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  Towards terahertz detection and calibration through spontaneous parametric down-conversion in the terahertz idler-frequency range generated by a 795 nm diode laser system

Kornienko, V. V., Kitaeva, G. K., Sedlmeir, F., Leuchs, G., & Schwefel, H. G. L. (2018). Towards terahertz detection and calibration through spontaneous parametric down-conversion in the terahertz idler-frequency range generated by a 795 nm diode laser system. APL Photonics, 3(5): 051704. doi:10.1063/1.5011201.

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 Creators:
Kornienko, Vladimir V.1, Author
Kitaeva, Galiya Kh.1, Author
Sedlmeir, Florian2, Author           
Leuchs, Gerd3, 4, Author           
Schwefel, Harald G. L.1, Author
Affiliations:
1external, ou_persistent22              
2Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society, ou_2364707              
3Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society, ou_2364698              
4University of Erlangen Nuremberg, ou_persistent22              

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 Abstract: We study a calibration scheme for terahertz wave nonlinear-optical detectors based on spontaneous parametric down-conversion. Contrary to the usual low wavelength pump in the green, we report here on the observation of spontaneous parametric down-conversion originating from an in-growth poled lithium niobate crystal pumped with a continuous wave 50 mW, 795 nm diode laser system, phase-matched to a terahertz frequency idler wave. Such a system is more compact and allows for longer poling periods as well as lower losses in the crystal. Filtering the pump radiation by a rubidium-87 vapor cell allowed the frequency-angular spectra to be obtained down to similar to 0.5 THz or similar to 1 nm shift from the pump radiation line. The presence of an amplified spontaneous emission "pedestal" in the diode laser radiation spectrum significantly hampers the observation of spontaneous parametric down-conversion spectra, in contrast to conventional narrowband gas lasers. Benefits of switching to longer pump wavelengths are pointed out, such as collinear optical-terahertz phase-matching in bulk crystals. (c) 2018 Author(s).

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Language(s): eng - English
 Dates: 2018-03-062018-05
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1063/1.5011201
 Degree: -

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Title: APL Photonics
Source Genre: Journal
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Publ. Info: Americcan Institutes of Physics
Pages: - Volume / Issue: 3 (5) Sequence Number: 051704 Start / End Page: - Identifier: ISSN: 2378-0967