By Hanieh Fattahi
This thesis bargains an intensive and informative examine of high-power, high-energy optical parametric chirped pulse amplifications platforms, the basis of the subsequent new release of femtosecond laser know-how. ranging from the fundamentals of the linear techniques concerned and the fundamental layout issues, the writer in actual fact and systematically describes a few of the must haves of the nonlinear optical structures anticipated to force attosecond physics within the coming decade. during this context, he supplies an summary of tools for producing the broadband and carrier-envelope-phase sturdy seed pulses worthwhile for generating managed electric-field waveforms within the ultimate approach; presents a advisor to dealing with the high-power, high-energy pump lasers required to spice up the heartbeat strength to the specified working variety; describes the layout of the nonlinear optical procedure used to accomplish the amplification, together with modes of operation for ultra-broadband infrared-visible pulses or narrowband (yet nonetheless ultrafast) pulses tunable over a number of octaves; and at last offers a potential high-energy box synthesizer established upon those innovations. As such, this paintings is vital analyzing for all scientists attracted to using the latest new release of ultrafast systems.
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Example text
Efficiency 1 is the net increase in signal energy divided by the input pump energy and efficiency 2 is the sum of the net increase in signal energy plus the idler energy divided by the input pump energy Conclusion The signal-to-pump energy ratio is a crucial parameter in an OPCPA, as it directly affects the amplification gain, conversion efficiency and the level of superfluorescence. Based on the analytical study in this section, it is shown that this parameter influences the gain behavior of broadband OPCPA dramatically.
Diode-pumped ytterbium-doped (Yb-doped) thin-disk lasers are reliable, costeffective, and power-scalable sources of high-energy 1-ps-scale laser pulses. These characteristics make them suitable sources for pumping OPCPA systems. In what follows, the feasibility of a few-cycle OPCPA and a tunable OPCPA based on diodepumped Yb-doped thin-disk lasers are discussed, while Chaps. 5 and 6 cover the detailed study of few-cycle OPCPA and subcycle light waveforms. Fundamental-Pumped OPCPA Three types of phase-matching schemes can be used to amplify a broadband spectrum supporting ultra-short intense pulses, utilizing near-1-ps pulses centered at the fundamental wavelength of 1030 nm: collinear, noncollinear and quasi phase-matched.
21 Generation of widely tunable femtosecond pulses. a Scheme for generating spectrally and temporally tunable pulses at any wavelength. The seed pulses are stretched to a significantly longer duration than that of the pump pulse. Amplification in a simple OPCPA setup yields pulses that can spectrally be tuned by changing the temporal delay between pump and seed pulse. b Amplified spectra of a widely tunable two-stage OPCPA system obtained from simulations. Millijoule-level, sub-40-fs pulses, tunable from 445 to 2750 nm, can be generated by using different harmonics of a 10 kHz Yb:YAG regenerative amplifier.