Second harmonic generation of laser beams in transverse mode locking states

Zhang, Zilong; Gao, Yuan; Li, Xiangjia; Wang, Xin; Zhao, Shufan; Liu, Qiang; Zhao, Changming

doi:10.1117/1.ap.4.2.026002

Cited by 23 publications

(12 citation statements)

References 42 publications

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“…We thus envision that this work will inspire the creation of ultra-compact flat nanophotonic elements for wavelength division demultiplexing, OAM optical communication demultiplex devices, and shaping structured light. 54,55…”

Section: Experimental Methodsmentioning

confidence: 99%

Multiwavelength high-order optical vortex detection and demultiplexing coding using a metasurface

et al. 2022

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Orbital angular momentum (OAM) of an optical vortex has attracted great interest from the scientific community due to its significant values in high-capacity optical communications such as mode or wavelength division multiplexer/demultiplexer. Although several configurations have been developed to demultiplex an optical vortex, the multiwavelength high-order optical vortex (HOOV) demultiplexer remains elusive due to lack of effective control technologies. In this study, we present the design, fabrication, and test of metasurface optical elements for multiwavelength HOOV demultiplexing based on optical gyrator transformation transformations in the visible light range. Its realization in a metasurface form enables the combined measurement of OAM, the radial index p, and wavelength using a single optical component. Each wavelength channel HOOV can be independently converted to a high-order Hermitian-Gaussian beam mode, and each of the OAM beams is demultiplexed at the converter output. Furthermore, we extend the scheme to realize encoding of the three-digit gray code by controlling the wavelength or polarization state. Experimental results obtained at three wavelengths in the visible band exhibit good agreement with the numerical modeling. With the merits of ultracompact device size, simple optical configuration, and HOOV recognition ability, our approach may provide great potential applications in photonic integrated devices and systems for high-capacity and demultiplex-channel OAM communication.

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Section: Experimental Methodsmentioning

confidence: 99%

Multiwavelength high-order optical vortex detection and demultiplexing coding using a metasurface

et al. 2022

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“…Meanwhile, for the intracavity nonlinear process of structured laser beams, some studies also showed similar properties, while more complex and diverse beam patterns can be obtained 146 – 150 …”

Section: Introductionmentioning

confidence: 92%

“…In addition, investigations on the SHG structured laser beams in the TML states have been carried out. 149 Through a sandwich-like microchip laser composed of Nd:YAG, Cr:YAG, and LTO crystals in Fig. 9(d1), complex and diverse structured beams in TML states and their SHG beams were generated by altering the pumping parameters.…”

Section: Intracavity Nonlinear Processesmentioning

confidence: 99%

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Evolution on spatial patterns of structured laser beams: from spontaneous organization to multiple transformations

Wang

Zhang

et al. 2023

Adv. Photon. Nexus

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Spatial patterns are a significant characteristic of lasers. The knowledge of spatial patterns of structured laser beams is rapidly expanding, along with the progress of studies on laser physics and technology. Particularly in the last decades, owing to the in-depth attention on structured light with multiple degrees of freedom, the research on spatial and spatiotemporal structures of laser beams has been promptly developed. Such beams have hatched various breakthroughs in many fields, including imaging, microscopy, metrology, communication, optical trapping, and quantum information processing. Here, we would like to provide an overview of the extensive research on several areas relevant to spatial patterns of structured laser beams, from spontaneous organization to multiple transformations. These include the early theory of beam pattern formation based on the Maxwell-Bloch equations, the recent eigenmodes superposition theory based on the time-averaged Helmholtz equations, the beam patterns extension of ultrafast lasers to the spatiotemporal beam structures, and the structural transformations in the nonlinear frequency conversion process of structured beams.

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“…HG modes have a rectangular symmetry and are defined by the indices of m and n along x - and y -directions, respectively. To generate high-quality HG and LG modes, many useful methods based on spatial phase modulator (SLM), laser cavity, − and nonlinear optic process have been proposed. The applications of these spatial modes − have recently been extended to a diffractive deep neural network .…”

Section: Introductionmentioning

confidence: 99%

Spatially Structured-Mode Multiplexing Holography for High-Capacity Security Encryption

et al. 2023

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Holography has been widely used in optical displays, high-security optical encryption, and optical artificial intelligence. Optical multiplexing technologies by utilizing various dimensions of light effectively expand the information capacity and density for holography. In this work, we propose and experimentally demonstrate a novel spatially structured-mode multiplexing holography with the assistance of deep learning algorithms. In the experiment, we utilize Hermite−Gaussian (HG) and Laguerre−Gaussian (LG) modes for example as decoding channels of various holographic images. The results prove that these spatial modes work well as a multiplexing dimension in addition to wavelength, polarization, and orbital angular momentum (OAM) of light. In addition, by designing a specifically computed hologram, multiple spatial modes can be superposed together to compose a single decoding channel, which can significantly enhance the capacity and security for holographic encryption. Our work provides a promising scheme for high-capacity computational holography and information encryption.

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Second harmonic generation of laser beams in transverse mode locking states

Cited by 23 publications

References 42 publications

Multiwavelength high-order optical vortex detection and demultiplexing coding using a metasurface

Multiwavelength high-order optical vortex detection and demultiplexing coding using a metasurface

Evolution on spatial patterns of structured laser beams: from spontaneous organization to multiple transformations

Spatially Structured-Mode Multiplexing Holography for High-Capacity Security Encryption

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