30 August 2017 Long wavelength infrared (LWIR) AOTF and AOM modulators using Hg2Br2 crystals
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An acousto-optic devices were designed and fabricated using high quality single crystals of mercurous halide (Hg2X2) that were grown by physical vapor transport method (PVT). The orientation and the crystalline quality of the grown crystals were determined using high resolution x-ray diffraction (HRXRD) technique. The full width at half maximum (FWHM) of the grown mercurous bromide (Hg2Br2) crystals was measured to be 0.13 degrees for (004) reflection, which is the best that has been achieved so far for PVT grown mercurous halide single crystals. The extended defects of the crystals were also analyzed using high resolution x-ray diffraction topography. Preliminary studies were carried out to evaluate the performance of the crystals on acousto-optic modulator (AOM) and acousto-optic tunable filter (AOTF) applications. The results indicate the grown mercurous halide crystals are excellent materials for acousto-optic modulator as well as acousto-optic tunable filter device fabrications. The diffraction efficiencies of the fabricated AOM device with 1152 and 1523nm wavelength lasers polarizing parallel to the acoustic wave were found to be 35% and 28%, respectively. The diffraction efficiencies of the fabricated AOTF device with 10600 nm wavelength laser found to be 26%.
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Priyanthi M. Amarasinghe, Priyanthi M. Amarasinghe, Joo-Soo Kim, Joo-Soo Kim, Sudhir Trivedi, Sudhir Trivedi, Jolanta Soos, Jolanta Soos, Mark Diestler, Mark Diestler, Feng Jin, Feng Jin, Syed B. Qadri, Syed B. Qadri, Neelam Gupta, Neelam Gupta, Janet L. Jensen, Janet L. Jensen, James Jensen, James Jensen, } "Long wavelength infrared (LWIR) AOTF and AOM modulators using Hg2Br2 crystals", Proc. SPIE 10404, Infrared Sensors, Devices, and Applications VII, 104040T (30 August 2017); doi: 10.1117/12.2279160; https://doi.org/10.1117/12.2279160

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