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

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.
Authors:
; ;  [1]
  1. Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin (Germany)
Publication Date:
OSTI Identifier:
22283286
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; CRYSTAL STRUCTURE; CRYSTALS; ELECTROMAGNETIC PULSES; LASER RADIATION; PHOTONS; THZ RANGE; ZINC TELLURIDES