scholarly journals Extreme ultraviolet polarization vortex beam based on high harmonic generation

2020 ◽  
Vol 69 (4) ◽  
pp. 044203
Author(s):  
Xin Fan ◽  
Hong-Jing Liang ◽  
Li-Yu Shan ◽  
Bo Yan ◽  
Qing-Hua Gao ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Vortex Beam ◽  
Polarization Vortex

scholarly journals Electron quantum path control in high harmonic generation via chirp variation of strong laser pulses

2021 ◽  
Author(s):  
Stylianos Petrakis ◽  
Makis Bakarezos ◽  
Michael Tatarakis ◽  
Emmanouil Benis ◽  
Nektarios Papadogiannis
Keyword(s):  
Laser Pulse ◽  
Ultraviolet Light ◽  
Harmonic Generation ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Ultrafast Laser ◽  
Temporal Window ◽  
Electron Quantum ◽  
Extreme Ultraviolet Light

Abstract The quantum phases of the electron paths driven by an ultrafast laser in high harmonic generation in an atomic gas depends linearly on the instantaneous cycle-averaged laser intensity. Using high laser intensities, a complete single ionisation of the atomic gas may occur before the laser pulse peak. Therefore, high harmonic generation could be localized only in a temporal window at the leading edge of laser pulse envelope. Varying the laser frequency chirp of an intense ultrafast laser pulse, the centre, and the width of the temporal window, that the high harmonic generation phenomenon occurs, could be controlled with high accuracy. This way, both the duration and the phase of the electron trajectories, that generate efficiently high harmonics, is fully controlled. An accurate and robust method of spectral control and selection of the high harmonic extreme ultraviolet light from distinct quantum paths is experimentally demonstrated. Furthermore, a phenomenological numerical model enlightens the physical processes that take place. This novel approach of the electron quantum path selection via laser chirp is a simple and versatile way of controlling the time-spectral characteristics of the coherent extreme ultraviolet light with future applications in the fields of attosecond pulses and soft x-ray nano-imaging.

scholarly journals Extreme Ultraviolet Fractional Orbital Angular Momentum Beams from High Harmonic Generation

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Alex Turpin ◽  
Laura Rego ◽  
Antonio Picón ◽  
Julio San Román ◽  
Carlos Hernández-García
Keyword(s):  
Angular Momentum ◽  
Harmonic Generation ◽  
Orbital Angular Momentum ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
High Harmonic Generation

scholarly journals Quasi-supercontinuum source in the extreme ultraviolet using multiple frequency combs from high-harmonic generation

2017 ◽  
Vol 25 (6) ◽  
pp. 6936 ◽  
Author(s):  
Martin Wünsche ◽  
Silvio Fuchs ◽  
Stefan Aull ◽  
Jan Nathanael ◽  
Max Möller ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Multiple Frequency ◽  
Frequency Combs

Extreme ultraviolet mask observations using a coherent extreme ultraviolet scatterometry microscope with a high-harmonic-generation source

2015 ◽  
Vol 54 (6S1) ◽  
pp. 06FC01 ◽  
Author(s):  
Takahiro Fujino ◽  
Yusuke Tanaka ◽  
Tetsuo Harada ◽  
Yutaka Nagata ◽  
Takeo Watanabe ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
High Harmonic Generation
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