Abstract
Autocorrelation analysis for a velocity measurement based self-mixing speckle in an erbium-doped fiber ring (EDFR) laser is presented. The expression for the velocity measurement is deduced. Theoretical analysis reveals that the velocity of a random surface is inversely proportional to the autocorrelation time of the self-mixing signal produced in the EDFR laser. In experiments, a linear fit between the velocity and the reciprocal of autocorrelation time (autocorrelation frequency) is obtained for velocity measurement. In a range of velocities from 100 mm/s to 350 mm/s, the measurement errors are evaluated to be less than 5%. The signal length, the measurement distance, and the pump power are experimentally studied for gaining knowledge of the influence on the velocity measurement.
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Han, D., Chen, S. & Ma, L. Autocorrelation of self-mixing speckle in an EDFR laser and velocity measurement. Appl. Phys. B 103, 695–700 (2011). https://doi.org/10.1007/s00340-010-4346-6
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DOI: https://doi.org/10.1007/s00340-010-4346-6