Researching | Efficient Encoding Method for Computer-Generated Hologram

Laser & Optoelectronics Progress, Volume. 61, Issue 8, 0809002(2024)

Efficient Encoding Method for Computer-Generated Hologram

chunqi Li^1,2,3,4, Qitai Huang^1,2,3,4、*, and Jianfeng Ren^1,2,3,4

Author Affiliations

¹School of Optoelectronic Science and Engineering, Soochow University, Suzhou 215006, Jiangsu , China

²Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, Jiangsu , China

³Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province, Soochow University, Suzhou 215006, Jiangsu , China

⁴Key Laboratory of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, Jiangsu , China

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Figures&Tables (10)

References (11)

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Figures & Tables(10)

Fig. 1. Schematic of fringe classification

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Fig. 2. Arc description. (a) Original curve and sampling points; (b) schematic of multi-segment arc depicting discrete points

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Fig. 3. Decision flow chart of the optimal solution of the coordinate interval

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Fig. 4. Schematic of encoding errors

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Fig. 5. Systematic model for CGH detection of off-axis aspheric surface

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Fig. 6. Design and simulation. (a) Phase distribution; (b) system wavefront

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Fig. 7. CGH. (a) Physical picture; (b) fringe pattern

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Table 1. Different types of fringes corresponding to the judgment conditions and index range
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Table 1. Different types of fringes corresponding to the judgment conditions and index range
Fringe type Judgment condition Index range
Closed curve $x_{s t a r t} = x_{e n d}$ $x_{s t a r t} \to x_{m i n} \to x_{m a x} \to x_{e n d}$
Clothoid curve $x_{s t a r t} \neq x_{e n d}$ $x_{s t a r t} \neq x_{m i n}$
Normal curve $x_{s t a r t} = x_{m i n}$ $x_{s t a r t} \to x_{e n d}$

Table 2. Aspheric parameters and system paremeters
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Table 2. Aspheric parameters and system paremeters
Aspheric parameter R /mm D /mm K Off-axis distance /mm Material
700 100 -1 150 Zerodur
System paremeter $d {}_{1}$ /mm $d_{2}$ /mm Null pattern in diameter /mm Substrate material Thickness of CGH /mm
460 271.5 40 Fused silica 1.5

Table 3. Wavefront errors

Table 3. Wavefront errors

Source of error		Wavefront error（RMS）
Design residual error		0.00020λ
Encoding error		0.00085λ
Etching error	Pattern distortion error	0.00180λ
	Duty-cycle error	0
	Etching depth error	0.00156λ
	Amplitude ratio error	0.00023λ
Sum of error （RSS）		0.00255λ

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chunqi Li, Qitai Huang, Jianfeng Ren. Efficient Encoding Method for Computer-Generated Hologram[J]. Laser & Optoelectronics Progress, 2024, 61(8): 0809002

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Paper Information

Category: Holography

Received: Mar. 7, 2023

Accepted: Apr. 12, 2023

Published Online: Apr. 16, 2024

The Author Email: Huang Qitai (huangqitai@suda.edu.cn)

DOI:10.3788/LOP230788

Topics

laser devices and laser physics

Lasers and Laser Optics

laser manufacturing

Instrumentation, Measurement and Metrology