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Photonics 2019, 6(1), 9;

Nearly Single-Cycle Terahertz Pulse Generation in Aperiodically Poled Lithium Niobate

Microwave Engineering Department, Yerevan State University, Yerevan 0025, Armenia
Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
Author to whom correspondence should be addressed.
Received: 21 December 2018 / Revised: 24 January 2019 / Accepted: 24 January 2019 / Published: 27 January 2019
(This article belongs to the Special Issue Terahertz Photonics)
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In the present work, an opportunity of nearly single-cycle THz pulse generation in aperiodically poled lithium niobate (APPLN) crystal is studied. A radiating antenna model is used to simulate the THz generation from chirped APPLN crystal pumped by a sequence of femtosecond laser pulses with chirped delays (m = 1, 2, 3 …) between adjacent pulses. It is shown that by appropriately choosing Δtm, it is possible to obtain temporal overlap of all THz pulses generated from positive (or negative) domains. This results in the formation of a nearly single-cycle THz pulse if the chirp rate of domain length δ in the crystal is sufficiently large. In the opposite case, a few cycle THz pulses are generated with the number of the cycles depending on δ. The closed-form expression for the THz pulse form is obtained. The peak THz electric field strength of 0.3 MV/cm is predicted for APPLN crystal pumped by a sequence of laser pulses with peak intensities of the separate pulse in the sequence of about 20 GW/cm2. By focusing the THz beam and increasing the pump power, the field strength can reach values in the order of few MV/cm. View Full-Text
Keywords: terahertz; ultrafast photonics; nonlinear optics; lithium niobate terahertz; ultrafast photonics; nonlinear optics; lithium niobate

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Avetisyan, Y.; Tonouchi, M. Nearly Single-Cycle Terahertz Pulse Generation in Aperiodically Poled Lithium Niobate. Photonics 2019, 6, 9.

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