Vortex terahertz wave generation in air by femtosecond optical vortex pulses

Maksym Ivanov; Illia Thiele; Luc Berge; Stefan Skupin; Danas Buožius; Virgilijus Vaičaitis

doi:10.1117/12.2529247

6 September 2019 Vortex terahertz wave generation in air by femtosecond optical vortex pulses

Maksym Ivanov, Illia Thiele, Luc Berge, Stefan Skupin, Danas Buožius, Virgilijus Vaičaitis

Proceedings Volume 11124, Terahertz Emitters, Receivers, and Applications X; 111240B (2019) https://doi.org/10.1117/12.2529247
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

This proceeding details the experimental investigation and scheme used to generate vortex beams at THz and far-infrared frequencies. Main experimental and numrical results are presented by M. Ivanov et al.^{1, 2} We investigate the generation of broadband terahertz (THz) pulses between 10 and 40 THz with a phase singularity from two-color femtosecond laser-induced gas-plasmas. Experimental scheme allows for independent control of the amplitude, phase, polarization, and longitudinal and transverse positions of fundamental and second harmonics. When the second harmonic beam has a vortex charge the THz beam acquires an azimuthal phase modulation as well. Moreover, it turns out that also the THz intensity becomes modulated along the azimuthal angle. The phase structure of the singular THz beam is indirectly revealed by astigmatic transformation of the beam by a cylindrical mirror and additionally confirmed by the vortex THz beam behaviour upon change of relative phase between the fundamental and the second harmonic.

Conference Presentation

Citation Download Citation

Maksym Ivanov, Illia Thiele, Luc Berge, Stefan Skupin, Danas Buožius, and Virgilijus Vaičaitis "Vortex terahertz wave generation in air by femtosecond optical vortex pulses", Proc. SPIE 11124, Terahertz Emitters, Receivers, and Applications X, 111240B (6 September 2019); https://doi.org/10.1117/12.2529247

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