9 October 1998 Self-pumped phase conjugate BaTiO3:Rh ring mirror at 1.06 μm: optimization of reflectivity, rise time, and fidelity
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Abstract
Photorefractive rhodium doped barium titanate (BaTiO3:Rh) is now well known for its significant response at near infrared wavelengths .We studied and characterized this crystal at 1.06 j.tm. By twowave mixing experiments in a 45°-cut crystal, we measured a maximum photorefractive gain F of 23 cm1 with cw illumination and 16.6 cm1 with nanosecond illumination, together with a low absorption (0. 1 cm1). Using spectroscopic determinations of the photorefractive sites 2 (Rh3, Rh4, Rh5), we showed that the photorefractive properties of BaTiO3 Rh could be well described by a three charge state model .This enabled to determine the internal parameters of the material using experimental characterizations and to accurately predict its performances at 1 .06 tm. Comparative characterizations of several BaTiO3:Rh samples proved that this material is now well reproducible, which is of prime importance for applications. Reproducibility, high photorefractive gain, low absorption and accurate theoretical description make BaTiO3:Rh a good candidate for realization and optimization of non linear functions like optical phase conjugation. The application we are interested in, is the dynamic wavefront correction of nanosecond Nd:YAG master-oscillator power-amplifier (MOPA) laser sources.
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Nicolas Huot, Nicolas Huot, Jean-Michel C. Jonathan, Jean-Michel C. Jonathan, Gilles Pauliat, Gilles Pauliat, Daniel Rytz, Daniel Rytz, Gerald Roosen, Gerald Roosen, } "Self-pumped phase conjugate BaTiO3:Rh ring mirror at 1.06 μm: optimization of reflectivity, rise time, and fidelity", Proc. SPIE 3470, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications IV, (9 October 1998); doi: 10.1117/12.326849; https://doi.org/10.1117/12.326849
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