Improved fabrication techniques of extruded simplified hollow core optical fibers for Raman spectroscopy (Conference Presentation)

Erik P. Schartner; Georgios Tsiminis; Mustaf Bekteshi; Heike Ebendorff-Heidepriem

doi:10.1117/12.2286813

14 March 2018 Improved fabrication techniques of extruded simplified hollow core optical fibers for Raman spectroscopy (Conference Presentation)

Erik P. Schartner, Georgios Tsiminis, Mustaf Bekteshi, Heike Ebendorff-Heidepriem

Author Affiliations +

Proceedings Volume 10488, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVIII; 104880Z (2018) https://doi.org/10.1117/12.2286813
Event: SPIE BiOS, 2018, San Francisco, California, United States

Abstract

Hollow core fibers (HCFs) have found extensive use for biological sensing applications, with areas such as Raman spectroscopy being of key interest for deployment of these fibers due to their low Raman background and broad transmission spectral windows. However, fabrication of these fibers is currently based on capillary stacking of hollow tubes, a complex, time-consuming and therefore costly process that limits their potential for use in practical devices. Glass billet extrusion, an alternative to the capillary stacking process, presents a potential pathway to reducing the high fabrication cost of HCFs. Extrusion is a process in which a glass billet is heated to its softening point and is then forced through a metallic die containing the inverse of the desired structure. This is a one-step, automated process that requires no manual stacking to obtain the desired glass preform. Initial work using extrusion for HCF fabrication has resulted in fibers with large variations in the uniformity of the core walls, leading to increases in the optical loss of these fibers over the theoretical predictions. Here we present work on improvements to the extrusion process of these fibers, aiming to both reduce the loss of the fibers. Several iterations of the die exit geometry are shown to affect the geometry and uniformity of the preform structure, which translates into changes in the final fiber geometry and therefore the transmission properties of the HCFs. The fabrication methods used here show strong potential for improved guidance properties in future generations of HCFs.

Conference Presentation

Citation Download Citation

Erik P. Schartner, Georgios Tsiminis, Mustaf Bekteshi, and Heike Ebendorff-Heidepriem "Improved fabrication techniques of extruded simplified hollow core optical fibers for Raman spectroscopy (Conference Presentation)", Proc. SPIE 10488, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVIII, 104880Z (14 March 2018); https://doi.org/10.1117/12.2286813

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KEYWORDS

Raman spectroscopy

Glasses

Capillaries

Biosensing

Fabrication

Manufacturing

Optical fibers

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