Accuracy Recognition of Orbital Angular Momentum of Dual-Mode Vortex Beams

Fig. 3. Phase plate, light intensity distribution, and phase distribution of the beam when the proportional coefficient n is 0.01, 0.1, 0.5, 0.9, and 0.99, respectively

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Fig. 4. Relationship between accuracy and loss function and number of iterations

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Fig. 5. Influence of image resolution on OAM recognition accuracy

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Fig. 6. Influence of training sample number on OAM recognition accuracy

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Fig. 7. Confusion matrix

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Fig. 8. Influence of proportional coefficient n on OAM recognition accuracy

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Table 1. Structure of ResNet CNN model

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Table 1. Structure of ResNet CNN model

Layer name	Output size	Structure
Conv1	112×112	7×7, 64, stride2
Con2_x	56×56	3×3, maxpool, stride2 $[\begin{array}{l} 1 \times 1 & 64 \\ 3 \times 3 & 64 \\ 1 \times 1 & 256 \end{array}]$ ×3
Con3_x	28×28	$[\begin{array}{l} 1 \times 1 & 128 \\ 3 \times 3 & 128 \\ 1 \times 1 & 512 \end{array}]$ ×4
Con4_x	14×14	$[\begin{array}{l} 1 \times 1 & 256 \\ 3 \times 3 & 256 \\ 1 \times 1 & 1024 \end{array}]$ ×6
Con5_x	7×7	$[\begin{array}{l} 1 \times 1 & 512 \\ 3 \times 3 & 512 \\ 1 \times 1 & 2048 \end{array}]$ ×3
FC	1×1	Average pool,10dfc,softmax
FLOPs	--	3.8×10⁹

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Yuer Ye, Junyi Li, Meng Cao, Yong Xia. Accuracy Recognition of Orbital Angular Momentum of Dual-Mode Vortex Beams[J]. Laser & Optoelectronics Progress, 2021, 58(18): 1811021

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Paper Information

Category: Imaging Systems

Received: Feb. 23, 2021

Accepted: Apr. 22, 2021

Published Online: Sep. 3, 2021

The Author Email: Yong Xia (yxia@phy.ecnu.edu.cn)

DOI:10.3788/LOP202158.1811021

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology