Tuning of the harmonic wavelength by varying the driving radiation wavelength, chirp, and intensity during the interaction of Ti:sapphire laser radiation with preformed laser plasma and solid surfaces was studied. High-order harmonics (HHG) were studied at different spectral, phase, and intensity characteristics of femtosecond radiation. Analysis of the variation of the high-order harmonic distribution in the case of different plumes is presented. We show that the tuning of harmonic wavelength allows achievement of resonance enhancement of single harmonics in the plateau distribution of HHG.
© 2007 Optical Society of America
Original Manuscript: August 22, 2006
Revised Manuscript: December 20, 2006
Manuscript Accepted: December 22, 2006
Published: April 17, 2007
Rashid A. Ganeev, Prasad Anant Naik, Himanshu Singhal, Juzer Ali Chakera, Parshotam Dass Gupta, and Hiroto Kuroda, "Tuning of the high-order harmonics generated from laser plasma plumes and solid surfaces by varying the laser spectrum, chirp, and focal position," J. Opt. Soc. Am. B 24, 1138-1143 (2007)