Research Article: Open Access Optcs and Photonic Engineering Internatonal Journal of VIBGYOR ISSN: 2631-5092 Citaton: Gebrekidan MT, Knipfer C, Braeuer AS (2021) Raman Fiber Bundle Probe of Individually Filter-Coated Fibers. Int J Opt Photonic Eng 6:044 Accepted: December 18, 2021; Published: December 20, 2021 Copyright: © 2021 Gebrekidan MT, et al. This is an open-access artcle distributed under the terms of the Creatve Commons Atributon License, which permits unrestricted use, distributon, and reproducton in any medium, provided the original author and source are credited. *Corresponding author: Andreas Siegfried Braeuer, Insttute of Thermal-, Environmental- and Resources’ Process Engineering (ITUN), Technische Universität Bergakademie Freiberg (TUBAF), Freiberg, Germany Gebrekidan et al. Int J Opt Photonic Eng 2021, 6:044 Raman Fiber Bundle Probe of Individually Filter-Coated Fibers Medhanie Tesfay Gebrekidan 1 , Christian Knipfer 2 and Andreas Siegfried Braeuer 1* 1 Institute of Thermal-, Environmental- and Resources’ Process Engineering (ITUN), Technische Universität Bergakademie Freiberg (TUBAF), Freiberg, Germany 2 Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany Abstract We report how we had a Raman fber bundle probe with individually flter-coated fbers manufactured by organizing an iteratve producton process between one fber coatng and one fber bundling company. Short- and long pass flters had directly been deposited at the ends of the excitaton and detecton fbers, before the single fbers were confgured to a 6-around-1 fber bundle. We found that the performance of the fber bundle probe with individually flter-coated fbers, with respect to signal detecton and suppression of elastcally scatered light, is similar to a free-beam Raman reference probe. The demonstraton of a Raman fber bundle probe with individually flter-coated fbers paves the way for the development of fber bundle Raman probes suitable for several excitaton and detecton channels. Keywords Raman fber probe, Optcal fber bundle, Optcal flter coatng, Raman spectroscopy In practce, usually the Stokes-part of the Raman spectrum is analyzed. In order to being able to extract as much informaton as possible from the Raman-Stokes spectrum of a sample, it is advantageous to analyze its entre spectral range between the smallest and the largest potentally occurring Raman shifs. The smallest Raman shif of 0 cm -1 is due to elastc light scatering and therefore corresponds to the wavelength of the excitaton laser. The largest potentally occurring Raman shif of approximately 4155 cm -1 corresponds to the intra-molecular vibraton of the hydrogen molecule. The largest Raman shifs of other species Introducton The Raman spectrum of a sample originates from an inelastc light/mater-interacton, which is referred to as Raman scatering. The Raman spectrum contains valuable informaton about the sample, such as its chemical compositon [1-3], its temperature [4-6], its polymorphism [7-9], its heterogeneity and - with respect to medicine or biology - also the histopathological state of human, animalistc or herbal tssue [10-12]. Optcal fbers play a pivotal role for making Raman measurements possible deep inside the body, remotely or in hardly accessible or hazardous environments [13,14]. DOI: 10.35840/2631-5092/4544