Journal
INFRARED PHYSICS & TECHNOLOGY
Volume 47, Issue 1-2, Pages 182-187Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.infrared.2005.02.024
Keywords
-
Categories
Ask authors/readers for more resources
We report on QWIPs optimized for nonlinear detection using a bandstructure design with three energetically equidistant subbands. The double resonant character of the two-photon transition from the ground state into the second excited state results in quadratic dependence of the photocurrent on the incident power down to excitation densities as low as 0.1 W/cm(2). We have used these two-photon QWIPs as quadratic detectors in second-order interferometric autocorrelation measurements allowing for the separation of coherent and incoherent contributions to the photocurrent. We have studied the carrier dynamics and the influence of the QW doping on both phase and energy relaxation times. The measurements also demonstrate that these devices provide an ultra-sensitive tool with sub-ps response time for the characterization of ultrashort (similar to ps) mid-infrared pulses in the pJ-regime such as those generated by modelocked quantum cascade lasers. (c) 2005 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available