Backward Terahertz Generation in Periodically Poled Lithium Niobate Crystal via Difference Frequency Generation
| Autor: | Yeung Lak Lee, Do-Kyeong Ko, Changsoo Jung, Bong-Ahn Yu, Chul-Sik Kee, Nan Ei Yu, Jongmin Lee |
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| Rok vydání: | 2007 |
| Předmět: |
Quasi-phase-matching
Materials science Physics and Astronomy (miscellaneous) Terahertz radiation business.industry Far-infrared laser General Engineering Physics::Optics General Physics and Astronomy Laser Terahertz spectroscopy and technology law.invention Photomixing Optics law Femtosecond Terahertz time-domain spectroscopy business |
| Zdroj: | Japanese Journal of Applied Physics. 46:1501-1504 |
| ISSN: | 1347-4065 0021-4922 |
| Popis: | We have investigated the terahertz radiation generated by femtosecond laser pulses in a periodically poled lithium niobate crystal. Two different types of terahertz radiation, forward and backward, could be generated in quasi-phase-matching structures. The generation of these two different types of radiation is due to difference frequency generation under the quasi-phase matching condition. A broadband femtosecond optical pulse contributes to wave mixing, which occurs between two components of an ultrashort laser pulse and a terahertz pulse, in a quasi-phase-matching crystal. We observed a backward terahertz radiation at approximately 1.3 THz and the frequencies of terahertz radiations are easily controlled by varying the domain structures. |
| Databáze: | OpenAIRE |
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