Journal
OPTICS EXPRESS
Volume 27, Issue 5, Pages 6580-6597Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.27.006580
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Funding
- Air Force Office of Scientific Research (AFOSR) [A9550-12-1-0499]
- European Research Council [609920]
- Center for Free-Electron Laser Science at DESY
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We introduce a technique to generate compressed broadband terahertz pulses based on cascaded difference-frequency generation. The approach employs a non-uniform sequence of pump pulses in aperiodically poled crystals. The pump-pulse format and poling of crystals conceived are such that the emergent terahertz pulse is already compressed. The method circumvents pump-pulse distortions that result from non-collinear approaches and the need for external compression. While capable of generating even single-cycle pulses, it is particularly efficient for the generation of pulses with few to tens-of-cycles duration. For instance, calculations accounting for cascading effects predict conversion efficiencies in the few percent range for cryogenically-cooled lithium niobate. The focused electric fields are >> 100 MV/m in free space. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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