scholarly journals Spontaneous 2D modulation instability in second harmonic generation process

2011 ◽  
Vol 284 (5) ◽  
pp. 1401-1404 ◽  
Author(s):  
Michaël Delqué ◽  
Gil Fanjoux ◽  
Simon-Pierre Gorza ◽  
Marc Haelterman
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Modulation Instability ◽  
Second Harmonic ◽  
Generation Process

Dynamic computer-generated nonlinear optical holograms in a non-collinear second-harmonic generation process

2018 ◽  
Vol 43 (14) ◽  
pp. 3236 ◽  
Author(s):  
Haigang Liu ◽  
Xiaohui Zhao ◽  
Hui Li ◽  
Yuanlin Zheng ◽  
Xianfeng Chen
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Generation Process

scholarly journals Scalar time domain modeling and coupling of second harmonic generation process in GaAs discontinuous optical waveguide

2008 ◽  
Vol 16 (19) ◽  
pp. 14496 ◽  
Author(s):  
A. Massaro ◽  
V. Tasco ◽  
M. T. Todaro ◽  
R. Cingolani ◽  
M. De Vittorio ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Optical Waveguide ◽  
Harmonic Generation ◽  
Time Domain ◽  
Second Harmonic ◽  
Generation Process ◽  
Domain Modeling ◽  
Time Domain Modeling

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.

Size Dependence of Second Harmonic Generation in Cdse Nanocrystals

1999 ◽  
Vol 571 ◽  
Author(s):  
M. Jacobsohn ◽  
U. Banin
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Rayleigh Scattering ◽  
Size Dependence ◽  
Second Harmonic ◽  
Particle Surface ◽  
Harmonic Coefficient ◽  
Cdse Nanocrystals ◽  
Generation Process ◽  
Nanocrystal Quantum Dots

ABSTRACTSecond Harmonic Generation in CdSe nanocrystal quantum dots is observed by Hyper-Rayleigh scattering. We use a Ti-Sapphire femtosecond laser at 820 nm to induce the nonlinear optical response of the nanocrystals in solution. The unit cell normalized second harmonic coefficient βn, shows a substantial systematic enhancement in small sizes. The observed size dependence of the second harmonic generation process, is explained assuming two contributions. The first is a bulk-like contribution, from the non-centrosymmetric nanocrystal core, and the second, a contribution from the particle surface. The latter contribution is most significant in small nanocrystals with a substantial proportion of surface atoms.

2D Spatial Modulation Instability in Second Harmonic Generation Scheme

2010 ◽  
Author(s):  
Michaël Delqué ◽  
Gil Fanjoux ◽  
Fabrice Devaux ◽  
Hervé Maillotte ◽  
Simon-Pierre Gorza ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Modulation Instability ◽  
Second Harmonic ◽  
Spatial Modulation
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