20 February 2014 Continuous-wave optical parametric source for terahertz waves tunable from 1 to 4.5 THz frequency
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Abstract
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.
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Jens Kießling, Karsten Buse, Konstantin L. Vodopyanov, Ingo Breunig, "Continuous-wave optical parametric source for terahertz waves tunable from 1 to 4.5 THz frequency", Proc. SPIE 8964, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIII, 896408 (20 February 2014); doi: 10.1117/12.2041915; https://doi.org/10.1117/12.2041915
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