Felicity: Spatiotemporal characterization of few-cycle laser pulses

In this paper we apply a broadband fiber optic coupler interferometer to the measurement of few-cycle laser pulses. Sub-8-fs pulses delivered by an ultrafast oscillator were characterized spatiotemporally using STARFISH, which is based on spatially resolved spectral interferometry. The reference pulse was measured with the d-scan technique. The pulses were focused by an off-axis parabolic mirror and were characterized at different transverse planes along the focusing region. The evolution of the retrieved pulses is analyzed, exhibiting small variations in the temporal (and spectral) amplitude and phase during propagation. Finally, the peak irradiance evolution is estimated from the integration of the spatiotemporal intensity.

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-16-17880

Marta: Laser Nanofabrication of Soft Matter

Laser based techniques constitute an advantageous versatile approach for the assembly and control at nanometer scale of polymers and biopolymers, fundamental components of soft matter. In this chapter lasernanostructuring of thin films of these materials will be illustrated by studies on laser induced periodic surface structures (LIPSS) and on laser foaming and on their respective application for surface enhanced Raman spectroscopy (SERS) based sensors and for scaffolds in tissue engineering.

Nacho: Time of flight mass spectrometry characterization of plasma plumes

a short presentation about my work on TOF-MS in Madrid and what a did here as well

Rashid: Plasma Harmonics, 2 years of study

Marta Castillejo: Harmonic Generation for Diagnosis of Ablation Plasma Plumes

Malte2: Design and Characterisation of a mid-IR SPIDER

Malte2 will talk about his project he worked on over the summer. The incarnation of a spider for the mid-IR...

slides here: http://charles.qols.ph.ic.ac.uk/~twitting/consJCDM/material/20121009_Malte2_mid-IR-twinspider/SPIDER%20Presentation.pptx

Seb: Oriented Rotational Wave-Packet Dynamics Studies via High Harmonic Generation

Phys. Rev. Lett. 109, 113901 (2012) [5 pages]

Oriented Rotational Wave-Packet Dynamics Studies via High Harmonic Generation

Abstract

References

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E. Frumker^1,2,3,*, C. T. Hebeisen¹, N. Kajumba^1,4, J. B. Bertrand¹, H. J. Wörner^1,5, M. Spanner⁶, D. M. Villeneuve¹, A. Naumov¹, and P. B. Corkum^1,†
1Joint Attosecond Science Laboratory, University of Ottawa and National Research Council of Canada, 100 Sussex Drive, Ottawa, ON K1A 0R6, Canada
²Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
³Department of Physics, Texas A&M University, College Station,Texas 77843, USA
⁴Department für Physik der Ludwig-Maximilians-Universität, Schellingstrasse 4, D-80799 Munich, Germany
⁵Laboratorium für physikalische Chemie, ETH Zürich, Wolfgang-Pauli-Strasse 10, 8093 Zürich, Switzerland
⁶Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, ON K1A 0R6, Canada

Received 12 April 2012; published 12 September 2012

We produce oriented rotational wave packets in CO and measure their characteristics via high harmonic generation. The wave packet is created using an intense, femtosecond laser pulse and its second harmonic. A delayed 800 nm pulse probes the wave packet, generating even-order high harmonics that arise from the broken symmetry induced by the orientation dynamics. The even-order harmonic radiation that we measure appears on a zero background, enabling us to accurately follow the temporal evolution of the wave packet. Our measurements reveal that, for the conditions optimum for harmonic generation, the orientation is produced by preferential ionization which depletes the sample of molecules of one orientation.

Published by the American Physical Society

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.109.113901

DOI:

10.1103/PhysRevLett.109.113901

PACS:

42.65.Ky, 07.57.-c