Terahertz Generation in Lithium Niobate Driven by Ti:Sapphire Laser Pulses and its Limitations
| Autor: | Wu, Xiaojun, Carbajo, Sergio, Ravi, Koustuban, Ahr, Frederike, Cirmi, Giovanni, Zhou, Yue, Mücke, Oliver D., Kärtner, Franz X. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1364/OL.39.005403 |
| Popis: | We experimentally investigate the limits to 800 nm-to-terahertz (THz) energy conversion in lithium niobate at room temperature driven by amplified Ti:Sapphire laser pulses with tilted-pulse-front. The influence of the pump central wavelength, pulse duration, and fluence on THz generation is studied. We achieved a high peak efficiency of 0.12% using transform limited 150 fs pulses and observed saturation of the optical to THz conversion efficiency at a fluence of 15 mJ/cm2. We experimentally identify two main limitations for the scaling of optical-to-THz conversion efficiencies: (i) the large spectral broadening of the optical pump spectrum in combination with large angular dispersion of the tilted-pulse-front and (ii) free-carrier absorption of THz radiation due to multi-photon absorption of the 800 nm radiation. Comment: 4 pages, 6 figures |
| Databáze: | arXiv |
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