Abstract
We predict a variety of new phenomena, that includes the spontaneous
nucleation of multiple vortex twins, vortex rotation and drift,
vortex-antivortex interaction and annihilation, and formation of
quasi-aligned patterns of single-charge vortices. We consider cw light
propagation in a bulk quadratic nonlinear crystal under conditions for
type I second-harmonic generation. We restrict ourselves to
up-conversion geometries with material and light conditions that yield
negligible depletion of the pump fundamental frequency (FF) beam. Then,
the second-harmonic (SH) beam is dictated by an inhomogeneous linear
partial differential equation whose general solution can be obtained by
means of the Green function approach. In the case of un-seeded
geometries (i.e., no SH input light), and in absence of Poynting vector
walk-off between the FF and SH beams, sum- and difference-charge
arithmetic operations have been predicted and observed experimentally.
However, a new range of phenomena is discovered in seeded geometries and
with Poynting vector walk-off. In particular, in the case of seeded
schemes without walk-off, our numerical and experimental investigations
show the spontaneous nucleation of multiple-vortex twins. In such case,
the number of vortices present in the SH beam and its total topological
charge varies with the propagation distance inside the crystal.
Original language | English |
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Title of host publication | IEEE Lasers and Electro-Optics Society 12th Annual Meeting, LEOS '99 |
Place of Publication | Piscataway, NJ |
Publisher | Institute of Electrical and Electronics Engineers (IEEE) |
Pages | 588-589 |
Number of pages | 2 |
ISBN (Print) | 0780356349 |
DOIs | |
Publication status | Published - 1999 |
Externally published | Yes |
Event | 12th Annual Meeting of the IEEE Lasers and Electro-Optics Society 1999 - San Francisco, United States Duration: 8 Nov 1999 → 11 Nov 1999 Conference number: 12 |
Publication series
Name | Proceedings - Lasers adn Electro-Optics Society Annual Meeting |
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Publisher | IEEE |
ISSN (Print) | 1092-8081 |
Conference
Conference | 12th Annual Meeting of the IEEE Lasers and Electro-Optics Society 1999 |
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Abbreviated title | LEOS '99 |
Country/Territory | United States |
City | San Francisco |
Period | 8/11/99 → 11/11/99 |