Laser Diode Beam Shaping Method Based on Complex Amplitude Modulation

Fig. 4. Experimental setup of large distance interferometric system. (a) Laser source and interferometric system in the near end; (b) interferometric system in the far end

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Fig. 5. Experimental results of displacement measurement at 8 m. (a) Step measurement results with the step of 1 μm; (b) repeated measurement results with the step of 10 μm

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Table 1. Beam parameters of the laser diode after initial beam shaping by the hologram
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Table 1. Beam parameters of the laser diode after initial beam shaping by the hologram
Direction M² ω₀ /mm z₀ /mm Δz /mm
x 1.034 1.246 3891.260
y 1.043 0.941 5585.992 1694.662

Table 2. Beam parameters of the laser diode after beam shaping by the hologram
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Table 2. Beam parameters of the laser diode after beam shaping by the hologram
Direction M² ω₀ /mm z₀ /mm Δz /mm
x 1.016 1.399 358.029
y 1.063 1.308 357.125 0.903

Table 3. Statistical results of displacement measurement data at 8 m
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Table 3. Statistical results of displacement measurement data at 8 m
Step of displacement measurement /μm Maximum error /nm Average error /nm Standard deviation /nm
1 -107.578 6.532 61.677
10 -108.560 5.781 64.485

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Benyong Chen, Zheyi Xu, Shihua Zhang, Ruipin Chen, Liping Yan. Laser Diode Beam Shaping Method Based on Complex Amplitude Modulation[J]. Chinese Journal of Lasers, 2018, 45(6): 0605005

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