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| 2. |
- Harvey, Clarissa M., 1988-, et al.
(författare)
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Specialty optical fiber fabrication : fiber draw tower based on a CO laser furnace
- 2021
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Ingår i: Journal of the Optical Society of America. B, Optical physics. - : The Optical Society. - 0740-3224 .- 1520-8540. ; 38:12, s. F122-F129
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Tidskriftsartikel (refereegranskat)abstract
- An experimental, laboratory-scale optical fiber drawing tower based on CO laser heating has been developed and used to fabricate speciality optical fiber. The CO laser was utilized in a symmetric four beam heating system. The localized and responsive heating time of the laser-based furnace was beneficial for manufacturing crystalline core fibers, specifically, silicon core optical fibers. Moreover, the specific absorption properties of the CO laser radiation in silica have been evaluated with the aid of finite element modeling. In comparison to the more traditional CO2 laser, CO lasers were found to improve temperature uniformity and heating times while minimizing surface evaporation.
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| 3. |
- Harvey, Clarissa, 1988-, et al.
(författare)
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Mach-Zehnder Interferometer for In-Situ Non-Contact Temperature Monitoring During Thermal Processing of an Optical Fibre
- 2021
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Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 39:22, s. 7223-7230
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Tidskriftsartikel (refereegranskat)abstract
- A Mach-Zehnder interferometer is formed in the transverse plane of an optical fibre. This is exploited to monitor the temperature of any given optical fibre in real time, without any predesigned temperature sensing elements engineered into the fibre and without a need to access the fibre ends. The interferometer is formed by the refraction at the air-glass interface and the subsequent internal reflections within the fibre. The temperature response of the fibre is then measured by quadrature phase shift detection of the interference pattern. For context, this is compared to finite element modelling and a previously studied Fabry-Perot interferometer configuration. The temperature of an optical fibre was measured from room temperature up to 1174 degrees C with an error of +/- 2.6% for the Mach-Zehnder type interferometer. The measurement techniques presented offer a useful tool for precise temperature measurement for applications such as fibre post-processing.
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| 4. |
- Harvey, Clarissa, 1988-, et al.
(författare)
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Non-contact interferometric technique for fabrication of silica microspheres with improved ellipticity
- 2020
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Ingår i: Optics InfoBase Conference Papers. - : The Optical Society.
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Konferensbidrag (refereegranskat)abstract
- Monitoring the back-scattered light from a microsphere, acting as a low-Q concentric cavity interferometer, enables non-contact, in-situ measurement of diameter variations. The interferometric technique is used for improving ellipticity during microsphere fabrication and characterization.
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| 5. |
- Harvey, Clarissa, 1988-, et al.
(författare)
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Optimising draw parameters for the fabrication of low loss silicon-core optical fibre
- 2022
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Ingår i: Micro-Structured And Specialty Optical Fibres VII. - : SPIE-Intl Soc Optical Eng.
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Konferensbidrag (refereegranskat)abstract
- Optical fibre consisting of a pure silicon core in silica cladding combines the advantageous properties of silicon waveguides with the convenience of optical fibre. However, the optical quality of these fibres is highly dependent on the crystalline structure and the purity of the silicon. The fabrication of these fibres requires engineering of the thermal gradients during the drawing process to ensure optimal crystallisation of the silicon. Here, we investigated the effects of draw speed and analyse the induced stresses at multiple stages in the fabrication process. The thermal exposure of the silicon while in contact with a silica cladding was found to increase the optical losses. This was attributed to the diffusion of impurities from the silica cladding into the silicon core.
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| 6. |
- Maniewski, Pawel, et al.
(författare)
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Laser fabricated optical fibers with 3D printed cores
- 2022
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Ingår i: 2022 Conference on Lasers and Electro-Optics, CLEO 2022. - : Institute of Electrical and Electronics Engineers Inc..
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Konferensbidrag (refereegranskat)abstract
- We utilized a powder-based, 3D printing technique for prototyping optical fibers. Co-doped silica rods were printed using sub-micron powders with various compositions. The rods were sleeved and drawn into fibers. Ti/Al/Er-co-doped fibers are demonstrated.
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| 7. |
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| 8. |
- Maniewski, Pawel, et al.
(författare)
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Rapid prototyping of silica optical fibers
- 2022
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Ingår i: Optical Materials Express. - : Optica Publishing Group. - 2159-3930. ; 12:7, s. 2426-2435
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate a method for rapid prototyping of optical fibers. Silica-based glass rods were 3D printed using laser powder deposition. Different doping of the 3D printed rods is evaluated, including alumina, titania, and erbium-doped glass. The rods were subsequently used as the core material in preforms with optical fibers drawn using a laser-based draw tower. A transmission loss of 3.2 dB/m was found for a fiber with 1 wt% titania doped core and pure silica cladding. Using this fabrication method, prototyping from powder to optical fiber could be achieved within a few hours.
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| 9. |
- Mühlberger, Korbinian, et al.
(författare)
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High-performance arduino-based interferometric quadrature phase-shift detection system with 1 nm resolution
- 2021
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Ingår i: AIP Advances. - : AIP Publishing. - 2158-3226. ; 11:10, s. 105304-
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Tidskriftsartikel (refereegranskat)abstract
- A quadrature phase-shift detection system for interferometry has been conceptualized and evaluated. The main components, a microcontroller and two photodetectors, make a versatile low-cost detection system for displacement measurements or more generally phase-change measurements. The system is capable of sampling at 5 kHz with a spatial resolution of 1 nm.& nbsp;
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| 10. |
- Mühlberger, Korbinian, et al.
(författare)
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In-situ non-contact high-temperature measurement of an optical fiber up to the glass softening point
- 2021
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Ingår i: Optics Express. - : OPTICAL SOC AMER. - 1094-4087. ; 29:5, s. 7825-7832
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Tidskriftsartikel (refereegranskat)abstract
- The optical fiber itself can function as a partially reflecting concentric cavity interferometer when transversely probed by a focused laser beam. In this study, the thermal response of the fiber heated by a CO2-laser beam was characterized by monitoring the back-scattered interference pattern. Simultaneous measurement of the Bragg wavelength shift of an inscribed, high-temperature stable fiber Bragg grating allowed for calibration of the temperature-dependent phase response of the interferometer. The presented technique allows for in-situ non-contact temperature measurements up to the glass softening point.
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