分类： 光学 >> 量子光学 提交时间： 2023-02-19
摘要： Achieving high-precision light manipulation is crucial for delivering information through complex media with high fidelity. However, existing spatial light modulation devices face a fundamental tradeoff between speed and accuracy, limiting their use in various real-time and quality-demanding applications. To address this challenge, we propose a physics-based sparsity-constrained optimization framework for enhancing projection quality through complex media at a full DMD frame rate of 22 kHz. By addressing the limited degrees of freedom, scattering effect, and ill-posed and ill-conditioned nature of the inverse problem, our method achieves solutions with higher feasibility, optimality, and better numerical stability simultaneously. In addition, our method is system-agnositc and generalizable, showing consistent performance across different types of complex media. These results demonstrate the potential of our method in paving the way for high-fidelity and high-speed wavefront shaping in complex media, enabling a wide range of applications, such as non-invasive deep brain imaging, high-speed holographic optogenetics, and miniaturized fiber-based 3D printing devices.
分类： 光学 >> 量子光学 提交时间： 2023-02-19
Yuhao Jing
Yucong Yang
Wei Yan
Songgang Cai
Jiejun Su
Weihan Long
Nuo Chen
Yu Yu
Lei Bi
Yuntian Chen
摘要： Beam combination with high efficiency is desirable to overcome the power limit of single electromagnetic sources, enabling long-distance optical communication and high-power laser. The efficiency of coherent beam combination is severely limited by the phase correlation between different input light beams. Here, we theoretically proposed and experimentally demonstrated a new mechanism for beam combining, the topology-enabled beam combination (TEBC), from multiple spatial channels with high efficiency based on a unidirectional topological edge state. We show that the topologically protected power orthogonal excitation arising from both the unidirectional edge states and the energy conservation ensures -0.31dB (93%) efficiency experimentally for a multi-channel combination of coherent microwaves at 9.1-9.3 GHz. Moreover, we demonstrate broadband, phase insensitive, and high-efficiency beam combination using the TEBC mechanism with one single topological photonic crystal device, which significantly reduces the device footprint and design complexity. Our scheme transcends the limits of the required phase correlations in the scenario of coherent beam combination and the number of combined channels in the scenario of incoherent beam combination.
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