S. Kohlweyer et al., HARMONIC-GENERATION FROM SOLID-VACUUM INTERFACE IRRADIATED AT HIGH LASER INTENSITIES, Optics communications, 117(5-6), 1995, pp. 431-438
Observations of harmonic generation from solid Al targets irradiated a
t intensities of 10(17) W/cm(2) using a tabletop Ti:sapphire terawatt
laser system are reported. For irradiances with laser light at a wavel
ength of lambda = 794 nm (the fundamental frequency), harmonics up to
the 7th, while for irradiances with frequency doubled laser light (lam
bda = 397) nm harmonics up to the 4th of the respective incident radia
tion were detected.