Measurement of refractive index change of optical fiber core induced by femtosecond laser scanning

Han, Yukun; Wei, Tao; Tsai, Hai-Lung; Xiao, Hai

doi:10.1117/1.3449113

Cited by 5 publications

(1 citation statement)

References 19 publications

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“…The plane-based Plücker matrices A * , B * are further transformed to the dual matrices A , B by the Graßmann–Plücker relation 32 . A laser plane can be determined by two laser lines A , B 34 . Thus, the laser plane satisfieswhere φ is the laser plane of the binocular-active-vision system.…”

Section: Methodsmentioning

confidence: 99%

Profile measurement adopting binocular active vision with normalization object of vector orthogonality

Chen

et al. 2019

Sci Rep

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Active-vision-based measurement plays an important role in the profile inspection study. The binocular vision, a passive vision, is employed in the active vision system to contribute the benefits of them. The laser plane is calibrated by two 2D targets without texture initially. Then, an L target with feature points is designed to construct the orthogonality object of two vectors. In order to accurately model the binocular-active-vision system, the feature points on the L target are built by two cameras and parameterized by the laser plane. Different from the optimization methods on the basis of the distance object, the laser plane is further refined by the distance-angle object. Thus, an optimization function is created considering both the norms and angles of the vectors. However, the scale of the distance is diverse from the scale of the angle. Therefore, the optimization function is enhanced by the normalization process to balance the different scales. The comparison experiments show that the binocular active vision with the normalization object of vector orthogonality achieves the decreasing distance errors of 25%, 22%, 13% and 4%, as well as the decreasing angle errors of 23%, 20%, 14% and 4%, which indicates an accurate measurement to reconstruct the object profile.

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Section: Methodsmentioning

confidence: 99%

Profile measurement adopting binocular active vision with normalization object of vector orthogonality

Chen

et al. 2019

Sci Rep

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Direct inscription of intrinsic Fabry-Perot interferometers in optical fiber tapers with a femtosecond laser

Zhang

Wang

et al. 2011

SPIE Proceedings

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In this work, we report a sensing configuration of the fiber taper intrinsic Fabry-Perot interferometer directly inscribed in single-mode optical fiber tapers with different waist diameters from 14 to 80 µm using a femtosecond laser micromachining system. By controlling the inscribing depth and intensity of the fs laser pulse, the fringe visibility can exceed 9.0 dB when the fiber taper waist diameter is around 15 µm, which is sufficient for most sensing applications. The sensor sensitivity depends on the fiber taper waist diameter, while a smaller diameter corresponds to a large sensitivity. Different free spectral ranges can be achieved for various cavity lengths. Such a structure can combine the high sensitivity properties of fiber taper sensors with the high resolution features of Fabry-Perot interferometer sensors. Meanwhile, this structure can have a number of outstanding advantages, such as its small size, unique geometry, easy fabrication, low cost and capability for mass production. These fiber taper intrinsic Fabry-Perot interferometer sensors have high potential in fast detection and high precision measurement while maintaining superior reliability for chemical and biological sensing.

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Direct inscription of intrinsic Fabry-Perot interferometers in optical fiber tapers with a femtosecond laser

Li¹,

Zhang²,

Wang³

et al. 2011

Passive Components and Fiber-Based Devices

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Measurement of refractive index change of optical fiber core induced by femtosecond laser scanning

Cited by 5 publications

References 19 publications

Profile measurement adopting binocular active vision with normalization object of vector orthogonality

Profile measurement adopting binocular active vision with normalization object of vector orthogonality

Direct inscription of intrinsic Fabry-Perot interferometers in optical fiber tapers with a femtosecond laser

Direct inscription of intrinsic Fabry-Perot interferometers in optical fiber tapers with a femtosecond laser

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