共查询到18条相似文献,搜索用时 343 毫秒
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全光纤激光阵列主动相位控制利用全光纤网络实现阵列激光的活塞相位内部探测与控制,具有结构紧凑、无需外部反馈光学器件和易于扩展等优点,是大阵元规模光纤激光相干合成重要发展方向之一。采用全光纤相位探测结构,介绍了全光纤激光阵列主动相位控制技术的系统原理和利用光纤耦合器实现相位锁定的过程,总结了全光纤激光阵列主动相位控制关键技术,通过优化算法实现全光纤激光阵列主动相位控制验证实验。探讨了在全光纤结构主动相位控制中π相位模糊问题及解决方法,给出了利用双波长探测实现消除π相位模糊问题的仿真结果。最后梳理了全光纤激光阵列主动相位控制研究现状,并从路数扩展、功率提升和应用等方面进行了展望。 相似文献
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利用三个2×2的光纤耦合器按一定规则联接成一个全光纤耦合环,该耦合环将三个独立的掺铒光纤激光器连成一个锁相阵列. 由于耦合环的引入,锁相阵列的整体损耗减小,且三个单元激光器之间可以进行有效的能量相互注入耦合,进而实现阵列的锁相输出. 实验中观察到的远场干涉图样和锁相前后的输出光谱均表明三路光纤激光器实现了相位锁定,当三路抽运源的功率均为100 mW时,获得了92 mW的稳定相干输出.
关键词:
光纤激光器
相干合成
光纤耦合器
相位锁定 相似文献
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介绍了本课题组近年来在基于空间结构内部锁相的光纤激光相干合成方面的研究工作,给出了空间结构内部锁相相干合成的基本原理,搭建了七路低功率光纤激光阵列实验系统,结果表明在内部相位噪声校正基础之上,可以稳定补偿外部相位差进而实现激光阵列同相位输出,验证了内部锁相方法的可行性。进一步介绍了空间结构内部锁相技术在目标在回路相干合成、阵列光束光场调控等方面的拓展应用,通过实验论证了空间结构内部锁相技术能够有效提升目标在回路相干合成系统的相位控制带宽,并在远场有效生成轨道角动量光束阵列,其拓扑荷数可从-1到+1切换。 相似文献
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《光学学报》2010,(10)
主动相位控制的光纤激光阵列相干合成在提高输出功率的同时能够保证良好的光束质量,其关键技术在于光纤激光相干阵列的锁相控制。基于随机并行梯度下降(SPGD)算法的锁相控制方案不仅具有控制策略简单、系统结构紧凑的优点,而且通过算法性能评价函数和迭代参数的选取,能够对光纤激光相干阵列进行多种锁相控制,从而得到各种形式的阵列合成光束输出,实现与自适应光子锁相元件整列(APPLE)系统阵列的有效契合。理论研究并实验实现了基于SPGD算法的相位控制方案的同相相干合成锁相控制、合成光束主极大偏转控制和空心光束产生等功能,验证了基于SPGD算法的全电光束控制在各种形态光束控制中的可行性。 相似文献
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基于随机并行梯度下降算法(SPGD)和现场可编程逻辑阵列(FPGA)设计制作了相干合成(CBC)相位控制器。理论分析表明,该控制器单次迭代速率大于1.125 MHz,对于2路和16路相干合成,其平均控制带宽的理论值分别大于70 kHz和9 kHz,与现有的SPGD算法相位控制器相比有了量级上的提高。利用该控制器进行了验证性实验,表明该控制器能够实现高速高精度相位控制。当利用相位控制器对两路激光的相位进行锁定时,目标圆孔内能量提高了1.51倍,远场光斑对比度提高了5.29倍。 相似文献
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Pu Zhou Zilun Chen Xiaolin Wang Xiao Li Zejin Liu Xiaojun Xu Jing Hou Zongfu Jiang 《中国光学快报(英文版)》2008,6(7)
We demonstrate a scalable architecture for coherent combining of pulsed fiber lasers.A new method for generating synchronous pulsed fiber lasers by direct phase modulation is proposed and investigated.It is shown that phase modulated mutually coupled laser array can be a steady synchronous pulsed fiber laser source.The synchronous pulsed fiber lasers are coherently combined with an invariable phase difference of π in adjacent lasers.Neither active phase control nor polarization control is taken in our experiment. 相似文献
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Coherent beam combination of adaptive fiber laser array with tilt-tip and phase-locking control 下载免费PDF全文
We present an experimental study on tilt-tip(TT) and phase-locking(PL) control in a coherent beam combination(CBC) system of adaptive fiber laser array.The TT control is performed using the adaptive fiber-optics collimator(AFOC),and the PL control is realized by the phase modulator(PM).Cascaded and simultaneous controls of TT and PL using stochastic parallel gradient descent(SPGD) algorithm are investigated in this paper.Two-fiber-laser-,four-fiber-laser-,and six-fiber-laser-arrays are employed to study the TT and PL control.In the cascaded control system,only one high-speed CMOS camera is used to collect beam data and a computer is used as the controller.In a