Generation of optical vortex lattices by a coherent beam combining system

Long, Jinhu; Hou, Tianyue; Chang, Qi; Yu, Tao; Su, Rongtao; Ma, Pengfei; Ma, Yanxing; Zhang, Pu; Liu, Si

doi:10.1364/ol.425186

Cited by 29 publications

(16 citation statements)

References 36 publications

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“…In the conventional CBC system for generating the OVB, the phases differences of the laser beam array can be compensated to be 0 or an integer multiple of 2π during the phase locking. The desired phases structures can be generated by the conjugated phase shifts of the LCs [41] or SLM [32]. The phase locking system is complicated.…”

Section: Methodsmentioning

confidence: 99%

“…Whereas, as a promising study, few has been reported about generating and manipulating the OVBA with the piston phase array via the CBC technique. In our previous work, we preliminarily proposed and experimentally demonstrated an architecture for creating the OVBA based on the CBC system [41]. The hexagonal close-packed OVBA consists of spatially distributed OAM beams could be generated effectively.…”

Section: Introductionmentioning

confidence: 99%

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Customizing optical vortex beams array by coherent beam combining technique

Long

Chen

Hou

et al. 2022

5th Optics Young Scientist Summit (OYSS 2022)

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In this paper, an innovation coherent beam combining (CBC) architecture to generate the structured light beams array was proposed and experimented. The simulation and experimental results reveal that the optical vortex beams array (OVBA) with multi-modes can be generated effectively in the far field. The OVBA is composed of multiple sub-OVB in the intensity distribution. Furthermore, the number of OVBs can be modulated by changing the fill factor of the laser array in the near field. In particular, the performance of a OVBA copier was observed, which may deepen the understanding of creating the structured light fields by CBC technique. The experiment results were in excellent agreement with the simulation results. This work could provide valuable and practical reference on generation and manipulation of high power structured light beams.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Customizing optical vortex beams array by coherent beam combining technique

Long

Chen

Hou

et al. 2022

5th Optics Young Scientist Summit (OYSS 2022)

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“…Прогрессия может быть возрастающей по модулю каждого члена, убывающей или стационарной. Первый член прогрессии имеет вид a k exp[-(r / w) 2 + ikm], последний член прогрессии a n exp[-(r / w) 2 + inm], знаменатель прогрессии a exp(im. Параметры семейства оптических вихрей: целые числа (k, n, m) и действительное число a. Если a < 1, то прогрессия убывающая и ТЗ суперпозиции равен топологическому заряду первого члена прогрессии (TC = km, k < n), так как первый член описывает оптический вихрь с наибольшей мощностью в суперпозиции.…”

Section: заключениеunclassified

“…Например, в [1] экспериментально исследовались цилиндрические векторные пространственновременные оптические вихри. В [2] предложена оптическая схема для генерации 2D-решетки оптических вихрей. В [3] экспериментально создана 3D-решетка оптических вихрей.…”

Section: Introductionunclassified

Topological charge of superposition of optical vortices described by a geometric sequence

Kotlyar¹,

Kovalev²

2022

Computer Optics

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Here, we investigate coaxial superpositions of Gaussian optical vortices that can be described by a geometric sequence. For all superpositions analyzed, a topological charge (TC) is derived. In the initial plane, the TC can be either integer or half-integer, acquiring an integer value upon free-space propagation of the light field. Generally, the geometric sequence of optical vortices (GSOV) has three integer parameters and one real parameter. Values of these four parameters define the TC of the GSOV. Upon free-space propagation, the intensity pattern of the GSOV is not conserved, but can have intensity petals whose number is equal to one of the four beam parameters. If the GSOV has a unit real parameter, all constituent angular harmonics in the superposition have the same weight. In this case, the TC of the superposition is equal to the average index of the constituent angular harmonics. For instance, if the TC of the first and of the last angular harmonics, respectively, equals k and n, then the total TC of the superposition in the initial plane will be (n + k) /2, becoming equal to n upon free-space propagation.

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“…The fast OAM mode switching can be realized with the electric phase modulators [37] , and the response frequency is over several gigahertz. The technique of generating the OAM beam with an OPA via the CBC technique has been significantly investigated [36,37,[42][43][44][45] . Both a single OAM beam and the OAM beam array could be generated effectively with the OPA [46] .…”

Section: Introductionmentioning

confidence: 99%

High-power mode-programmable orbital angular momentum beam emitter with an internally sensed optical phased array

Long,

Deng,

Gao

et al. 2024

中国光学快报

Self Cite

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The high-power mode-programmable orbital angular momentum (OAM) beam has attracted significant attention in a wide range of applications, such as long-distance optical communication, nonlinear frequency conversion, and beam shaping. Coherent beam combining (CBC) of an optical phased array (OPA) can offer a promising solution for both generating the high-power OAM beam and rapidly switching the OAM modes. However, achieving real-time phase noise locking and formation of desired phase structures in a high-power CBC system faces significant challenges. Here, an internal phase-sensing technique was utilized to generate the high-power OAM beam, which effectively mitigated thermal effects and eliminated the need for large optical devices. An OPA with six elements was employed for experimental demonstration. The first effective generation of over 1.5 kW mode-programmable OAM beam in a continuous-wave domain was presented. Moreover, the results demonstrated that the generated OAM beam could be modulated with multiple dimensions. The topological charge can be switched in real time from −1 to −2. Notably, this OAM beam emitter could function as an OAM beam copier by easily transforming a single OAM beam into an OAM beam array. More importantly, a comprehensive analysis was conducted on power scaling, mode switching speed, and expansion of OAM modes. Additionally, the system's compact design enabled it to function as a packageable OAM beam emitter. Owing to the advantages of having high power and programmable modes with multiple dimension modulation in phase structures and intensity distribution, this work can pave the way for producing high-power structured light beams and advancing their applications.

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Generation of optical vortex lattices by a coherent beam combining system

Cited by 29 publications

References 36 publications

Customizing optical vortex beams array by coherent beam combining technique

Customizing optical vortex beams array by coherent beam combining technique

Topological charge of superposition of optical vortices described by a geometric sequence

High-power mode-programmable orbital angular momentum beam emitter with an internally sensed optical phased array

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