Separation of coherent and incoherent nonlinearities in a heterodyne pump-probe experiment | Zendy

Paola Borri | Zendy; F. Romstad | Zendy; W. Langbein | Zendy; Anthony E. Kelly | Zendy; Jesper Mørk | Zendy; J. M. Hvam | Zendy

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Separation of coherent and incoherent nonlinearities in a heterodyne pump-probe experiment

Author(s) -

Paola Borri,

F. Romstad,

W. Langbein,

Anthony E. Kelly,

Jesper Mørk,

J. M. Hvam

Publication year - 2000

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.7.000107

Subject(s) - optics , heterodyne detection , heterodyne (poetry) , physics , transient (computer programming) , four wave mixing , optical amplifier , nonlinear optics , amplifier , signal (programming language) , laser , optoelectronics , acoustics , computer science , cmos , programming language , operating system

We demonstrate that the transient coherent nonlinearity (coherent artifact) affecting the pump-probe response of semiconductor optical amplifiers can be experimentally separated from the incoherent transient. The technique is based on measuring the mirror component of the coherent artifact which is a background-free four--wave mixing signal at a different frequency with respect to the transmitted probe in a heterodyne detection scheme. Measurements on amplifiers of different length reveal strong deviations from the commonly expected symmetric shape of the coherent artifact in case of long waveguides.

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