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Bandwidth tunable THz wave generation in large-area periodically poled lithium niobate

Caihong Zhang, Yuri Avetisyan, Andreas Glosser, Iwao Kawayama, Hironaru Murakami, and Masayoshi Tonouchi

Open Access Open Access

Abstract

A new scheme of optical rectification (OR) of femtosecond laser pulses in a periodically poled lithium niobate (PPLN) crystal, which generates high energy and bandwidth tunable multicycle THz pulses, is proposed and demonstrated. We show that the number of the oscillation cycles of the THz electric field and therefore bandwidth of generated THz spectrum can easily and smoothly be tuned from a few tens of GHz to a few THz by changing the pump optical spot size on PPLN crystal. The minimal bandwidth is 17 GHz that is smallest ever of reported in scheme of THz generation by OR at room temperature. Similar to the case of Cherenkov-type OR in single-domain LiNbO3, the spectrum of THz generation extends from 0.1 THz to 3 THz when laser beam is focused to a size close to half-period of PPLN structure. The energy spectral density of narrowband THz generation is almost independent of the bandwidth and is typically 220 nJ/THz for ~1 W pump power at 1 kHz repetition rate.

©2012 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 (a) Schematic of THz wave generation in Z-cut PPLN crystal; the polarization of fs-laser pulse and optical axis of PPLN crystal are both along the Z direction (b) incident face of optical beam on PPLN crystal (in YZ plane), (c) top view schematic of THz generation (in XY plane) (d) corresponding wave vector diagram.

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Fig. 2
Fig. 2 (a) Temporal forms of THz pulses generated with different pump beam spot sizes dy on the PPLN crystal (b) corresponding Fourier intensity spectra, and the inset shows the THz intensity spectrum with arbitrary unit generated by pump beam spot size dy ≈0.04 mm.

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Fig. 3
Fig. 3 (a) Temporal forms of THz pulses generated with different pump powers in the PPLN crystal (b) THz power versus of pump intensity, solid line is fitted by Pimp ∝ (Io)1.8.

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Fig. 4
Fig. 4 Energy of THz pulse and amplitude of THz field (see inset) versus of pump beam spot size dy in PPLN crystal.

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Equations (2)

Equations on this page are rendered with MathJax. Learn more.

k THz 2 = k g 2 + k Λ 2
f THz = c Λ n THz 2 − n g 2 .
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