Widely tunable broadband terahertz radiation generation using a configurationally locked polyene 2-[3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene] malononitrile crystal via difference frequency generation

Widely tunable terahertz (THz) waves were successfully generated from 0.5 to 10 THz via difference frequency generation (DFG) in a configurationally locked polyene 2-[3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene] malononitrile (OH1) crystal. Potassium titanium oxide phosphate optical paramet...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2013-05, Vol.111 (3), p.489-493
Main Authors: Uchida, Hirohisa, Tripathi, Saroj R., Suizu, Koji, Shibuya, Takayuki, Osumi, Takashi, Kawase, Kodo
Format: Article
Language:English
Subjects:
Crystals
Density
Energy use
Engineering
Lasers
Malononitrile
Nanocomposites
Nanomaterials
Nanostructure
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
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Summary:Widely tunable terahertz (THz) waves were successfully generated from 0.5 to 10 THz via difference frequency generation (DFG) in a configurationally locked polyene 2-[3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene] malononitrile (OH1) crystal. Potassium titanium oxide phosphate optical parametric oscillator pumped by nanosecond Q-switched Nd:YAG laser was used to generate two waves, which were then used to irradiate OH1 crystal. The maximum energy of the generated THz wave was about 461 pJ/pulse. We investigated the dependency of generated THz energy to the excitation pump power density and OH1 crystal thickness. In addition, we compared the THz energy generated by OH1 crystal to 4- N , N -dimethylamino-4′- N′ -methyl-4-stilbazolium tosylate (DAST) crystal using DFG, and we achieved 560 times higher energy using OH1 crystal than DAST crystal at around 1.1 THz.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-013-5362-0