1 中国科学院空天信息创新研究院，北京 100094
2 北京邮电大学电子工程学院，北京 100876
3 中国科学院大学光电学院，北京 100049
4 齐鲁空天信息研究院，山东 济南 250101
5 中国地质大学（北京）数理学院，北京 100083
6 中国科学院计算光学成像技术重点实验室，北京 100094
激光相干合成技术是在遥感和通信等领域中能够同时提升激光功率和保持光束质量的有效技术。其中填充因子是影响激光相干合成和衡量相干合成阵列的重要因素。然而，它却不是完备的。因此，提出采用平面波前畸变量（PWD）作为评估激光相干合成性能的综合参数，该参数综合考虑了光束质量、阵列对准、元件制造误差以及其他因素。通过理论推导平面波前畸变量的表达式，分析该参数对系统合成效率的影响，进一步的仿真和实验测量结果表明，平面波前畸变量可以用于反映激光相干合成的综合效率高低，与桶中功率呈负相关。研究结果表明波阵面调制相干光束组合技术在多孔径激光阵列相干组合系统的实际应用中具有潜在的科学价值。
相干合成 填充因子 桶中功率 激光阵列 波前 激光与光电子学进展
2024, 61(7): 0706004
Author Affiliations
Abstract
1 Key Laboratory of Optical Fiber Sensing and Communication Networks, School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2 Information and Quantum Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
The dissipative Kerr soliton microcomb provides a promising laser source for wavelength-division multiplexing (WDM) communication systems thanks to its compatibility with chip integration. However, the soliton microcomb commonly suffers from a low-power level due to the intrinsically limited energy conversion efficiency from the continuous-wave pump laser to ultra-short solitary pulses. Here, we exploit laser injection locking to amplify and equalize dissipative Kerr soliton comb lines, superior gain factor larger than 30 dB, and optical-signal-to-noise-ratio (OSNR) as high as 60 dB obtained experimentally, providing a potential pathway to constitute a high-power chip-integrated WDM laser source for optical communications.
Kerr microcomb optical injection locking coherent optical communications Chinese Optics Letters
2021, 19(12): 121401
电子科技大学 光纤传感与通信教育部重点实验室，成都 611731
针对回音壁模式(WGM)光学微腔中模式高效激发的需求，基于有限元软件COMSOL对模式电场分布的计算结果，设计了一种对于WGM激发效率的仿真方法。该方法可以对微腔与锥形光纤在不同耦合条件下不同模式的谐振峰最大深度进行仿真计算，从而确定该模式得到高效激发的耦合条件。在此基础上对模式的激发效率控制和高阶方位角模式的激发进行了仿真分析，结果表明：选择尺寸匹配的锥形光纤，通过精细调整耦合距离，可以实现对所加工微棒腔的基模从欠耦合到过耦合的激发控制；通过耦合位置的调整，可以实现对其高阶方位角模式的高效激发。
回音壁模式 光学微腔 耦合效率 whispering gallery mode optical microcavity coupling efficiency
Author Affiliations
Abstract
Key Laboratory of Optical Fiber Sensing and Communication Networks, School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
We demonstrate a novel method to control the free spectral range (FSR) of silica micro-rod resonators precisely. This method is accomplished by iteratively applying laser annealing on the already-fabricated micro-rod resonators. Fine and repeatable increasing of resonator FSR is demonstrated, and the best resolution is smaller than 5 MHz, while the resonator quality-factor is only slightly affected by the iterative annealing procedure. Using the fabricated micro-rod resonators, single dissipative Kerr soliton microcombs are generated, and soliton repetition frequencies are tuned precisely by the iterative annealing process. The demonstrated method can be used for dual-comb spectroscopy and coherent optical communications.
microcavities nonlinear optics pulse propagation temporal solitons Chinese Optics Letters
2021, 19(7): 071903
电子科技大学信息与通信工程学院, 四川 成都 621000
利用二氧化碳激光器在熔融石英棒上加工出具有超高品质因子的微棒腔,并研究了微腔的曲率、耦合位置以及耦合位置处锥形光纤的半径对激发的模式数量、品质因子以及耦合效率的影响。通过优化加工和耦合过程中的参数,在保证超高品质因子的同时激发出少量模式,有效避免了模式重叠,从而在不同波长下产生了具有频谱光滑包络的孤子光频梳。
非线性光学 回音壁模式 光学微腔 孤子光频梳 光学学报
2020, 40(19): 1919001
