Abstract

A scheme for efficient generation of multi-cycle terahertz pulses by optical rectification in an artificial periodically poled rubidium (Rb)-doped potassium titanyl phosphate (Rb:PPKTP) structure is proposed. The structure consists of a multi-slit phase mask placed in front of a large-aperture Rb:KTP crystal. The developed theory predicts the THz pulse energy of 343 µJ and the efficiency of the pump-to-terahertz conversion of 0.44% for pump pulse peak intensity of ${70}\;{{\rm GW/cm}^2}$ inside an aperture of ${9.4} \times {15}\;{{\rm mm}^2}$ at a crystal temperature of 85 K. The opportunity to control the THz spectral bandwidth (in the range of ${1.8}\% \sim{85}\%$) and frequency of the generation (from 0.3 to 0.8 THz) is shown. The results of the study indicate the high potential of the artificial Rb:PPKTP structure for tunable high-energy THz generation.

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