibrium solubility of luminescent rare-earth (RE) ions. Crystallographic optical symmetry is traditionally relied upon to avoid scattering losses caused by refractive index mismatch at grain boundaries in randomly oriented anisotropic crystals and high-equilibrium RE-solubility is needed to produce sufficient photoluminescence (PL) for amplification and oscillation. These requirements exclude materials such as polycrystalline sapphire/alumina that have significantly superior thermo-mechanical properties (Rs~19,500Wm -1 ), because it possesses 1) uxiaxial optical properties that at large grain sizes, result in significant grain boundary scattering, and 2) a very low (~10 -3 %) RE equilibrium solubility that prohibits suitable PL. I present new materials engineering approaches operating far from thermodynamic equilibrium to produce a bulk Nd:Al 2 O 3 medium with optical gain suitable for amplification/lasing. The key insight relies on tailoring the crystallite size to the other important length scales-wavelength of light and interatomic dopant distances and show that fine crystallite sizes result in sufficiently low optical losses and over-equilibrium levels of optically active RE-ions, the combination of which results in gain. The emission bandwidth is broad, ~13THz, a new record for Nd 3+ transitions, enabling tuning from ~1050nm-1100nm and/or ultra-short pulses in a host with superior thermal-mechanical figure of merit. Laser grade Nd:Al 2 O 3 opens a pathway for lasers with revolutionary performance." @default.
- W2890739879 created "2018-09-27" @default.
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- W2890739879 date "2018-09-04" @default.
- W2890739879 modified "2023-09-24" @default.
- W2890739879 title "Intense photoluminescence and optical gain in rare-earth doped Polycrystalline Sapphire: a new bulk media for high-power phosphors and high-energy lasers" @default.
- W2890739879 doi "https://doi.org/10.1117/12.2322108" @default.
- W2890739879 hasPublicationYear "2018" @default.
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