Single-harmonic enhancement by controlling the chirp of the driving laser pulse during high-order harmonic generation from GaAs plasma

Harmonic generation in laser-produced plasmas containing atoms, ions and clusters: a review

“…During the following few years, enormous improvements in the characteristics of this process were reported. A substantial increase in the highest order of the generated harmonics, the emergence of a plateau in the energy distribution of highestorder harmonics, the high efficiencies obtained with several plasma formations, the realisation of resonance-induced enhancement of individual harmonics, the efficient harmonic enhancement for the plasma plumes containing clusters of different materials and other features revealed in these and other works [24][25][26][27][28][29][30][31][32][33][34] have demonstrated the advantages of using specially prepared plasmas for HHG.…”

Why plasma harmonics?

“…Resonantly enhanced harmonics observed in several plasma media allowed expecting that similar conditions will be discovered using other plasma formations. The generated harmonic wavelength may then be tuned to the transitions with a high oscillator strength by wavelength tuning of the driving laser [54,65], as well as by varying the chirp of laser radiation [62,64]. The yield of harmonics in the XUV can be also enhanced by application of the ablated nanoparticles and clusters, currently widely available for various purposes.…”

Ultra-intense Laser Plasma Interaction Studies at RRCAT, Indore

“…The latter was varied by simply enhancement of some particular harmonic orders. We have studied high order harmonic generation [6][7][8][9] in plasma plumes and observed resonant enhancement 10), 11) and extinction 11) of some single harmonics simply by changing the separation between the two compressor gratings. It was observed that the harmonic spectrum shifts towards shorter frequencies if we introduce negative chirp in the laser pulse and vice versa.…”