Results 261 to 270 of about 10,053,327 (300)
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Squeezed states in second-harmonic generation
Optics Letters, 1983We consider the process of second-harmonic generation with the nonlinear crystal placed in a resonant cavity. Both the fundamental and the second-harmonic mode are shown to exhibit squeezing. An analysis is made for the general values of the ratio between the damping constants of the two modes.
L A, Lugiato, G, Strini, F D, Martini
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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 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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Second-harmonic generation imaging of cancer
2014The last 30 years has seen great advances in optical microscopy with the introduction of sophisticated fluorescence-based imaging methods such as confocal and multiphoton laser scanning microscopy. There is increasing interest in using these methods to quantitatively examine sources of intrinsic biological contrast including autofluorescent endogenous ...
Adib, Keikhosravi +3 more
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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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Second-harmonic generation in AlGaAs nanoantennas
Photonics and Fiber Technology 2016 (ACOFT, BGPP, NP), 2016We demonstrate monolithic aluminum gallium arsenide (AlGaAs) optical nanoantennas for enhanced second harmonic generation (SHG) at telecom wavelengths. From measurements on nanocylinders of 400 nm height and varying radius pumped with femtosecond pulses delivered at 1554-nm wavelength, we estimated a peak conversion efficiency exceeding 10−5.
DE ANGELIS, Costantino +11 more
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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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Simple model of second-harmonic generation
Physical Review B, 1992A model for second-harmonic generation from materials with inversion symmetry is developed. The reflecting medium is treated as an ordered array of localized, polarizable entities and the self-consistent relations between induced multipole moments and local fields are derived.
, Schaich, , Mendoza
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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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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) $$ k(2\omega ) = 2k(\omega ) $$
openaire +1 more source