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Spontaneous parametric down-conversion of photons at 660 nm to the terahertz and sub-terahertz frequency range

: Haase, Björn; Kutas, Mirco; Riexinger, Felix; Bickert, Patricia; Keil, Andreas; Molter, Daniel; Bortz, Michael; Freymann, Georg von

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Optics Express 27 (2019), Nr.5, S.7458-7468
ISSN: 1094-4087
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ITWM ()
spontaneous parametric down-conversion (SPDC); terahertz; quantum sensing

We report on spontaneous parametric down-conversion (SPDC) in periodically poled lithium niobate (PPLN) using 660 nm pump wavelength and the type 0 phase-matching condition to the terahertz and even sub-terahertz frequency range. Detection of the frequency-shifted signal photons is achieved by using highly efficient and narrowband volume Bragg gratings and an uncooled sCMOS camera. The acquired frequency-angular spectrum shows backward and forward generation of terahertz and sub-terahertz photons by SPDC, as well as up-conversion and higher order quasi phase-matching (QPM). The frequency-angular spectrum is theoretically calculated using a Monte-Carlo integration scheme showing a high agreement with the measurement. This work is one important step toward quantum sensing and imaging in the terahertz and sub-terahertz frequency range.