Conservation of the spin angular momentum in second-harmonic generation with elliptically polarized vortex beams

2019 ◽  
Vol 114 (10) ◽  
pp. 101101 ◽  
Author(s):  
Tianyu Liu ◽  
Bing Gu ◽  
Guanghao Rui ◽  
Changgui Lv ◽  
Jun He ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Spin Angular Momentum ◽  
Vortex Beams ◽  
Elliptically Polarized

scholarly journals Arbitrary orbital angular momentum addition in second harmonic generation

2014 ◽  
Vol 16 (9) ◽  
pp. 093041 ◽  
Author(s):  
W T Buono ◽  
L F C Moraes ◽  
J A O Huguenin ◽  
C E R Souza ◽  
A Z Khoury
Keyword(s):  
Angular Momentum ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Orbital Angular Momentum ◽  
Second Harmonic

scholarly journals Orbital angular momentum mixing in type II second harmonic generation

2017 ◽  
Author(s):  
L J. Pereira ◽  
W. T. Buono ◽  
D. S. Tasca ◽  
K. Dechoum ◽  
A. Z. Khoury
Keyword(s):  
Angular Momentum ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Orbital Angular Momentum ◽  
Second Harmonic ◽  
Type Ii

scholarly journals Second-harmonic generation of asymmetric Bessel-Gaussian beams carrying orbital angular momentum

2020 ◽  
Vol 28 (2) ◽  
pp. 2536 ◽  
Author(s):  
Kunjian Dai ◽  
Wenzhe Li ◽  
Kaitlyn S. Morgan ◽  
Yuan Li ◽  
J. Keith Miller ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Orbital Angular Momentum ◽  
Second Harmonic ◽  
Gaussian Beams

scholarly journals Second-harmonic generation and the conservation of spatiotemporal orbital angular momentum of light

2020 ◽  
Author(s):  
Guan Gui ◽  
Nathan Brooks ◽  
Henry Kapteyn ◽  
Margaret Murnane ◽  
Chen-Ting Liao
Keyword(s):  
Angular Momentum ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Orbital Angular Momentum ◽  
Topological Charge ◽  
Second Harmonic ◽  
Space Time ◽  
Generation Process ◽  
Space And Time ◽  
Phase Singularities

Abstract Light with spatiotemporal orbital angular momentum (ST-OAM) is a recently discovered type of structured electromagnetic field with characteristic space-time spiral phase structure and transverse OAM. In this work, we present the first generation and characterization of the second-harmonic of ST-OAM pulses. By uncovering the conservation of transverse OAM in a second-harmonic generation process, where the space-time topological charge of the fundamental field is doubled along with the optical frequency, we establish a general nonlinear scaling rule— analogous to that describing the spatial topological charges associated with the conventional longitudinal OAM of light. Furthermore, we observe that the topology of a second-harmonic ST-OAM pulse can be modified by complex spatiotemporal astigmatism, giving rise to multiple phase singularities separated in space and time. Our finding thus confirms that a spatiotemporal phase winding, surrounding one or many phase singularities in space and time, can be interpreted as a new class of topological charge. Our study opens a new route for nonlinear conversion and scaling of light carrying ST-OAM with the potential for driving other secondary ST-OAM sources of electromagnetic fields, electron pulses, and beyond.

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