Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter. Our current focus is on detection and sensing/imaging with an emphasis on the development of integrated photonics. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.


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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