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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 11 — Jun. 3, 2013
  • pp: 13040–13051

Micro-focusing of attosecond pulses by grazing-incidence toroidal mirrors

L. Poletto, F. Frassetto, F. Calegari, S. Anumula, A. Trabattoni, and M. Nisoli  »View Author Affiliations

Optics Express, Vol. 21, Issue 11, pp. 13040-13051 (2013)

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The design of optical systems for micro-focusing of extreme-ultraviolet (XUV) attosecond pulses through grazing-incidence toroidal mirrors is presented. Aim of the proposed configuration is to provide a micro-focused image through a high demagnification of the XUV source with the following characteristics: i) almost negligible aberrations; ii) long exit arm to easily accommodate at the output the experimental setups required for the applications of the focused attosecond pulses; iii) possibility to have an intermediate region where the XUV beam is collimated, in order to insert a plane split-mirror for the generation of two XUV pulse replicas to be used in a XUV-pump/XUV-probe setup. We present the analytical and numerical study of two optical configurations characterized by two sections based on the use of toroidal mirrors. The first section provides a demagnified image of the source in an intermediate focus that is free from defocusing but has a large coma aberration. The second section consists of a relay mirror that is mounted in Z-shaped geometry with respect to the previous one, in order to give a stigmatic image with a coma that is opposite to that provided by the first section. An example is provided to demonstrate the capability to achieve spot sizes in the 5-15 μm range with a demagnification higher than 10 in a compact envelope.

© 2013 OSA

OCIS Codes
(080.1010) Geometric optics : Aberrations (global)
(320.7160) Ultrafast optics : Ultrafast technology
(340.7480) X-ray optics : X-rays, soft x-rays, extreme ultraviolet (EUV)
(080.4035) Geometric optics : Mirror system design

ToC Category:
Optical Design and Fabrication

Original Manuscript: March 25, 2013
Revised Manuscript: April 26, 2013
Manuscript Accepted: May 6, 2013
Published: May 20, 2013

L. Poletto, F. Frassetto, F. Calegari, S. Anumula, A. Trabattoni, and M. Nisoli, "Micro-focusing of attosecond pulses by grazing-incidence toroidal mirrors," Opt. Express 21, 13040-13051 (2013)

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