Generation of Spatially Coherent Light at Extreme Ultraviolet Wavelengths
Generation of Spatially Coherent Light at Extreme Ultraviolet Wavelengths
We present spatial coherence measurements of extreme-ultraviolet light generated using the process of high-harmonic upconversion of a femtosecond laser. Using a phase-matched hollow-fiber geometry, the generated beam is found to exhibit essentially full spatial coherence. The coherence of this laser-like EUV source is demonstrated by recording Gabor holograms of small …