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Two-photon photocurrent autocorrelation using intersubband transitions at nearly-resonant excitation

Zweiphotonen Photostrom Autokorrelation von Intersubbandübergängen bei nahezu resonanter Anregung
: Schneider, H.; Maier, T.; Liu, H.C.; Walther, M.

Fulltext urn:nbn:de:0011-n-710443 (108 KByte PDF)
MD5 Fingerprint: 05fc6801abf139d8fcae9a4b45e3a699
Created on: 5.3.2009

Optics Express 16 (2008), No.3, pp.1523-1528
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer IAF ()
QWIP; GaAs/AlGaAs; intersubband transition; two photon absorption; autocorrelation

We investigate nonlinear mid-infrared detection via two-photon transitions involving two bound subbands and one continuum resonance in an n-type multiple quantum well. By varying the excitation energy, we have tuned the two-photon transition from resonant, yielding optimum resonant enhancement with a real intermediate state, to nearly-resonant, with a virtual but resonantly enhanced intermediate state. For autocorrelation purposes, the latter configuration improves time resolution whilst partially retaining a resonant enhancement of the two-photon transition strength.