Enhancement of second-order vortex harmonics in polar molecular media

Abstract

The propagation of a few-cycle Laguerre-Gaussian (LG) beam through polar molecular media as well as the accompanied harmonic radiation is theoretically investigated under the condition of two-photon resonance. The results show that a second-order harmonic vortex harmonic occurs due to the inversion symmetry breaking of polar media, which is obviously enhanced during nonlinear propagation as a consequence of long-tail-generation. In addition, the LG 20 -like field distribution in the transverse plane perpendicular to the propagation direction is sensitively dependent on the carrier-envelope phase of the incident few-cycle LG beam.

Nonlinear optical rectification of GaAs/Ga1–x Al x As quantum dots with Hulth-en plus Hellmann confining potential

“…Light modulators can modulate phase and intensity of emitted light. [10,11] These optical devices mainly use the second-order and third-order nonlinear optical effects. In addition, nonlinear optical effects also have important applications in the field of information communication.…”

The second harmonic generation in GaAs/GaAlAs spherical quantum dots under Woods-Saxon plus attractive inversely quadratic potential

“…Unlike traditional linear optics, which use a relatively weak common light source, nonlinear optics uses lasers with high intensity as a light source, which breaks many traditional laws in the propagation process of linear optics, resulting in changes in light frequency, mutual transfer of light energy, and changes in the spatial distribution of outgoing light [9,10]. A series of special nonlinear optical effects of materials under the action of laser are of great significance to the research of laser technology, the development of spectroscopy, and the analysis of material structure [11][12][13].…”

Effects of hydrostatic pressure and temperature on refractive index changes in tuned quantum dots under magnetic field

“…These quantum effects can be used to develop optical communication quantum devices with new functions. They are widely favored by people because of their low transmission loss, great broadband, antielectromagnetic interference, transmission quality number, good confidentiality, and so on [11][12][13][14]. Consequently, the development of the semiconductor materials industry has always been one of the focuses of research.…”