Title :
Bright high-order harmonic generation from long gas jets toward coherent soft X-ray applications
Author :
Kim, H.T. ; Kim, I.J. ; Tosa, V. ; Kim, C.M. ; Park, J.J. ; Lee, Y.S. ; Bartnik, A. ; Fiedorowicz, H. ; Nam, C.H.
Author_Institution :
Dept. of Phys., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
Abstract :
We have performed the optimization of high-order harmonic brightness from long gas jets by using self-guided and chirped femtosecond laser pulses and analyzed their coherence properties. The characteristics of laser pulse propagation were analyzed both in theory and in experiments to understand the self-guiding process of laser pulses and chirp compensation mechanism. Highly efficient harmonic generation with low beam divergence and narrow bandwidth was achieved by applying these two techniques to the long gas jets. The coherence properties of the bright harmonics were examined using double-pinhole interference and spectral interference.
Keywords :
X-ray optics; X-ray spectra; brightness; high-speed optical techniques; jets; light coherence; light interferometry; optical harmonic generation; ultraviolet spectra; chirp compensation; chirped laser pulses; coherence properties; coherent soft X-ray applications; double-pinhole interference; extreme ultraviolet interferometry; femtosecond laser pulses; high-order harmonic brightness; high-order harmonic generation; laser pulse propagation; long gas jets; low beam divergence; self-guided laser pulses; self-guiding process; spectral interference; Brightness; Chirp; Frequency conversion; Gas lasers; Harmonic analysis; Interference; Laser theory; Optical pulses; X-ray applications; X-ray lasers;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2004.837739
