Generation of high-energy high-order harmonics by use of a long interaction medium

Femtosecond filamentation in transparent media

“…Besides this fundamental aspect whose understanding should lead to energy upscaling of the single cycle pulses produced by filamentation, the generation of high harmonics in noble gases from a filament has been demonstrated from experiments and simulations (Tamaki et al, 1999(Tamaki et al, , 2000Tosa et al, 2003;Takahashi et al, 2003). In a 30 Torr Neon gas, it was shown that a phase-matched propagation of harmonics over 7 mm magnifies the conversion efficiency around the 49th harmonic (in the cutoff region) by 40 times and by more than 100 times in the cutoff region corresponding to a few nJ per high-harmonic pulse in the 76 eV region (Tamaki et al, 1999).…”

XUV multiphoton processes with intense high-order harmonics

“…4 shows the experimental setup for HHG using a long focusing pumping geometry. Details are described elsewhere [37]. Experiments were carried out with a 10 Hz Ti:sapphire laser producing an output of 200 mJ with a pulse width of 35 fs and a beam diameter of 50 mm.…”

Efficient generation of below-threshold harmonics for high-fidelity multi-photon physics in the VUV spectral range

“…In this Letter, motivated by previous findings on highharmonic energy scaling [20][21][22][23], we demonstrate the generation of intense, Ti:Sa fifth-harmonic pulses, utilizing a loose-focusing geometry in conjunction with a long generating medium. The schematic of the experimental setup is illustrated in Fig.…”