Quadratic autocorrelation of free-electron laser radiation and photocurrent saturation in two-photon quantum well infrared photodetectors

Journal Article · Mon Sep 25 04:00:00 EDT 2006 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2357936· OSTI ID:20860937

Schneider, H; Drachenko, O; Winnerl, S; Helm, M; Walther, M ^[1]

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1. Institute of Ion Beam Physics and Materials Research, Forschungszentrum Rossendorf, P.O. Box 510119, 01314 Dresden (Germany)

Using the free-electron laser facility FELBE, the authors have studied the influence of the intensity on the quadratic autocorrelation measured with two-photon quantum well infrared photodetectors (QWIPs). At high illumination powers, the shape of the autocorrelation trace is affected by photocurrent saturation of the two-photon QWIP. They describe the saturation mechanism by different analytical models taking account of the photocurrent nonlinearity in analogy to linear QWIPs and give conditions where true quadratic behavior can be observed. While these studies were carried out at 77 K, properties of two-photon QWIPs at room temperature will also be addressed.

• OSTI ID: 20860937
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 13 Vol. 89; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
FREE ELECTRON LASERS
MULTI-PHOTON PROCESSES
NONLINEAR PROBLEMS
PHOTOCONDUCTIVITY
PHOTODETECTORS
PHOTONS
QUANTUM WELLS
SATURATION
TEMPERATURE RANGE 0273-0400 K