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Updated: May 30, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Two-photon photocurrent autocorrelation using intersubband transitions at nearly-resonant excitation
Harald Schneider1, Thomas Maier, H C Liu
1Forschungszentrum Dresden Rossendorf, Institute of Ion Beam Physics and Materials Research, P. O. Box 510119, D-01314 Dresden, Germany. h.schneider@fzd.de
Abstract:
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.
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