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Photographs of the domain structure revealed by chemical etching on (a) the patterned face and (b) the nonpatterned face of a PPKTA sample poled with 2.3 kV/mm.
OPO threshold as a function of cavity length. Squares—experimental data, dotted, solid, and dashed lines—theoretical OPO threshold corresponding to a , , and , respectively.
OPO pump depletion and efficiency as a function of pump power. Squares—pump depletion, circles—signal efficiency, triangles—signal and idler efficiency.
Temperature tuning of the signal and idler waves. Squares—experimental data, solid lines—calculated theoretical dependence. The vertical error bars show FWHM of the measured signal spectrum and the horizontal ones show the uncertainty in temperature.
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