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

Authors :
Martin Wolf
Tobias Kampfrath
Mohsen Sajadi
Source :
Applied Physics Letters
Publication Year :
2014

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.

Details

Language :
English
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi.dedup.....542257ea751dc09f6ee3e38103be8552