Laser Phase Recovery Based on Propagation Properties of Gaussian Beam

Fig. 1. Phase shift of interferogram. (a) Pixel distribution of experimental interferogram; (b) pixel distribution ofthree frame phase shift interferograms

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Fig. 2. Analog interferogram and phase. (a) Interferogram; (b) phase

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Fig. 3. Recovery phase and error. (a) Recovery phase by FTM; (b) recovery error of FTM; (c) recovery phase by TFM; (d) recovery error of TFM

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$Schematic of optical fiber point diffraction interferometer$

Fig. 4. Schematic of optical fiber point diffraction interferometer

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Fig. 5. Measurement results. (a) Interference fringes; (b) theoretical distribution of measured phase; (c) recovery phase by FTM; (d) recovery phase by TFM

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Table 1. Detailed simulation results by using two methods
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Table 1. Detailed simulation results by using two methods
Item Real Method
FTM TFM
c₁ 22.728 23.000 22.7374
c₂ 16.482 16.000 16.4978
Phase PV /rad 3.1168 5.3089 3.1382
Phase RMS /rad 0.6279 1.0556 0.6293
Error PV /rad 3.9783 0.3158
Error RMS /rad 0.8550 0.0290

Table 2. Phase recovery error under different noise levels
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Table 2. Phase recovery error under different noise levels
Error Noise level /%
0 2 4 6 8 10
PV /rad 0.3158 0.4458 0.6658 0.7287 0.8297 0.9550
RMS /rad 0.0290 0.0292 0.0332 0.0406 0.0552 0.0682

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Peng Jinping, Feng Guoying, Lan Bin. Laser Phase Recovery Based on Propagation Properties of Gaussian Beam[J]. Chinese Journal of Lasers, 2018, 45(10): 1005001

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