NDLI: Extreme nonlinear optical processes with beams carrying orbital angular momentum

Content Provider	IEEE Xplore Digital Library
Author	Kern, C. Zurch, M. Hansinger, P. Dreischuh, A. Spielmann, C.
Copyright Year	2013
Description	Author affiliation: Inst. of Opt. & Quantum Electron., Friedrich-Schiller-Univ. Jena, Jena, Germany (Kern, C.; Zurch, M.; Hansinger, P.; Spielmann, C.) \|\| Dept. of Quantum Electron., Sofia Univ., Sofia, Bulgaria (Dreischuh, A.)
Abstract	Summary form only given. Light beams carrying an isolated point singularity with a screw-type phase distribution are called an optical vortex (OV) (Fig 1). The fact that in free space the Poynting vector of the beam gives the momentum flow leads to an orbital angular momentum (OAM) of the photons in such a singular beam, independent on the spin angular momentum [1]. There are many applications of optical OAM shown in literature that would benefit from the availability of optical vortex beams in all spectral regions. For example it was shown that transitions forbidden by selection rules in dipole approximation appear allowed when using photons with the additional degree of freedom of optical OAM [2]. However, the common techniques of producing new light frequencies by nonlinear optical processes seem problematic in conserving the optical vortex when the nonlinearity becomes large.We show that with the extremely nonlinear process of High Harmonic Generation (HHG) it is possible to transfer OVs from the near-infrared to the extreme ultraviolet (XUV) [3] at wavelengths down to ~30 nm.We use a conventional HHG setup, where Harmonics down to the 27th are produced in Argon gas by exposing it to ultrashort 30 fs laser pulses at 800 nm wavelength. In order to impose a helical phase front onto these driving pulses, we used a spatial light modulator (Fig 2). The observed light of several plateau harmonics was examined spatially and spectrally, while also two different tools to investigate the phase structure were employed. The spatial profile showed the expected singular behaviour, a dark region in the centre, although two separate "lobes" of intensity were observed. A phase feature that showed a shift of on opposing sides of the beam profile was found with a wavefront splitting technique. A screw-like phase evolution around the profile was also verified by employing a Hartmann type measurement.The generated spectrum revealed that in all Harmonic orders an OV was present. The profile however looked the same in all orders, indicating identical topological charge, which runs counterintuitive to the assumption that the phase of is multiplied by the order of the nonlinearity.
Sponsorship	Eur. Phys. Soc.
Starting Page	1
Ending Page	1
File Size	229011
Page Count	1
File Format	PDF
e-ISBN	9781479905942
DOI	10.1109/CLEOE-IQEC.2013.6801162
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-05-12
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ultraviolet sources Optical vortices Measurement by laser beam Harmonic analysis Optical harmonic generation Laser beams Nonlinear optics
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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