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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 9 — Mar. 20, 2001
  • pp: 1423–1426

Arrayed silicon prism coupler for a terahertz-wave parametric oscillator

Kodo Kawase, Jun-ichi Shikata, Hiroaki Minamide, Kazuhiro Imai, and Hiromasa Ito  »View Author Affiliations


Applied Optics, Vol. 40, Issue 9, pp. 1423-1426 (2001)
http://dx.doi.org/10.1364/AO.40.001423


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Abstract

Using room-temperature parametric oscillation of a LiNbO3 crystal pumped by a Q-switched Nd:YAG laser with a simple configuration, we have realized a widely tunable coherent terahertz- (THz-) wave source in the range between 1 and 3 THz. Inasmuch as the THz wave is affected by total internal reflection at the crystal edge, we used a Si prism coupler to couple out the THz wave. We introduce an arrayed Si-prism coupler that increases the efficiency and decreases the diffraction angle. By use of the arrayed-prism coupler, there is a sixfold increase in coupling efficiency and a 40% decrease in the far-field beam diameter, compared with the use of a single-prism coupler. We discuss the negative effect of the free carriers at the Si-prism surface that is excited by the scattered pump beam, and the positive effect of cavity rotation on the unidirectional radiation of the THz wave from a Si prism.

© 2001 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(230.5480) Optical devices : Prisms

History
Original Manuscript: May 15, 2000
Revised Manuscript: September 29, 2000
Published: March 20, 2001

Citation
Kodo Kawase, Jun-ichi Shikata, Hiroaki Minamide, Kazuhiro Imai, and Hiromasa Ito, "Arrayed silicon prism coupler for a terahertz-wave parametric oscillator," Appl. Opt. 40, 1423-1426 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-9-1423


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References

  1. K. Kawase, M. Sato, T. Taniuchi, H. Ito, “Coherent tunable THz-wave generation from LiNbO3 with monolithic grating coupler,” Appl. Phys. Lett. 68, 2483–2485 (1996). [CrossRef]
  2. K. Kawase, M. Sato, K. Nakamura, T. Taniuchi, H. Ito, “Unidirectional radiation of widely tunable THz wave using a prism coupler under noncollinear phase matching condition,” Appl. Phys. Lett. 71, 753–755 (1997). [CrossRef]
  3. J. Shikata, K. Kawase, M. Sato, T. Taniuchi, H. Ito, “Enhancement of THz-wave output from LiNbO3 optical parametric oscillators by cryogenic cooling,” Opt. Lett. 24, 202–204 (1999). [CrossRef]
  4. M. A. Piestrup, R. N. Fleming, R. H. Pantell, “Continuously tunable submillimeter wave source,” Appl. Phys. Lett. 26, 418–419 (1975). [CrossRef]
  5. T. Nozokido, J. J. Chang, C. M. Mann, T. Suzuki, K. Mizuno, “Optimization of a Schottky barrier diode in the submillimeter wave region,” Int. J. Infrared Millim. Waves 15, 1851–1866 (1994). [CrossRef]
  6. T. Nozokido, H. Minamide, K. Mizuno, “Modulation of submillimeter wave radiation by laser-produced free carriers in semiconductors,” Electron. Commun. Jp. Part 2 Electron 80(no.6), 1–9 (1997).
  7. T. Walther, K. R. Chapin, J. W. Bevan, “Comment on ‘Unidirectional radiation of widely tunable THz wave using a prism coupler under noncollinear phase matching condition’,” Appl. Phys. Lett. 73, 3610–3611 (1998). [CrossRef]

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