Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter at the nanoscale. We do this by exploring ways to shape light and its environment. It's what we call active and passive control. Our current focus is on the interaction of light with biomolecules and nanostructures. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.
We participate in the EU-COST actions MP1102: Coherent Raman microscopy (MicroCor) and CM1202: Supramolecular photocatalytic water splitting (PERSPECT-H2O)


Investigation of adaptive laser pulse shaping by direct estimation of group delay profile

(full pdf)

Di Yang, Daan P. Spr√ľnken, Alexander C.W. van Rhijn, Janne Savolainen, Ting Lee Chen, Herman L. Offerhaus, Jennifer L. Herek and Aliakbar Jafarpour
Optics Communications
Vol. 284 Issue 15 p2748-2758 march 14, 2011

We investigate the benefits of estimating the group delay spectrum (as opposed to the phase spectrum) on the performance of an adaptive laser pulse shaping experiment. We use both numerical and experimental approaches, and consider different figures of merit such as efficiency, noise robustness, convergence speed, repeatability, fitness sensitivity, and parameter insensitivity. While primarily focused on the process of broadband second harmonic generation, we also study a resonant third order nonlinear process. Our results show an overall superiority of delay-based formulation in the cases under study (compared to a conventional phase-based formulation) for adaptive laser pulse shaping.
© 2011 Elsevier B.V. All rights reserved.
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