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Continuous-wave optical parametric source for terahertz waves tunable from 1 to 4.5 THz frequency

: Kießling, Jens; Buse, Karsten; Vodopyanov, Konstantin L.; Breunig, Ingo


Vodopyanov, K.L. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Nonlinear Frequency Generation and Conversion. Materials, Devices, and Applications XIII : 4-6 February 2014, San Francisco, CA, USA
Bellingham, WA: SPIE, 2014 (Proceedings of SPIE 8964)
ISBN: 978-0-8194-9877-9
Paper 896408
Conference "Nonlinear Frequency Generation and Conversion - Materials, Devices, and Applications" <13, 2014, San Francisco/Calif.>
Fraunhofer IPM ()
nonlinear optics; optical parametric oscillators; terahertz waves

We demonstrate the continuous-wave operation of a cascade that has been successfully applied so far only for picosecond systems: A doubly-resonant optical-parametric oscillator (OPO) based on lithium niobate generates signal and idler waves close to degeneracy. Subsequently, these two light fields are converted to a terahertz wave via difference frequency mixing in an orientation-patterned gallium arsenide crystal placed inside the OPO cavity. Using this scheme, we achieved tunability from 1 to 4.5 THz frequency, a linewidth smaller than 10 MHz, and a Gaussian beam profile. The output power is of the order of tens of μW, with a scalability into the milliwatt regime.