2:30pm - 2:45pmID: 141
/ TOM13 S05: 1
TOM 13 Advances and Applications of Optics and Photonics
Spectral scaling transformations of nonstationary light
Jyrki Laatikainen1, Matias Koivurova2, Jari Turunen1, Tero Setälä1, Ari T. Friberg1
1University of Eastern Finland, Finland; 2Tampere University, Finland
We present optical systems, which transform isodiffracting nonstationary beams into fields obeying either cross-spectral purity or spectral invariance. The designs are hybrid refractive-diffractive imaging systems, which are able to perform the desired transformations over a broad spectral bandwidth and irrespective of the state of spatial coherence of the input beam.
2:45pm - 3:00pmID: 206
/ TOM13 S05: 2
TOM 13 Advances and Applications of Optics and Photonics
Cross-spectral purity for nonstationary optical fields
Meilan Luo1,2, Jyrki Laatikainen1, Atri Halder1, Matias Koivurova3, Tero Setälä1, Jari Turunen1, Ari T. Friberg1
1University of Eastern Finland, Finland; 2Hunan Normal University, China; 3Tampere University, Finland
We derive an extended reduction formula for the time-integrated coherence function starting from the cross-spectral purity conditions for nonstationary optical fields. Two types of separable cross-spectral density functions that ensure cross-spectral purity are introduced and their implications are discussed.
3:00pm - 3:15pmID: 137
/ TOM13 S05: 3
TOM 13 Advances and Applications of Optics and Photonics
Elliptical cladding elements in negative curvature hollow-core fiber for low-loss terahertz guidance
Asfandyar Khan, Mustafa Ordu
UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Turkey
Optical losses of ellipse-nested elliptical negative curvature hollow-core fibers are numerically presented for the terahertz region. Primary design parameters of all fibers were iteratively optimized and confinement and total losses as low as 2.79×10-5 dB/m and 0.015 dB/m were achieved at 0.55 THz, respectively. Single-mode light guidance of the proposed design was investigated and a higher-order mode extinction ratio of around 3000 was calculated.
3:15pm - 3:30pmID: 177
/ TOM13 S05: 4
TOM 13 Advances and Applications of Optics and Photonics
3D printed hollow-core polymer optical fiber with six-pointed star cladding for the light guidance in near-IR regime
Mahmudur Rahman1, Ceren Dilsiz1,2, Mustafa Ordu1
1UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Turkey; 2Department of Electrical and Electronics Engineering, Ankara University, Gölbaşı, Ankara 06830, Turkey
Polymer optical fibers have great significance due to the wide range of applications, such as data transmission, sensing and illumination. In this study, we proposed a novel hollow-core polymer optical fiber fabricated by a commercially available 3D printer with guiding properties in the near-infrared region. The fiber was drawn conventionally using thermal drawing tower from a 3D printed preform. Light is guided through the air core surrounded by six-pointed star cladding tubes. Measured transmission losses of as low as 0.33 dB/cm was achieved in the near-infrared region.
3:30pm - 3:45pmID: 182
/ TOM13 S05: 5
TOM 13 Advances and Applications of Optics and Photonics
Hybrid cladding designs in chalcogenide negative curvature hollow-core fibers
Asfandyar Khan, Mustafa Ordu
UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Cankaya, Ankara 06800, Turkey
Ellipse-nested tubular As2Se3 chalcogenide negative curvature hollow-core fibers are numerically presented for the mid-infrared region. Confinement and total losses are calculated as low as 0.38 dB/km and 4.66 dB/km at 10.6 µm, respectively. A further investigation on the fundamental and higher order modes showed that the proposed fiber favors the single-mode guidance.
3:45pm - 4:00pmID: 219
/ TOM13 S05: 6
TOM 13 Advances and Applications of Optics and Photonics
A φ-Shaped Bending-Optical Fiber Sensor for the Measurement of Radial variation in Cylindrical Structures
Victor Henrique Rodrigues Cardoso1,4, Paulo Caldas4,5, M. Thereza R. Giraldi2, Orlando Frazão3,4, João Weyl Costa1, José L. Santos3,4
1Federal University of Pará, Applied Electromagnetism Laboratory, Rua Augusto Corrêa, 01, 66075-110, Belém, Pará, Brazil; 2Military Institute of Engineering, Laboratory of Photonics, Praça Gen. Tibúrcio, 80,22290-270, Rio de Janeiro, Brazil; 3Department of Physics and Astronomy, Faculty of Sciences of University of Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal; 4nstitute for Systems and Computer Engineering, Technology and Science, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal; 5Polytechnic Institute of Viana do Castelo, Rua Escola Industrial e Comercial de Nun’Álvares, 4900-347, Viana do Castelo, Portugal
This work presents preliminary results of the $\phi$ -shaped sensor mounted on support designed by additive manufacturing (AM). This sensor is proposed and experimentally demonstrated to measure the radial variation of cylindrical structures. The sensor presents an easy fabrication. The support was developed to work using the principle of leverage. The sensing head is curled between two points so that the dimension associated with the macro bend is changed when there is a radial variation. The results indicate that the proposed sensor structure can monitor radial variation in applications such as pipelines and trees.
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