Unwrapping the laser beam quality through nonlinear time series and fractal analyses: A surrogate approach

Raj, Vimal; Swapna, M. S.

doi:10.1016/j.optlastec.2021.107029

Cited by 2 publications

(2 citation statements)

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“…Typical laser parameters, such as beam width, β factor, and M 2 factor, can be obtained by measuring the intensity distribution of one or more axial cross-section spots [ 1 , 2 , 3 ]. When the spot is large, the measurement system prioritizes the array target composed of attenuation and detection units [ 4 , 5 , 6 , 7 ]. The system always has a large aperture, and the calibration of the whole target can conveniently correct the inconsistent responsivity of sampling units.…”

Section: Introductionmentioning

confidence: 99%

“…However, its resolution is often limited by the complex unit design. Moreover, the transmittance and response of the units are sensitive to the incident angle in many applications [ 5 , 6 , 7 ], which is regarded as a significant error source. Since there are frequently variable and unmeasurable skew angles between the beam and the receiving system caused by alignment error, the measurement is expected to be only related to the incident energy, not the incident angle.…”

Section: Introductionmentioning

confidence: 99%

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Study on Laser Parameter Measurement System Based on Cone-Arranged Fibers and CCD Camera

Luo

Qin

Hou

et al. 2022

Sensors

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This paper proposes a new laser parameter measuring method based on cone-arranged fibers to further improve the measurable spot size, allowable incident angle range, and spatial sampling resolution. This method takes a conical array composed of flexible fibers to sample and shrink the cross-section spot of the laser beam, facilitating low-distortion shooting with a charge-coupled diode (CCD) camera, and adopts homogenized processing and algorithm analysis to correct the spot. This method is experimentally proven to achieve high-accuracy measurements with a decimeter-level spot-receiving surface, millimeter-level resolution, and high tolerance in order to incite skew angle. Comparing the measured spot under normal incidence with the real one, the root mean square error (RMSE) of their power in the bucket (PIB) curves is less than 1%. When the incident angle change is between −8° and 8°, the RMSE is less than 2% and the measurement error of total power is less than 5% based on the premise that the fiber’s numerical aperture (NA) is 0.22. The possibility of further optimizing the measurement method by changing the fiber parameters and array design is also reported.

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