Abstract
We propose a method for spectrally filtering radiation in the VUV wavelength range by means of a monochromator constituted by a cell filled with a resonantly absorbing rare gas. Around particular wavelengths, the gas exhibits narrow-bandwidth absorbing resonances following the Fano profile. In particular, within the photon energy range 60 eV-65 eV, the correlation index of the Fano profiles for the photoionization spectra in Helium is equal to unity, meaning that the minimum of the cross-section is exactly zero. For sufficiently large column density in the gas cell, the spectrum of the incoming radiation will be attenuated by the background cross-section of many orders of magnitude, except for those wavelengths close to the point where the cross-section is zero. Remarkable advantages of a gas monochromator based on this principle are simplicity, efficiency and narrow-bandwidth. A gas monochromator installed in the experimental hall of a VUV SASE FEL facility would enable the delivery of a single-mode VUV laser beam. The design is identical to that of already existing gas attenuator systems for VUV or X-ray FELs. We present feasibility study and exemplifications for the FLASH facility in the VUV regime. (orig.)
Geloni, Gianluca;
[1]
Kocharyan, Vitali;
Saldin, Evgeni
[2]
- European XFEL GmbH, Hamburg (Germany)
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Citation Formats
Geloni, Gianluca, Kocharyan, Vitali, and Saldin, Evgeni.
Gas-filled cell as a narrow bandwidth bandpass filter in the VUV wavelength range.
Germany: N. p.,
2011.
Web.
Geloni, Gianluca, Kocharyan, Vitali, & Saldin, Evgeni.
Gas-filled cell as a narrow bandwidth bandpass filter in the VUV wavelength range.
Germany.
Geloni, Gianluca, Kocharyan, Vitali, and Saldin, Evgeni.
2011.
"Gas-filled cell as a narrow bandwidth bandpass filter in the VUV wavelength range."
Germany.
@misc{etde_21430143,
title = {Gas-filled cell as a narrow bandwidth bandpass filter in the VUV wavelength range}
author = {Geloni, Gianluca, Kocharyan, Vitali, and Saldin, Evgeni}
abstractNote = {We propose a method for spectrally filtering radiation in the VUV wavelength range by means of a monochromator constituted by a cell filled with a resonantly absorbing rare gas. Around particular wavelengths, the gas exhibits narrow-bandwidth absorbing resonances following the Fano profile. In particular, within the photon energy range 60 eV-65 eV, the correlation index of the Fano profiles for the photoionization spectra in Helium is equal to unity, meaning that the minimum of the cross-section is exactly zero. For sufficiently large column density in the gas cell, the spectrum of the incoming radiation will be attenuated by the background cross-section of many orders of magnitude, except for those wavelengths close to the point where the cross-section is zero. Remarkable advantages of a gas monochromator based on this principle are simplicity, efficiency and narrow-bandwidth. A gas monochromator installed in the experimental hall of a VUV SASE FEL facility would enable the delivery of a single-mode VUV laser beam. The design is identical to that of already existing gas attenuator systems for VUV or X-ray FELs. We present feasibility study and exemplifications for the FLASH facility in the VUV regime. (orig.)}
place = {Germany}
year = {2011}
month = {Apr}
}
title = {Gas-filled cell as a narrow bandwidth bandpass filter in the VUV wavelength range}
author = {Geloni, Gianluca, Kocharyan, Vitali, and Saldin, Evgeni}
abstractNote = {We propose a method for spectrally filtering radiation in the VUV wavelength range by means of a monochromator constituted by a cell filled with a resonantly absorbing rare gas. Around particular wavelengths, the gas exhibits narrow-bandwidth absorbing resonances following the Fano profile. In particular, within the photon energy range 60 eV-65 eV, the correlation index of the Fano profiles for the photoionization spectra in Helium is equal to unity, meaning that the minimum of the cross-section is exactly zero. For sufficiently large column density in the gas cell, the spectrum of the incoming radiation will be attenuated by the background cross-section of many orders of magnitude, except for those wavelengths close to the point where the cross-section is zero. Remarkable advantages of a gas monochromator based on this principle are simplicity, efficiency and narrow-bandwidth. A gas monochromator installed in the experimental hall of a VUV SASE FEL facility would enable the delivery of a single-mode VUV laser beam. The design is identical to that of already existing gas attenuator systems for VUV or X-ray FELs. We present feasibility study and exemplifications for the FLASH facility in the VUV regime. (orig.)}
place = {Germany}
year = {2011}
month = {Apr}
}