Generation of narrowband terahertz radiation by an ultrashort laser pulse in a bulk LiNbO_3 crystal
| Autor: | S. A. Sychugin, Michael I. Bakunov, E. A. Mashkovich |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Femtosecond pulse shaping Materials science business.industry Terahertz radiation Far-infrared laser Physics::Optics Statistical and Nonlinear Physics Laser 01 natural sciences Atomic and Molecular Physics and Optics law.invention 010309 optics Photomixing Optics Multiphoton intrapulse interference phase scan law 0103 physical sciences Femtosecond Ultrafast laser spectroscopy Optoelectronics business Computer Science::Databases |
| Zdroj: | Journal of the Optical Society of America B. 34:1805 |
| ISSN: | 1520-8540 0740-3224 |
| Popis: | We show that a femtosecond laser pulse propagating in a LiNbO3 crystal as a superposition of ordinary and extraordinary waves can efficiently generate narrowband terahertz radiation in a quasi-phase-matched regime. The generation mechanism is similar to that in periodically poled crystals, although it occurs in a bulk crystal. In particular, a 600 fs pulse from a Yb-doped laser amplifier can generate radiation at ∼0.5 THz with bandwidth of 3.6 GHz and efficiency ∼10−5. Frequency tuning can be achieved by tilting the laser beam in the crystal. The predicted effect can be used for creating tunable spectrally bright terahertz sources. |
| Databáze: | OpenAIRE |
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