Frequency doubler and two-color mode of operation at free electron laser FLASH2

M. Kuhlmann; E. A. Schneidmiller; M. V. Yurkov

doi:10.1117/12.2265584

14 June 2017 Frequency doubler and two-color mode of operation at free electron laser FLASH2

M. Kuhlmann, E. A. Schneidmiller, M. V. Yurkov

Author Affiliations +

Proceedings Volume 10237, Advances in X-ray Free-Electron Lasers Instrumentation IV; 1023710 (2017) https://doi.org/10.1117/12.2265584
Event: SPIE Optics + Optoelectronics, 2017, Prague, Czech Republic

Abstract

We report on the results of the first operation of a frequency doubler at FLASH2. The scheme uses the feature of the variable gap of the undulator. Undulator is divided in two parts. The second part of the undulator is tuned to the double frequency of the first part. Modulated electron beam enters the second part of the undulator and generates radiation at the 2nd harmonic. Depending on a balance between the gain of undulator sections, frequency doubler allows operation in a two-color mode and operation at shorter wavelengths with respect to standard SASE scheme. The shortest wavelength of 3.1 nm (photon energy 400 eV) has been achieved at FLASH2 with frequency doubler scheme, which is significantly below the design value for the standard SASE option.

Citation Download Citation

M. Kuhlmann, E. A. Schneidmiller, and M. V. Yurkov "Frequency doubler and two-color mode of operation at free electron laser FLASH2", Proc. SPIE 10237, Advances in X-ray Free-Electron Lasers Instrumentation IV, 1023710 (14 June 2017); https://doi.org/10.1117/12.2265584

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