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Autocorrelation measurements of free-electron laser radiation using a two-photon QWIP

Autokorrelationsmessung der Laserstrahlung eines freien Elektronenlasers mit Zwei-Photonen-QWIPs
: Schneider, H.; Drachenko, O.; Winnerl, S.; Helm, M.; Maier, T.; Walther, M.


Perera, A.G.U.:
QWIP 2006, Proceedings of the International Workshop on Quantum Well Infrared Photodetectors : 18 - 24 June 2006, Kandy, Sri Lanka
Amsterdam: Elsevier, 2007 (Infrared Physics and Technology 50.2007,2/3)
ISSN: 1350-4495
International Workshop on Quantum Well Infrared Photodetectors (QWIP) <4, 2006, Kandy>
Conference Paper, Journal Article
Fraunhofer IAF ()
time resolved spectroscopy; zeitaufgelöste Spektroskopie; heterodyne detection; Heterodyn-Detektion; free-electron lasers; freier Elektronenlaser; Quantum Well Infrared Photodetector (QWIP); Quantumwell Infrarot-Photodetektor

The two-photon QWIP comprises three equidistant subbands, namely two bound states localized in the quantum well and an extended state in the continuum. This device is very promising for quadratic autocorrelation measurements of pulsed mid-infrared lasers due to its resonantly enhanced optical nonlinearity and sub-ps time resolution. We report on interferometric autocorrelation measurements of ps optical pulses from a free-electron laser (FEL). The intense FEL radiation further allows us to study the saturation properties of two-photon QWIPs at liquid nitrogen temperature and their detection properties at 300 K. The device is well suited for standard diagnostics of the FEL pulse shape via interferometric autocorrelation.