Fiber Array Energy Transmission System Based on Dammann Grating Coupling

Fig. 5. Optical power density distribution of different period numbers Dammann grating with fundamental mode Gaussian beam. (a) 8 periods; (b) 14 periods

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Fig. 6. Optical power density distribution of 14 periods Dammann grating when incident beam waist radius is 0.5 mm

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Fig. 7. Experiment system

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Fig. 8. Light spot radius measurement

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Fig. 9. Spot size before and after beam splitting

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Fig. 10. Diagram of system parameters design

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Table 1. Phase jump points coordinate in unit period of Dammann grating
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Table 1. Phase jump points coordinate in unit period of Dammann grating
l a_l b_l
1 0 0.1144
2 0.2088 0.5000
3 0.6144 0.7088

Table 2. Diffraction efficiency of Dammann grating
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Table 2. Diffraction efficiency of Dammann grating
Diffraction level Diffraction efficiency
$\pm 1$ 0.1412
$\pm 3$ 0.1404
$\pm 5$ 0.1409

Table 3. Simulation parameters
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Table 3. Simulation parameters
Parameter $λ$ /μm $w_{0}''$ /mm $d$ /mm $n$ $F$ /mm
Value 0.532 1 1 8 120

Table 4. Spot size before and after beam splitting
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Table 4. Spot size before and after beam splitting
No. $d_{fo}$ /μm $d_{sp}$ /μm $Δ$ /%
1 60 57 -5.0
2 80 80 0.0
3 106 116 9.4
4 233 236 1.3
5 326 303 -7.1

Table 5. Sub-spots spacing
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Table 5. Sub-spots spacing
No. $s$ /mm $z$ /mm $s_{ca}$ /mm $Δ$ /%
1 1.72 53 1.70 -1.2
2 1.98 63 2.02 2.0
3 2.18 67 2.14 -1.8
4 2.66 75 2.40 -9.8
5 2.90 88 2.82 -2.6

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She Riyin, Li Dehong, Chen Dongwen, Li Yong. Fiber Array Energy Transmission System Based on Dammann Grating Coupling[J]. Laser & Optoelectronics Progress, 2021, 58(1): 105001

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