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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 8 — Apr. 13, 2009
  • pp: 6676–6681

Extremely frequency-widened terahertz wave generation using Cherenkov-type radiation

Koji Suizu, Kaoru Koketsu, Takayuki Shibuya, Toshihiro Tsutsui, Takuya Akiba, and Kodo Kawase  »View Author Affiliations


Optics Express, Vol. 17, Issue 8, pp. 6676-6681 (2009)
http://dx.doi.org/10.1364/OE.17.006676


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Abstract

Terahertz (THz) wave generation based on nonlinear frequency conversion is promising way for realizing a tunable monochromatic bright THz-wave source. Such a development of efficient and wide tunable THz-wave source depends on discovery of novel brilliant nonlinear crystal. Important factors of a nonlinear crystal for THz-wave generation are, 1. High nonlinearity and 2. Good transparency at THz frequency region. Unfortunately, many nonlinear crystals have strong absorption at THz frequency region. The fact limits efficient and wide tunable THz-wave generation. Here, we show that Cherenkov radiation with waveguide structure is an effective strategy for achieving efficient and extremely wide tunable THz-wave source. We fabricated MgO-doped lithium niobate slab waveguide with 3.8 μm of thickness and demonstrated difference frequency generation of THz-wave generation with Cherenkov phase matching. Extremely frequency-widened THz-wave generation, from 0.1 to 7.2 THz, without no structural dips successfully obtained. The tuning frequency range of waveguided Cherenkov radiation source was extremely widened compare to that of injection seeded-Terahertz Parametric Generator. The tuning range obtained in this work for THz-wave generation using lithium niobate crystal was the widest value in our knowledge. The highest THz-wave energy obtained was about 3.2 pJ, and the energy conversion efficiency was about 10-5 %. The method can be easily applied for many conventional nonlinear crystals, results in realizing simple, reasonable, compact, high efficient and ultra broad band THz-wave sources.

© 2009 Optical Society of America

OCIS Codes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.4223) Nonlinear optics : Nonlinear wave mixing

ToC Category:
Nonlinear Optics

History
Original Manuscript: March 13, 2009
Revised Manuscript: April 5, 2009
Manuscript Accepted: April 6, 2009
Published: April 7, 2009

Citation
Koji Suizu, Kaoru Koketsu, Takayuki Shibuya, Toshihiro Tsutsui, Takuya Akiba, and Kodo Kawase, "Extremely frequency-widened terahertz wave generation using Cherenkov-type radiation," Opt. Express 17, 6676-6681 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-8-6676


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