THz generation via optical rectification with ultrashort laser pulse focused to a line
THz generation via optical rectification with ultrashort laser pulse focused to a line
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DOI：
10.1007/s00340-005-1826-1
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发表时间：
2005-05
期刊：
影响因子：
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通讯作者：
A. Stepanov;J. Hebling;J. Kuhl
中科院分区：
文献类型：
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作者：
A. Stepanov;J. Hebling;J. Kuhl
We report on efficient THz pulse generation via optical rectification with femtosecond laser pulses focused to a line by a cylindrical lens. This configuration provides phase-matched conditions in the superluminal regime. 35 pJ THz pulses have been generated with this technique in a stoichiometric LiNbO3crystal pumped by 2 μJ femtosecond laser pulses at room temperature. An unusual superquadratic rise of the THz pulse energy with the laser pulse energy has been observed at high laser energies. This extraordinary energy dependence of the THz generation efficiency is explained by self-focusing of the laser beam in the crystal. Z-scan measurements and comparison of the THz pulse spectra created with laser pulses having different energies confirm this interpretation.
