K G H Baldwin et al 2000 J. Opt. B: Quantum Semiclass. Opt. 2 470 doi:10.1088/1464-4266/2/4/303
K G H Baldwin1,4, M D Bott2, H-A Bachor2 and P B Chapple3
Show affiliationsObservation of laser-induced continuum structure (LICS) in sodium due to the coupling of a bound state to the continuum by a strong laser field has been reported elsewhere. Such experiments have mostly employed a single laser photon to probe the structured continuum from the ground state. Other experiments have used multiphoton (third harmonic) probe schemes, but only one of these has successfully observed LICS, in agreement with theoretical predictions. We report here a very similar experiment generating third-harmonic radiation in sodium to probe the anticipated LICS produced by coupling the 5s state to the p continuum. However, under no conditions was any continuum structure observed, in agreement with in a number of other experiments, but at variance with theoretical predictions.
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
42.60.Fc Modulation, tuning, and mode locking
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
42.60.Lh Efficiency, stability, gain, and other operational parameters
Issue 4 (August 2000)
Received 21 March 2000
K G H Baldwin et al 2000 J. Opt. B: Quantum Semiclass. Opt. 2 470
S Nishida et al 2008 J. Phys.: Conf. Ser. 119 062039
Danny N Axford and Jason J Davis 2007 Nanotechnology 18 145502
Jinwu Ye 2008 EPL 82 16001
Mikhail Chester and Arpad Horvath 2010 Environ. Res. Lett. 5 014003
R L Herman 1990 J. Phys. A: Math. Gen. 23 2327
Patricia Kenzelmann et al 2009 IOP Conf. Ser.: Earth Environ. Sci. 6 452017
R L Herman 1990 J. Phys. A: Math. Gen. 23 4719
R L Herman 1991 J. Phys. A: Math. Gen. 24 1161
R L Herman 1990 J. Phys. A: Math. Gen. 23 1063