Presentation Information
[23p-13N-3]Macroscopic High-order Harmonic Generation with Single- and Sub-Cycle Pulses
〇(P)Rambabu Rajpoot1,2, Kaito Nishimiya1,2, Eiji J. Takahashi1,2 (1.Ultrafast Coherent Soft X-ray Photonics Research Team, RAP, RIKEN, Wako, Japan, 2.Extreme Laser Science Laboratory, CPR, RIKEN, Wako, Japan)
Keywords:
High Harmonic Generation,Subcycle Lasers,Attosecond Pulses
Owing to the significant advancements in ultrashort laser pulse production, the generation of high-energy infrared or mid-infrared laser pulses consisting of one or fewer optical cycles has become feasible. High-order harmonic generation (HHG) is a non-perturbative nonlinear process in laser-matter interaction that has been extensively utilized as a coherent light source in XUV and soft X-ray regimes, offering attosecond temporal resolution on tabletop setups.
In this context, we provide an in-depth theoretical investigation of macroscopic HHG in helium gas illuminated by the single- and sub-cycle laser pulses. The calculated HHG spectra are quasi-continuous independent of the CEP value. Additionally, the harmonics have very good spatial coherence, and their half-divergence angles are within 0.5 mrad. These high harmonics with great spatiotemporal coherence can be utilized to generate an intense isolated attosecond pulse in the soft X-ray regime.
In this context, we provide an in-depth theoretical investigation of macroscopic HHG in helium gas illuminated by the single- and sub-cycle laser pulses. The calculated HHG spectra are quasi-continuous independent of the CEP value. Additionally, the harmonics have very good spatial coherence, and their half-divergence angles are within 0.5 mrad. These high harmonics with great spatiotemporal coherence can be utilized to generate an intense isolated attosecond pulse in the soft X-ray regime.