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.

 

Single-shot fluctuations in waveguided high-harmonic generation

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S. J. Goh, Y. Tao, P. J. M. van der Slot, H. J. M. Bastiaens, J. Herek, S. G. Biedron, M. B. Danailov, S. V. Milton, and K.-J. Boller
Optics Express
Vol. 23, Issue 19, pp. 24888-24902 sept. 21, 2015
doi:10.1364/OE.23.024888

For exploring the application potential of coherent soft x-ray
(SXR) and extreme ultraviolet radiation (XUV) provided by high-harmonic
generation, it is important to characterize the central output parameters. Of
specific importance are pulse-to-pulse (shot-to-shot) fluctuations of the
high-harmonic output energy, fluctuations of the direction of the emission
(pointing instabilities), and fluctuations of the beam divergence and shape
that reduce the spatial coherence. We present the first single-shot
measurements of waveguided high-harmonic generation in a waveguided
(capillary-based) geometry. Using a capillary waveguide filled with Argon
gas as the nonlinear medium, we provide the first characterization of shotto-shot
fluctuations of the pulse energy, of the divergence and of the beam
pointing. We record the strength of these fluctuations vs. two basic input
parameters, which are the drive laser pulse energy and the gas pressure in
the capillary waveguide. In correlation measurements between single-shot
drive laser beam profiles and single-shot high-harmonic beam profiles we
prove the absence of drive laser beam-pointing-induced fluctuations in the
high-harmonic output. We attribute the main source of high-harmonic
fluctuations to ionization-induced nonlinear mode mixing during
propagation of the drive laser pulse inside the capillary waveguide.
©2015 Optical Society of America
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