Title :
Energy scaling of high-order harmonics in soft X-ray region
Author :
Midorikawa, Katsumi ; Takahashi, Eisuke ; Nabekawa, Yasuo
Author_Institution :
Laser Technol. Lab., RIKEN, Saitama
Abstract :
The advent of ultrashort high-peak power lasers enables us to investigate a variety of phenomena of high-field interaction with atom or ions. High-order harmonic generation (HHG) is one of such interesting phenomena. HHG can produce ultrashort coherent extreme ultraviolet (EUV) pulses from a compact laser system. This emission source is useful for EUV nonlinear optics and attosecond physics, and EUV spectroscopy. We investigated the energy scaling of the HHG. The efficiency and the spatial quality of high-order harmonics under phase-matched conditions strongly depend on the target gas density, the interaction length, and the pump laser focusing geometry. Based on our model calculation, a focusing geometry was designed to deliver several tens mJ pump pulses into a 100-mm-long interaction cell
Keywords :
X-ray production; optical harmonic generation; optical phase matching; optical pulse generation; Gaussian-like profile; absolute output energy; chirped pulse amplification; compact laser system; conversion efficiency; energy scaling; energy yield; high-order harmonics; interaction length; phase-matching; pump laser focusing geometry; quantum efficiency; soft X-ray region; spatial quality; spectral responsively; spectrally resolved far-field profiles; target gas density; two-dimensional fluorescence; ultrashort coherent EUV pulses; Atom lasers; Atomic beams; Gas lasers; Geometrical optics; Laser theory; Optical harmonic generation; Power lasers; Pump lasers; Ultraviolet sources; X-ray lasers;
Conference_Titel :
Lasers and Electro-Optics Society, 2001. LEOS 2001. The 14th Annual Meeting of the IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-7105-4
DOI :
10.1109/LEOS.2001.968905
