Conservation of angular momentum in second harmonic generation from under-dense plasmas
Abstract
Spin and orbital angular momentum of an optical beam are two independent parameters that exhibit distinct effects on mechanical objects. However, when laser beams with angular momentum interact with plasmas, one can observe the interplay between the spin and the orbital angular momentum. Here, by measuring the helical phase of the second harmonic 2ω radiation generated in an underdense plasma using a known spin and orbital angular momentum pump beam, we verify that the total angular momentum of photons is conserved and observe the conversion of spin to orbital angular momentum. We further determine the source of the 2ω photons by analyzing near field intensity distributions of the 2ω light. The 2ω images are consistent with these photons being generated near the largest intensity gradients of the pump beam in the plasma as predicted by the combined effect of spin and orbital angular momentum when Laguerre-Gaussian beams are used.
- Publication Date:
- Research Org.:
- Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE; National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR)
- OSTI Identifier:
- 1737392
- Grant/Contract Number:
- SC0010064; 1734315; FA9550-16-1-0139
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Communications Physics
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 1; Journal ID: ISSN 2399-3650
- Publisher:
- Springer Nature
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Laser-produced plasmas; Nonlinear optics; Plasma physics
Citation Formats
Huang, Chen-Kang, Zhang, Chaojie, Nie, Zan, Marsh, Kenneth A., Clayton, Chris E., and Joshi, Chandrashekhar. Conservation of angular momentum in second harmonic generation from under-dense plasmas. United States: N. p., 2020.
Web. doi:10.1038/s42005-020-00474-3.
Huang, Chen-Kang, Zhang, Chaojie, Nie, Zan, Marsh, Kenneth A., Clayton, Chris E., & Joshi, Chandrashekhar. Conservation of angular momentum in second harmonic generation from under-dense plasmas. United States. https://doi.org/10.1038/s42005-020-00474-3
Huang, Chen-Kang, Zhang, Chaojie, Nie, Zan, Marsh, Kenneth A., Clayton, Chris E., and Joshi, Chandrashekhar. Thu .
"Conservation of angular momentum in second harmonic generation from under-dense plasmas". United States. https://doi.org/10.1038/s42005-020-00474-3. https://www.osti.gov/servlets/purl/1737392.
@article{osti_1737392,
title = {Conservation of angular momentum in second harmonic generation from under-dense plasmas},
author = {Huang, Chen-Kang and Zhang, Chaojie and Nie, Zan and Marsh, Kenneth A. and Clayton, Chris E. and Joshi, Chandrashekhar},
abstractNote = {Spin and orbital angular momentum of an optical beam are two independent parameters that exhibit distinct effects on mechanical objects. However, when laser beams with angular momentum interact with plasmas, one can observe the interplay between the spin and the orbital angular momentum. Here, by measuring the helical phase of the second harmonic 2ω radiation generated in an underdense plasma using a known spin and orbital angular momentum pump beam, we verify that the total angular momentum of photons is conserved and observe the conversion of spin to orbital angular momentum. We further determine the source of the 2ω photons by analyzing near field intensity distributions of the 2ω light. The 2ω images are consistent with these photons being generated near the largest intensity gradients of the pump beam in the plasma as predicted by the combined effect of spin and orbital angular momentum when Laguerre-Gaussian beams are used.},
doi = {10.1038/s42005-020-00474-3},
journal = {Communications Physics},
number = 1,
volume = 3,
place = {United States},
year = {Thu Nov 19 00:00:00 EST 2020},
month = {Thu Nov 19 00:00:00 EST 2020}
}
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