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Terahertz field enhancement via coherent superposition of the pulse sequences after a single optical-rectification crystal

MPS-Authors
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Sajadi,  Mohsen
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Kampfrath,  Tobias
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Fulltext (public)

Recycling_20140217.pdf
(Any fulltext), 93KB

Supplementary Material (public)

fig1.eps
(Supplementary material), 47KB

Fig. 2.pdf
(Supplementary material), 25KB

Fig. 3.pdf
(Supplementary material), 22KB

Fig. 4.pdf
(Supplementary material), 44KB

Citation

Sajadi, M., Wolf, M., & Kampfrath, T. (2014). Terahertz field enhancement via coherent superposition of the pulse sequences after a single optical-rectification crystal. Applied Physics Letters, 104(9): 091118. doi:10.1063/1.4867648.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0018-5C4D-5
Abstract
Terahertz electromagnetic pulses are frequently generated by optical rectification of femtosecond laser pulses. In many cases, the efficiency of this process is known to saturate with increasing intensity of the generation beam because of two-photon absorption. Here, we demonstrate two routes to reduce this effect in ZnTe(110) crystals and enhance efficiency, namely, by (i) recycling the generation pulses and by (ii) splitting each generation pulse into two pulses before pumping the crystal. In both methods, the second pulse arrives ∼1 ns after the first one, sufficiently long for optically generated carriers to relax. Enhancement is achieved by coherently superimposing the two resulting terahertz fields.