Fast measurement of the laser beam quality factor based on phase retrieval with a liquid lens

Ji, Kunhao; Hou, Tao-Ran; Li, Junbo; Meng, Lingqiang; Han, Zheng‐Fu; Zhu, Rihong

doi:10.1364/ao.58.002765

Cited by 5 publications

(5 citation statements)

References 31 publications

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“…Signal output power is sampled using optical wedges and camera and observed at different polarization using a polarizer. The camera-based M 2 measurement system represents the core of our setup to retrieve the intensity and phase of the output signal using an iterative phase retrieval method [6]. This is followed up by an off-line mode decomposition scheme based on the correlation with the fiber modes, which allow estimating the power and phase carried by the guided modes LP01, LP11e,o(fig.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Observation of Light Self-Organization and Mode Attraction in a Multimode Optical Fiber

Jain

Núñez-Velázquez

et al. 2022

Conference on Lasers and Electro-Optics

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Section: Experimental Setup and Resultsmentioning

confidence: 99%

Observation of Light Self-Organization and Mode Attraction in a Multimode Optical Fiber

Jain

Núñez-Velázquez

et al. 2022

Conference on Lasers and Electro-Optics

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“…However, despite the fact that the presented method is simple in its implementation, it is labor-intensive due to the need for multiple registrations of intensity distributions in the field under study. Therefore, a number of alternative methods have been developed for more efficient 𝑀 measurements, including methods based on wavefront sensors [12,13], liquid crystal lens [14], computer-generated holograms [15], spatial light modulators [16], and several others.…”

Section: Methods and Approachesmentioning

confidence: 99%

“…Therefore, a number of alternative methods have been developed for more efficient M 2 measurements, including methods based on wavefront sensors [12,13], liquid crystal lens [14], computer-generated holograms [15], spatial light modulators [16], and several others.…”

Section: Introductionmentioning

confidence: 99%

Reconstructing the Spatial Parameters of a Laser Beam Using the Transport-of-Intensity Equation

Kovalev

Gritsenko

Stsepuro

et al. 2022

Sensors

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A simple method for reconstructing the spatial parameters of a laser beam, based on the transport-of-intensity equation, is presented. Registration of cross-section intensity distributions in several planes was carried out using a single CMOS camera. The processing of the experimental measurements with the help of specialized software helped to reconstruct all of the spatial parameters, namely, the radius and position of the waist, Rayleigh length, angular divergence, quality parameter M2 The method was compared with measurements made according to the international standard ISO 11146 and showed that the difference in the spatial parameters is 10% or less, which shows good agreement.

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“…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. When the spot is small, a CCD camera is commonly used [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. The beam can act directly on the CCD array in the camera [ 8 , 9 ] or be imaged on various screens and shot by the camera [ 1 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…When the spot is small, a CCD camera is commonly used [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. The beam can act directly on the CCD array in the camera [ 8 , 9 ] or be imaged on various screens and shot by the camera [ 1 , 10 , 11 ]. Such methods have the advantage of high resolution [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

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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Fast measurement of the laser beam quality factor based on phase retrieval with a liquid lens

Cited by 5 publications

References 31 publications

Observation of Light Self-Organization and Mode Attraction in a Multimode Optical Fiber

Observation of Light Self-Organization and Mode Attraction in a Multimode Optical Fiber

Reconstructing the Spatial Parameters of a Laser Beam Using the Transport-of-Intensity Equation

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

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