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)


Robust orthogonal parameterization of evolution strategy for adaptive laser pulse shaping

(full pdf)

Aliakbar Jafarpour, Janne Savolainen, Rianne de Jong, Jacob Middag, Daan P. Spr√ľnken, Peter van der Walle, Di Yang, and Jennifer L. Herek
Optics Express
Vol. 17, No. 14 p11986-12000 july 1, 2009

Many spectroscopic applications of femtosecond laser pulses
require properly-shaped spectral phase profiles. The optimal phase profile
can be programmed on the pulse by adaptive pulse shaping. A promising
optimization algorithm for such adaptive experiments is evolution strategy
(ES). Here, we report a four fold increase in the rate of convergence and ten
percent increase in the final yield of the optimization, compared to the direct
parameterization approach, by using a new version of ES in combination
with Legendre polynomials and frequency-resolved detection. Such a fast
learning rate is of paramount importance in spectroscopy for reducing the
artifacts of laser drift, optical degradation, and precipitation.
©2009 Optical Society of America
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