14 June 2017 Frequency doubler and two-color mode of operation at free electron laser FLASH2
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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.
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M. Kuhlmann, M. Kuhlmann, E. A. Schneidmiller, E. A. Schneidmiller, M. V. Yurkov, 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); doi: 10.1117/12.2265584; https://doi.org/10.1117/12.2265584

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