Sökning: (L773:0277 786X OR L773:1996 756X) hsvcat:1 >
Generation of broad...
Generation of broadband THz beams with azimuthally modulated phase and intensity by femtosecond laser pulses in air plasma
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- Vaičaitis, Virgilijus (författare)
- Vilniaus universitetas,Vilnius University
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- Ivanov, Maksym (författare)
- Vilniaus universitetas,Vilnius University
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- Thiele, Illia, 1989 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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visa fler...
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- Buožius, Danas (författare)
- Vilniaus universitetas,Vilnius University
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- Juchnevičiūtė, Ivona (författare)
- Vilniaus universitetas,Vilnius University
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- Skupin, Stefan (författare)
- Université de Lyon
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- Bergé, Luc (författare)
- Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA),The French Alternative Energies and Atomic Energy Commission (CEA)
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visa färre...
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(creator_code:org_t)
- 2019
- 2019
- Engelska.
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - 0277-786X .- 1996-756X. ; 11370, s. 443-444
- Relaterad länk:
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https://research.cha...
Abstract
Ämnesord
Stäng
- We report efficient generation of the broadband terahertz (THz) radiation by bichromatic femtosecond laser pulses with flat phase fronts or with a phase singularity focused in air. As a pump source, the fundamental and second harmonic radiations of a femtosecond Ti:sapphire laser were used. While the fundamental laser beam had Gaussian intensity distribution and a flat phase front, the second harmonic beam had either flat or helical phase front forming an optical vortex. In both cases the angular spectra of THz radiation and azimuthal phase distributions of THz beams were investigated. It was found that when both the fundamental and second harmonic laser pulses had Gaussian profiles, the resulting THz radiation was generated as an axially symmetric cone with a flat phase front. However, when the Gaussian second harmonic beam was replaced by the one with optical singularity, the intensity and the phase of generated THz cone became modulated along the azimuthal angle. The spectrum of generated THz pulses spanned up to 50 THz in both cases. Our theoretical analysis based on the photocurrent model was in good agreement with the experimental data.
Ämnesord
- NATURVETENSKAP -- Fysik -- Acceleratorfysik och instrumentering (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Accelerator Physics and Instrumentation (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Nyckelord
- Terahertz radiation
- Laser created air plasma
- Femtosecond laser pulses
- Optical vortex
Publikations- och innehållstyp
- kon (ämneskategori)
- ref (ämneskategori)
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