simultaneous control system one high-speed CMOS camera and one photonic detector(PD) are employed,and a computer and a control circuit based on field programmable gate array(FPGA) are used as the controllers.Experimental results reveal that both cascaded and simultaneous controls of TT using AFOC and PL using PM in fiber laser array are feasible and effective.Cascaded control is more effective in static control situation and simultaneous control can be applied to the dynamic control system directly.The control signals of simultaneous PL and TT disturb each other obviously and TT and PL control may compete with each other,so the control effect is limited. 相似文献
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Cheung EC Ho JG Goodno GD Rice RR Rothenberg J Thielen P Weber M Wickham M 《Optics letters》2008,33(4):354-356
A diffractive optical element (DOE) is used as a beam combiner for an actively phase-locked array of fiber lasers. Use of a DOE eliminates the far-field sidelobes and the accompanying loss of beam quality typically observed in tiled coherent laser arrays. Using this technique, we demonstrated coherent combination of five fiber lasers with 91% efficiency and M2=1.04. Combination efficiency and phase locking is robust even with large amplitude and phase fluctuations on the input laser array elements. Calculations and power handling measurements suggest that this approach can scale to both high channel counts and high powers. 相似文献
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以半导体激光器中的复合腔模型和实测的分布反馈光纤激光器的外腔端面反射率为基础,对不同反射率条件下分布反馈光纤激光器的输出功率进行了仿真,同时搭建了二基元分布反馈光纤激光器阵列实验平台,对仿真结果进行了验证.仿真与实验结果表明:外腔反馈光重新注入分布反馈光纤激光器会增加激光器的输出功率,降低了阵列的输出功率平坦性.并且外腔端面反射率越大,这种平坦性降低的效果越明显.在构建分布反馈光纤激光器阵列时,应考虑外腔反馈对阵列输出功率平坦性造成的影响,尽量选择外腔端面反射率较小的激光器进行组阵. 相似文献
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A new approach for the simultaneous coherent and spectral addition of a two-dimensional array of fiber lasers is presented. A combining efficiency of over 80% and a combined beam profile with M(2)=1.15 were experimentally obtained with an array of four fiber lasers. This approach can lead to significant upscaling in fiber laser additions. 相似文献
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Zhengchun Xu Yueguang Jiao Shien-Kuei Liaw Fu-Chun Hung TAO Qin Hanyi Zhang Yili Guo Xiaoping Zheng 《光学学报》2003,23(Z1)
Two array waveguide grating (AWGs) based fiber ring lasers are experimentally demonstrated. Either of them achieves wavelength discrete tuning of 32 nm, or yields simultaneously lasing up to four channels with -7 dBm output power for each channel. 相似文献
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We experimentally demonstrate the phase locking of a two-dimensional (2D) array of four fiber lasers using an improved self-imaging resonator with a spatial filter. The high visibility interference round stripes of the coherent beam profile are observed. The coherent output power of the fiber array exceeds 134 W. Tile entire system operates quite stably, and no thermal effects observe in the spatial filter, indicating that the coherent output power can be increased using this method. 相似文献