Switchable Second‐Harmonic Generation of Airy Beam and Airy Vortex Beam

Abstract

Airy beam and Airy vortex beam with intriguing characteristics have been extensively studied in linear optics, while their dynamic nonlinear conversion has rarely been explored and remains challenging. Here, through the collaboration of binary mask engineered nonlinear photonic crystal and space‐variant liquid‐crystal geometric phase element, second‐harmonic Airy beam and Airy vortex beam can be generated in a switchable manner. Electrical‐controlled loading of orbital angular momentum (OAM) into fundamental wave unlocks the flexibility of nonlinear process, which is well investigated in theory and further verified by experiment. Wavelength transformation, OAM conversion, and propagation trajectory inflection are realized simultaneously. This offers a convenient and universal strategy for dynamic nonlinear generation and shows great potentials in optical manipulation and information processing.

Recent Progress in Nonlinear Frequency Conversion of Optical Vortex Lasers

“…SHG of the vortex Airy beam was observed. In 2021, Liu et al [112] manages to control vortex characteristics in the Airy beam. Loading of OAM is controlled electrically, which showed great potential in information processing.…”

Multiparameter encrypted orbital angular momentum multiplexed holography based on multiramp helicoconical beams

“… – 8 OAM is represented as a spiral phase exp(ilφ), where l and φ are the topological charge (TC) and the azimuthal angle, respectively 9 . In the past three decades, different types of OAM beams, such as the Airy vortex beam, the Bessel vortex beam, and Pearcy vortex beam, have had vast applications in optical tweezers, optical images, and so on 10 – 12 In addition, the OAM can be used as an additional degree of freedom to improve the information capacity due to the orthogonality of OAM modes 13 , 14 …”

“…9 In the past three decades, different types of OAM beams, such as the Airy vortex beam, the Bessel vortex beam, and Pearcy vortex beam, have had vast applications in optical tweezers, optical images, and so on. [10][11][12] In addition, the OAM can be used as an additional degree of freedom to improve the information capacity due to the orthogonality of OAM modes. 13,14 Recently, OAM multiplexed holography has been demonstrated and experimentally implemented as an independent information channel that can preserve the OAM property and achieve the OAM selectivity in the reconstructed images.…”

Structured Light Laser Based on Intra-Cavity Modulation

“…They carry different topological charges which are orthogonal to each other [9][10][11], which provide a promising prospect for the expansion of the communication system [12]. (3) Imaging: Structured light can be employed in super-resolution imaging to boost the resolution of microscope systems beyond that of the imaging optics, such as confocal microscopes [13], two-photon microscopes [14], second-harmonic microscopes [15], third-harmonic microscopes [16], and dark field imaging [17,18]. (4) Processing: Vortex beams are generally utilized to manufacture chiral structures in metals.…”