Abstract-Mid-infrared beam splitter for ultrashort pulses

Carmine Somma, Klaus Reimann, Michael Woerner, Thomas Kiel, Kurt Busch, Andreas Braun, Mathias Matalla, Karina Ickert, and Olaf Krüger

https://www.osapublishing.org/ol/abstract.cfm?uri=ol-42-15-2918&origin=search

A design is presented for a beam splitter suitable for ultrashort pulses in the mid-infrared and terahertz spectral range consisting of a structured metal layer on a diamond substrate. Both the theory and experiment show that this beam splitter does not distort the temporal pulse shape.

© 2017 Optical Society of America

Abstract-Phase-resolved two-dimensional terahertz spectroscopy including off-resonant interactions beyond the χ(3) limit

Carmine Somma1, Giulia Folpini1, Klaus Reimann1, Michael Woerner1,a) and Thomas Elsaesser1


1 Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, 12489 Berlin, Germany
a) Electronic mail: woerner@mbi-berlin.de
J. Chem. Phys. 144, 184202 (2016); http://dx.doi.org/10.1063/1.4948639

http://scitation.aip.org/content/aip/journal/jcp/144/18/10.1063/1.4948639

We present the first two-dimensional (2D) terahertz (THz) experiment with three phase-locked THz pulses and a fully phase-resolved detection of the nonlinearly emitted field by electrooptic sampling. In a prototype experiment we study the ultrafast dynamics of nonlinear two-phonon and two-photon interbandcoherences in the narrow-gap semiconductor InSb. Due to the extraordinarily large optical interband dipole of InSb the experiments were performed in the strongly nonperturbative regime of light-matter interaction allowing for impulsive off-resonant excitation of both two-phonon coherences and two-photoninterband coherences, the ultrafast dynamics of which is experimentally observed as a function of the waiting time in the three-pulse 2D experiment. Our novel three-pulse 2D THz spectroscopy paves the way for the detailed investigation of nonlinear quantum coherences in solids and holds potential for an extension to other systems.

Abstract-Ultra-broadband terahertz pulses generated in the organic crystal DSTMS

Carmine Somma, Giulia Folpini, Jyotsana Gupta, Klaus Reimann, Michael Woerner, and Thomas Elsaesser
https://www.osapublishing.org/ol/abstract.cfm?uri=ol-40-14-3404#Abstract

Electric-field transients covering the extremely wide frequency range from 0.5 to 26 THz are generated in the organic nonlinear crystal 4-N,N-dimethylamino-4′-N′-methylstilbazolium 2,4,6-trimethylbenzenesulfonate (DSTMS). Parametric difference frequency mixing within the spectrum of 25-fs amplified pulses centered at 800 nm provides a highly stable broadband output with an electric-field amplitude of up to several hundred kilovolts/cm. The high stability of the terahertz pulse parameters allows for sensitive phase-resolved broadband spectroscopy of optically thick crystalline samples.

© 2015 Optical Society of America

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