Effects of Fiber Array Disturbance on Beam Quality in Compact Spectral Beam Combining System

Yongneng Wang; Fujian Li; Daxing Rao; Yong Cui; Xiaohui Zhao; Ruijing He; Lailin Ji; Yanqi Gao; Zhan Sui; Huacai Chen

doi:10.3788/CJL220826

Chinese Journal of Lasers, Volume. 50, Issue 7, 0701009(2023)

Effects of Fiber Array Disturbance on Beam Quality in Compact Spectral Beam Combining System

Yongneng Wang¹, Fujian Li², Daxing Rao², Yong Cui^2、*, Xiaohui Zhao², Ruijing He², Lailin Ji², Yanqi Gao², Zhan Sui², and Huacai Chen¹

Author Affiliations

¹Insititute of Optics and Electronics, China Jiliang University, Hangzhou 310018, Zhejiang, China

²Shanghai Institute of Laser Plasma, China Academy of Engineering Physics, Shanghai 201800, China

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Figures & Tables(12)

Fig. 1. Spectral beam combination systems. (a) Traditional spectral beam combination system; (b) compact spectral beam combining system

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Fig. 2. Schematics of light path of the nth subbeam in cases of different deviations. (a) Without deviation; (b) x-axis displacement deviation; (c) z-axis displacement deviation; (d) horizontal pointing deviation

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Fig. 3. Intensity distribution of beams at different planes (I₀ is the maximum intensity of central subbeam in the source plane). (a) Intensity distribution of each subbeam in source plane; (b) intensity distribution of combined laser at focal plane of lens

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Fig. 4. Beam quality factor curve of combined laser when only central fiber is in different deviations. (a) In x-axis displacement deviation; (b)in z-axis displacement deviation; (c) in horizontal pointing deviation

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Fig. 5. Beam quality factor curve of combined laser when entire optical fiber array is in different deviations. (a) In x-axis displacement deviation; (b) in z-axis displacement deviation; (c) in horizontal pointing deviation

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Fig. 6. Random horizontal pointing deviation in the nth subbeam

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Fig. 7. Statistical results of beam quality factor M² of combined laser when all fiber array in random deviations. (a) In x-axis deviation $σ_{x}$ ; (b) in z-axis deviation $σ_{z}$ ; (c) in horizontal pointing deviation $σ_{θ}$

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Fig. 8. Statistical results of beam quality factor M² of combined laser when all fiber array in random deviations. (a) Random x-axis displacement deviation $σ_{x}$ and z-axis displacement deviation $σ_{z}$ ; (b) random x-axis displacement deviation $σ_{x}$ and horizontal pointing deviation $σ_{θ}$ ; (c) z-axis displacement deviation $σ_{z}$ and horizontal pointing deviation $σ_{θ}$

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Fig. 9. Variation of statistical results of beam quality factor M² of combined laser with fiber array scale under standard deviations of different random deviations. (a) $σ_{x}$ =5 μm; (b) $σ_{z}$ =150 μm; (c) $σ_{θ}$ =10 mrad

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Table 1. Optical parameters of beam combining system
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Table 1. Optical parameters of beam combining system
Parameter Value Parameter Value
f /mm 200 $α_{0}$ /（°） 64.77
$d$ /mm 1/1740 $p_{0}$ /mm 6.70
$ω_{0}$ /μm 12.50 $Δ p$ /mm 0.40
$λ_{0}$ /nm 1055.00 m 1

Table 2. Beam quality factor M² of combined laser affected by central disturbance

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Table 2. Beam quality factor M² of combined laser affected by central disturbance

Beam deviation		M²
Displacement deviation in x direction $δ x$ /μm	-30	1.8969
Displacement deviation in x direction $δ x$ /μm	30	1.898
Displacement deviation in z direction $δ z$ /mm	-1	1.8053
Displacement deviation in z direction $δ z$ /mm	1	1.7471
Horizontal pointing deviation around coordinate origin $δ θ_{h}$ /mrad	-40	1.6105
	40	1.7962

Table 3. Beam quality factor M² of combined laser affected by disturbance of whole fiber array

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Table 3. Beam quality factor M² of combined laser affected by disturbance of whole fiber array

Beam deviation		M²
Displacement deviation in x direction $δ x$ /mm	-0.6	1.7588
Displacement deviation in x direction $δ x$ /mm	0.6	1.7749
Displacement deviation in z direction $δ z$ /mm	-5	1.5944
Displacement deviation in z direction $δ z$ /mm	5	1.6955
Horizontal pointing deviation around coordinate origin $δ θ_{h}$ /mrad	-60	1.8673
	60	1.8524

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Yongneng Wang, Fujian Li, Daxing Rao, Yong Cui, Xiaohui Zhao, Ruijing He, Lailin Ji, Yanqi Gao, Zhan Sui, Huacai Chen. Effects of Fiber Array Disturbance on Beam Quality in Compact Spectral Beam Combining System[J]. Chinese Journal of Lasers, 2023, 50(7): 0701009

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Paper Information

Category: laser devices and laser physics

Received: May. 7, 2022

Accepted: Jul. 4, 2022

Published Online: Mar. 6, 2023

The Author Email: Cui Yong (yong_cui@126.com)

DOI:10.3788/CJL220826

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Optical parameters of beam combining system

Table 1. Optical parameters of beam combining system

Table 2. Beam quality factor M2 of combined laser affected by central disturbance

Table 2. Beam quality factor M2 of combined laser affected by central disturbance

Table 3. Beam quality factor M2 of combined laser affected by disturbance of whole fiber array

Table 3. Beam quality factor M2 of combined laser affected by disturbance of whole fiber array

Table 2. Beam quality factor M² of combined laser affected by central disturbance

Table 2. Beam quality factor M² of combined laser affected by central disturbance

Table 3. Beam quality factor M² of combined laser affected by disturbance of whole fiber array

Table 3. Beam quality factor M² of combined laser affected by disturbance of whole fiber array