Compact internal sensing phase locking system for coherent combining of fiber laser array

Long, Jinhu; Chang, Hongxiang; Zhang, Yu‐Qiu; Hou, Tianyue; Chang, Qi; Su, Rongtao; Ma, Yanxing; Ma, Pengfei; Zhang, Pu

doi:10.1016/j.optlastec.2021.107775

Cited by 15 publications

(13 citation statements)

References 44 publications

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“…We first drive the LCs to compensate for the phase differences among the emitted OPA based on interference measurements [49] , and then shift the emitted OPA phase with the same value, as shown in Fig. 5(a), which is equivalent to the case of l = 0.…”

Section: Results Of Emitting the Oam Beammentioning

confidence: 99%

“…However, the system is bulky due to using large-aperture optical devices. Additionally, thermal effects can significantly impact phase control, which limits their practical applications [49] . Owing to the advantages of the internal phase-sensing technique, which can effectively suppress dynamic phase noise and enable the programmable LCs to form desired phase structures [45,49] , the high-power OAM beam can be easily generated through effective thermal management.…”

Section: Methods and Experimental Setupmentioning

confidence: 99%

“…Additionally, thermal effects can significantly impact phase control, which limits their practical applications [49] . Owing to the advantages of the internal phase-sensing technique, which can effectively suppress dynamic phase noise and enable the programmable LCs to form desired phase structures [45,49] , the high-power OAM beam can be easily generated through effective thermal management. Meanwhile, the compactness of the internal phase-sensing system allows for constructing a packageable OAM beam emitter.…”

Section: Methods and Experimental Setupmentioning

confidence: 99%

“…Second, the dynamic phase noise was detected and locked by the PMs based on the signal of the PD. Third, based on interference measurements [49] , the LC driver drove LCs to compensate for the phase differences among the emitted elements array; fourth, the LCs were dynamically driven in real time to shift piston phases of the emitted elements array to generate OAM beams [45] .…”

Section: Methods and Experimental Setupmentioning

confidence: 99%

“…Additionally, the system's compact design enables it to function as a packageable OAM beam emitter. In the experiment, when the dynamic phase noise is compensated based on the stochastic parallel gradient descent (SPGD) algorithm [47,48] , the programmable liquid crystals (LCs) are applied for synchronously shifting the piston phase of the OPA [45,49] . As a result, we present (to our best knowledge) the first effective generation of over 1.5 kW mode-programmable OAM beam in a continuouswave domain.…”

Section: Introductionmentioning

confidence: 99%

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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

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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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Section: Results Of Emitting the Oam Beammentioning

confidence: 99%