Wavefront Analysis of Nonlinear Self-Amplified Spontaneous-Emission Free-Electron Laser Harmonics in the Single-Shot Regime

Journal Article · Wed Jun 08 00:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.106.234801· OSTI ID:1040535

Bachelard, R; Chubar, O; Mercere, P; Idir, M; Couprie, M E; Lambert, G; Zeitoun, Ph; Kimura, H; Ohashi, H; Higashiya, A; Yabashi, M; Nagasono, M

The single-shot spatial characteristics of the vacuum ultraviolet self-amplified spontaneous emission of a free electron laser (FEL) is measured at different stages of amplification up to saturation with a Hartmann wavefront sensor. We show that the fundamental radiation at 61.5 nm tends towards a single-mode behavior as getting closer to saturation. The measurements are found in good agreement with simulations and theory. A near diffraction limited wavefront was measured. The analysis of Fresnel diffraction through the Hartmann wavefront sensor hole array also provides some further insight for the evaluation of the FEL transverse coherence, of high importance for various applications.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE SC OFFICE OF SCIENCE (SC)
• DOE Contract Number: DE-AC02-98CH10886
• OSTI ID: 1040535
• Report Number(s): BNL-96459-2011-JA; PRLTAO; 39KC02000; TRN: US201210%%711
• Journal Information: Physical Review Letters, Vol. 106, Issue 23; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
AMPLIFICATION
DIFFRACTION
EVALUATION
FREE ELECTRON LASERS
HARMONICS
RADIATIONS
SATURATION
SENSORS