Moving media: Second harmonic generation investigation

2016 ◽  
Vol 30 (22) ◽  
pp. 1650138
Author(s):  
Mahboubeh Ghalandari
Keyword(s):  
Electric Field ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Second Order ◽  
Phase Matching ◽  
Nonlinear Media ◽  
Quasi Phase Matching ◽  
Moving Media ◽  
Order Susceptibility

Because of the importance of second harmonic generation (SHG) in some nonlinear media, in this paper, we investigated induced SHG in diamond where there is no intrinsic second-order susceptibility, [Formula: see text]. The electric field is proposed to introduce moving susceptibility of the second-order and induce second harmonic generation. Then, spatiotemporal quasi-phase matching (QPM) is applied to optimize the induced SHG. Numerical results reveal that in this way, the induced second harmonic is found at the frequency of [Formula: see text] rather than [Formula: see text].

scholarly journals Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar Symmetry

2020 ◽  
Vol 10 (24) ◽  
pp. 9047
Author(s):  
Pierre Guillemé ◽  
Chiara Vecchi ◽  
Claudio Castellan ◽  
Stefano Signorini ◽  
Mher Ghulinyan ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Matching Condition ◽  
Second Order ◽  
Phase Matching ◽  
Zinc Blend ◽  
Quasi Phase Matching ◽  
Fabrication Defects ◽  
Phase Matching Condition

Microring resonators made of materials with a zinc-blend or diamond lattice allow exploiting their 4-bar symmetry to achieve quasi-phase matching condition for second-order optical nonlinearities. However, fabrication tolerances impose severe limits on the quasi-phase matching condition, which in turn degrades the generation efficiency. Here, we present a method to mitigate these limitations. As an example, we studied the geometry and the pump wavelength conditions to induce the second-harmonic generation in silicon-based microrings with a second-order susceptibility χzxy(2)≠0. We found the best compromises between performances and experimental requirements, and we unveil a strategy to minimize the impacts of fabrication defects. The method can be easily transferred to other material systems.

Continuous wave second-harmonic generation using domain-disordered quasi-phase matching waveguides

2009 ◽  
Vol 94 (15) ◽  
pp. 151107 ◽  
Author(s):  
Sean J. Wagner ◽  
Barry M. Holmes ◽  
Usman Younis ◽  
Amr S. Helmy ◽  
J. Stewart Aitchison ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Continuous Wave ◽  
Second Harmonic ◽  
Phase Matching ◽  
Quasi Phase Matching

Broadband Second-Harmonic Generation via Random Quasi-Phase-Matching in PPLT

2010 ◽  
Author(s):  
S. Stivala ◽  
A. C. Busacca ◽  
A. Pasquazi ◽  
R. L. Oliveri ◽  
R. Morandotti ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Phase Matching ◽  
Quasi Phase Matching

Beam-quality improved efficient second-harmonic generation in aperiodic quasi-phase-matching gratings

2001 ◽  
Vol 188 (1-4) ◽  
pp. 213-217 ◽  
Author(s):  
Tao Wang ◽  
Liejia Qian ◽  
Heyuan Zhu ◽  
Zhanjia Hou ◽  
Fuming Li
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Beam Quality ◽  
Phase Matching ◽  
Quasi Phase Matching

ENHANCING CONVERSION EFFICIENCY IN THE SECOND-ORDER NONLINEAR OPTICAL PHENOMENA

2004 ◽  
Vol 13 (03n04) ◽  
pp. 445-449
Author(s):  
JONGBAE KIM ◽  
JUNG JIN JU ◽  
MIN-SU KIM
Keyword(s):  
Harmonic Generation ◽  
Conversion Efficiency ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Second Order ◽  
Phase Matching ◽  
Quasi Phase Matching ◽  
Optical Phenomena ◽  
Nonlinear Optical Phenomena ◽  
Second Order Nonlinearity

The distributions of electric field and the induced second-order nonlinearity are discussed in a poling scheme where the width of a periodic electrode is shorter than the conventional coherent length. The theoretical aspects of quasi-phase matching for a subsequent experiment in second harmonic generation are analyzed. The present analysis consistently explains that the conversion efficiency can be enhanced if the electrode width is shortened, and maximized if the electrode width is optimized.

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