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Design of a Multistep Phase Mask for High-Energy Terahertz Pulse Generation by Optical Rectification

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Abstract

A new scheme for generating high-energy terahertz (THz) pulses based on using a multistep phase mask (MSPM) is suggested and analyzed. The mask is placed on the entrance surface of the nonlinear optical (NLO) crystal eliminating the necessity of the imaging optics. In contrast to the contact grating method, introduction of large amounts of angular dispersion is avoided. The operation principle of the suggested scheme is based on the fact that the MSPM splits a single input beam into many smaller time-delayed “beamlets,” which together form a discretely tilted-front laser pulse in NLO crystal. The analysis of THz-pulse generation in ZnTe and lithium niobate (LN) crystals shows that application of ZnTe crystal is more preferable, especially when long-wavelength pump sources are used. The dimensions of the mask’s steps required for high-energy THz-pulse generation in ZnTe and LN crystals are calculated. The optimal number of steps is estimated, taking into account individual beamlet’s spatial broadening and problems related to the mask fabrication. The proposed method is a promising way to develop high-energy, monolithic, and alignment-free THz-pulse sources.

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Acknowledgments

This work is partially supported by State Committee of Science of Armenia (15T-6B245). The help of Dr. H. Chosrowjan is acknowledged.

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Authors and Affiliations

  1. Microwave Engineering Department, Yerevan State University, 1 Alex Manoogian, 0025, Yerevan, Armenia

    Y. Avetisyan, A. Makaryan & V. Tadevosyan

  2. Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka, 565-0871, Japan

    M. Tonouchi

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  1. Y. Avetisyan
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Correspondence to Y. Avetisyan.

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Avetisyan, Y., Makaryan, A., Tadevosyan, V. et al. Design of a Multistep Phase Mask for High-Energy Terahertz Pulse Generation by Optical Rectification. J Infrared Milli Terahz Waves 38, 1439–1447 (2017). https://doi.org/10.1007/s10762-017-0429-3

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