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4 October 2023 High-energy multicycle THz pulse generation in artificial PPLN crystal
Y. H. Avetisyan, A. H. Makaryan, M. I. Bakunov
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Proceedings Volume 12683, Terahertz Emitters, Receivers, and Applications XIV; 126830M (2023) https://doi.org/10.1117/12.2673386
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States
Abstract
In this report, we theoretically show that intense multicycle terahertz (THz) pulses can be generated by optical rectification in an artificial periodically poled lithium niobate (PPLN) structure formed by placing a phase-shift mask in front of a large aperture stoichiometric lithium niobate (SLN) crystal. In contrast to the common scheme with a triangular prism-shaped congruent LN crystal, THz generation is studied for a rectangular trapezoid SLN sample having a small angle (≈ 26°) of the inclined surface. A matching Si-prism is attached to the trapezoid base to guide the generated THz wave into free space. It is shown that the number of field oscillations (from nearly single-cycle to many cycles) can be varied by the changing of the pump beam linear size in the crystal. Also, there is a possibility of tuning the generation frequency (in the range of 0.4 - 0.8 THz) by building a mask image in the SLN with various demagnification. According to estimates, the energy of narrowband THz pulses at a frequency of 0.5 THz in SLN crystal at temperature 100 K is 265 μJ at a pump pulse energy of 220 mJ. This corresponds to a pump-to-THz conversion efficiency of 0.12 %.
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Y. H. Avetisyan, A. H. Makaryan, and M. I. Bakunov "High-energy multicycle THz pulse generation in artificial PPLN crystal", Proc. SPIE 12683, Terahertz Emitters, Receivers, and Applications XIV, 126830M (4 October 2023); https://doi.org/10.1117/12.2673386
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KEYWORDS
Terahertz radiation
Nonlinear crystals
Lithium niobate
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