Abstract

We propose a generally applicable velocity matching method for THz-pulse generation by optical rectification in the range below the phonon frequency of the nonlinear material. Velocity matching is based on pulse front tilting of the ultrashort excitation pulse and is able to produce a large area THz beam. Tuning of the THz radiation by changing the tilt angle is experimentally demonstrated for a narrow line in the range between 0.8- 0.97 times the phonon frequency. According to model calculations broadband THz radiation can be generated at lower frequencies. Advantages of the new velocity matching technique in comparison to the electro-optic Cherenkov effect and non-collinear beam mixing are discussed.

© 2002 Optical Society of America

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Appl. Phys. Lett. (3)

A. Nahata, A.S. Weling and T.F. Heinz, �??A wideband coherent terahertz spectroscopy system using optical rectification and electro-optic sampling,�?? Appl. Phys. Lett. 69, 2321-2323 (1996).
[CrossRef]

Q. Wu and X.-C. Zhang, �??Free-space electro-optic sampling of mid-infrared pulses,�?? Appl. Phys. Lett. 71, 1285-1286 (1997).
[CrossRef]

R. Huber, A. Brodschelm, F. Tauser and A. Leitenstorfer, �??Generation and field-resolved detection of femtosecond electromagnetic pulses tunable up to 41 THz,�?? Appl. Phys. Lett. 76, 3191-3193 (2000).
[CrossRef]

IEEE J. Quantum Electron. (1)

D. A. Kleinman and D. H. Auston, �??Theory of electrooptic shock radiation in nonlinear optical media,�?? IEEE J. Quantum Electron. 20, 964-970 (1984).
[CrossRef]

J. Opt. Soc. Am. B (2)

Nature (1)

B. E. Cole, J. B. Williams, B. T. King, M. S. Sherwin and C. R. Stanley, �??Coherent manipulation of semiconductor quantum bits with terahertz radiation,�?? Nature 410, 60-63 (2001).
[CrossRef]

Opt. Commun. (1)

Zs. Bor and B. Racz, �??Group velocity dispersion in prisms and its application to pulse compression and travelling-wave excitation,�?? Opt. Commun. 54, 165-170 (1985).
[CrossRef]

Opt. Lett. (1)

Opt. Quantum Electron. (1)

J. Hebling, �??Derivation of the pulse front tilt caused by angular dispersion,�?? Opt. Quantum Electron. 28, 1759-1763 (1996).
[CrossRef]

Phys. Rev. Lett. (3)

M. C. Nuss, P. M. Mankiewich, M. L. O�??Malley, E. H. Westerwick and P. B. Littlewood, �??Dynamic conductivity and coherence peak in YBa2Cu3O7 superconductors,�?? Phys. Rev. Lett. 66, 3305-3308 (1991).
[CrossRef]

A. Leitenstorfer, S. Hunsche, J. Shah, M. C. Nuss and W. H. Knox, �??Femtosecond charge transport in polar semiconductors,�?? Phys. Rev. Lett. 82, 5140-5143 (1999).
[CrossRef]

D. H. Auston, K.P. Cheung, J. A. Valdmanis and D. A. Kleinman, �??Cherenkov radiation from femtosecond optical pulses in electro-optic media,�?? Phys. Rev. Lett. 53, 1555-1558 (1984).
[CrossRef]

Rev. Mod. Phys. (1)

A.S. Barker and R. Loudon, �??Response function in the theory of Raman scattering by vibrational and polariton modes in dielectric crystals,�?? Rev. Mod. Phys. 44, 18-47 (1972).
[CrossRef]

Science (1)

T. E. Stevens, J. K. Wahlstrand, J. Kuhl and R. Merlin, �??Cherenkov radiation at speeds below the light threshold: Phonon assisted phase matching,�?? Science 291, 627-630 (2001).
[CrossRef]

Solid State Commun. (1)

S. Ushioda and J.D. McMullen, �??Measurement of the frequency dependence of the phonon damping function by Raman scattering from polaritons in GaP,�?? Solid State Commun. 11, 299-304 (1972).
[CrossRef]

Other (2)

M. Born and E. Wolf, Principles of Optics (Cambridge University Press, 1999).

P.A. Tipler, Physics for scientists and engineers (W.H. Freeman and Company, 1999).

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