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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 23 — Nov. 5, 2012
  • pp: 25752–25757

Terahertz generation by optical rectification in lithium niobate crystal using a shadow mask

Yuri Avestisyan, Caihong Zhang, Iwao Kawayama, Hironaru Murakami, Toshihiro Somekawa, Haik Chosrowjan, Masayuki Fujita, and Masayoshi Tonouchi  »View Author Affiliations

Optics Express, Vol. 20, Issue 23, pp. 25752-25757 (2012)

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A simple approach to generate high energy, frequency and bandwidth tunable multicycle THz pulses by optical rectification (OR) of spatially shaped femtosecond laser pulses in the lithium niobate (LN) crystal is proposed and demonstrated. A one dimensional binary shadow mask is used as a laser beam shaper. By building the mask’s image in the bulk LN crystal with various demagnifications, the frequency of THz generation was tuned in the range of 0.3 – 1.2 THz. There exist also an opportunity to tune the bandwidth of THz generation from 20 GHz to approximately 1 THz by changing the optical beam size on the crystal. The energy spectral density of narrowband THz generation is almost independent of the bandwidth and is typically 0.18 μJ/THz for ~1 W pump power at 1 kHz repetition rate.

© 2012 OSA

OCIS Codes
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(260.3090) Physical optics : Infrared, far

ToC Category:
Ultrafast Optics

Original Manuscript: September 5, 2012
Revised Manuscript: October 23, 2012
Manuscript Accepted: October 23, 2012
Published: October 30, 2012

Yuri Avestisyan, Caihong Zhang, Iwao Kawayama, Hironaru Murakami, Toshihiro Somekawa, Haik Chosrowjan, Masayuki Fujita, and Masayoshi Tonouchi, "Terahertz generation by optical rectification in lithium niobate crystal using a shadow mask," Opt. Express 20, 25752-25757 (2012)

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