Title :
Two-photon resonant excitation of a doubly excited state in He atoms by high-harmonic pulses
Author :
Sekikawa, Taro ; Okamoto, Tatsuya ; Haraguchi, Eisuke ; Yamashita, Mikio ; Nakajima, Takashi
Author_Institution :
Dept. of Appl. Phys., Hokkaido Univ., Sapporo, Japan
Abstract :
We demonstrate the two-photon resonant excitation of the doubly excited 2p2 1S state in helium atoms by the combination of 29.5- and 32.6-eV harmonic photons. Our ab-initio calculation confirms the nonlinear excitation by high harmonics.
Keywords :
ab initio calculations; atom-photon collisions; helium; laser beams; optical harmonic generation; quantum optics; two-photon processes; He; ab-initio calculation; doubly excited state; electron volt energy 29.5 eV; electron volt energy 32.6 eV; helium atoms; high-harmonic generation; high-harmonic pulse; laser beam polarization; nonlinear excitation; two-photon resonant excitation; Atom optics; Electrons; Helium; Laser excitation; Nonlinear optics; Optical pulses; Power harmonic filters; Resonance; Spectroscopy; Ultrafast optics; (190.4160) Multiharmonic generation; (190.4180) Multiphoton processes;
Conference_Titel :
Lasers and Electro-Optics, 2009 and 2009 Conference on Quantum electronics and Laser Science Conference. CLEO/QELS 2009. Conference on
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-55752-869-8
Electronic_ISBN :
978-1-55752-869-8
