Terahertz generation in lithium niobate driven by Ti:sapphire laser pulses and its limitations

Xiaojun Wu; Sergio Carbajo; Koustuban RaviFrederike AhrGiovanni CirmiYue ZhouOliver D. MuckeFranz X. Kartner

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Terahertz generation in lithium niobate driven by Ti:sapphire laser pulses and its limitations

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We experimentally investigate the limits of 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/cm~2 for this pulse duration. 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.

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《Optics Letters》 |2014年第18期|5403-5406|共4页
作者
Xiaojun Wu; Sergio Carbajo; Koustuban RaviFrederike AhrGiovanni CirmiYue ZhouOliver D. MuckeFranz X. Kartner;
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作者单位

Center for Free-Electron Laser Science, DESY and Center for Ultrafast Imaging, Hamburg 22607, Germany;

Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA;

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中图分类计量学;
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Terahertz generation in lithium niobate driven by Ti:sapphire laser pulses and its limitations

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