1. Competition between linear and nonlinear processes during generation of pulsed terahertz radiation in a ZnTe crystal
- Author
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Vladimir Ya Gaivoronsky, Aleksandr V Shuvaev, M. M. Nazarov, Svetlana A Shkel'nyuk, Yevgenii V Shepelyavyi, Dmitrii A Sapozhnikov, and Alexander P. Shkurinov
- Subjects
Materials science ,Terahertz radiation ,business.industry ,Physics::Optics ,Nonlinear optics ,Second-harmonic generation ,Statistical and Nonlinear Physics ,Laser ,Two-photon absorption ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Optical rectification ,Optics ,law ,Femtosecond ,High harmonic generation ,Optoelectronics ,Electrical and Electronic Engineering ,business - Abstract
The generation of terahertz (THz) pulses by the optical rectification of femtosecond laser pulses in a ZnTe crystal is studied. A substantial decrease in the THz radiation power was observed upon tight focusing of laser radiation into the crystal. It is shown that the consideration of competing two-photon absorption and second-harmonic generation processes proceeding simultaneously with optical rectification cannot explain this effect even qualitatively. It is assumed that the observed decrease in the THz radiation power is caused by a decrease in the size of a source of nonlinear polarisation. The conditions are found for the most efficient generation of THz radiation in the ZnTe crystal.
- Published
- 2005
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