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Second Harmonic Generation in Optical Fibers
Optical Society of America Annual Meeting, 1990Intensive investigation has followed the surprising observation of self-organized second-harmonic generation (SHG) in optical fibers. It is now known that an alternating χ(2) grating has formed in the fiber. The grating grows by mixing of the fundamental and harmonic waves so SHG gratings can be formed quickly by seeding with a coherent second-harmonic
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Modulational instability in second-harmonic generation
Optics Letters, 1995We show that the eigenmodes of the two-wave interaction in a dispersive quadratic medium are unstable with respect to periodic perturbations. This mechanism represents a novel kind of modulational instability that involves the spontaneous generation of sideband pairs around both the fundamental and the second-harmonic frequencies.
S, Trillo, P, Ferro
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Second-harmonic generation of polarization singularities
Optics Letters, 2002Second-harmonic generation was studied theoretically for the vector singularities (daisy modes) of linearly polarized light and for the elliptic singularities (C points) of elliptically polarized light. Topological charge doubling for C points and daisy modes, similar to that found for vortices, was found.
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Second Harmonic Generation in Powder Laser
CLEO/Europe Conference on Lasers and Electro-Optics, 1998A laser-like emission from powders of solid state luminophosphors was reported in a number of publications, see for example Refs. [1,2]. A dramatic narrowing of Nd emission line (4F3/2-4I11/2) in powders of Nd doped laser materials is observed when the pumping energy exceeds some critical threshold value.
M. A. Noginov +4 more
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Giant second-harmonic generation in ferroelectric NbOI2
Nature Photonics, 2022Ibrahim Abdelwahab +13 more
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1991
In optical second-harmonic generation coherent optical radiation of frequency 2ω is generated, through the use of a medium with the appropriate nonlinear susceptibility, from incident coherent optical radiation of frequency ω. For the process to take place efficiently, the phase matching condition (colinear geometry) $$ k(2\omega ) = 2k(\omega ) $$
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In optical second-harmonic generation coherent optical radiation of frequency 2ω is generated, through the use of a medium with the appropriate nonlinear susceptibility, from incident coherent optical radiation of frequency ω. For the process to take place efficiently, the phase matching condition (colinear geometry) $$ k(2\omega ) = 2k(\omega ) $$
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Near-field second-harmonic generation
Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 2004Near-field microscopy of second-harmonic generation combines high surface sensitivity of the nonlinear optical process and high spatial resolution of the near-field optics. It enables investigation of nonlinear optical phenomena at the nanoscale and provides an opportunity to develop a highly sensitive optical technique for materials characterization ...
Anatoly V, Zayats, Igor I, Smolyaninov
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Optimization of second-harmonic generation microscopy
Micron, 2001We describe the principles and characteristics of second-harmonic generation imaging (SHGI) and explore various methods for optimization of the technique. Second-harmonic imaging is optimized for ultrashort laser pulses, high numerical aperture microscope objectives, a highly sensitive non-descanned large area detector, pseudo-phase-matching, and ...
R, Gauderon, P B, Lukins, C J, Sheppard
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Oscillations and quantized second-harmonic generation
Physical Review A, 1988We investigate quantum-mechanical second-harmonic generation for parameters such that classical electrodynamics predicts oscillations. Specifically we calculate the Q distribution function in a Gaussian approximation about the classical limit cycle. In the classical limit initial rapid collapse of the Q distribution into the neighborhood of the limit ...
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Tunable non-integer high-harmonic generation in a topological insulator
Nature, 2021Rupert Huber, Jan Wilhelm, Jens Gudde
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