Multipass laser cavity for efficient transverse illumination of an elongated volume

Jan Vogelsang, Marc Diepold, Aldo Antognini, Andreas Dax, Johannes Götzfried, Theodor W. Hänsch, Franz Kottmann, Julian J. Krauth, Yi Wei Liu, Tobias Nebel, Francois Nez, Karsten Schuhmann, David Taqqu, Randolf Pohl

Research output: Contribution to JournalArticleAcademicpeer-review


A multipass laser cavity is presented which can be used to illuminate an elongated volume from a transverse direction. The illuminated volume can also have a very large transverse cross section. Convenient access to the illuminated volume is granted. The multipass cavity is very robust against misalignment, and no active stabilization is needed. The scheme is suitable for example in beam experiments, where the beam path must not be blocked by a laser mirror, or if the illuminated volume must be very large. This cavity was used for the muonic-hydrogen experiment in which 6 μm laser light illuminated a volume of 7×25×176mm3, using mirrors that are only 12mm in height. We present our measurement of the intensity distribution inside the multipass cavity and show that this is in good agreement with our simulation.

Original languageEnglish
Pages (from-to)13050-13062
Number of pages13
JournalOptics Express
Issue number11
Publication statusPublished - 1 Jan 2014


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