XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
102
T4: O–5
Investigation of the influence of modifiers content on structural
and optical properties of germanium glasses doped with RE ions
Renata Jadach
1
, Marcin Kochanowicz
2
, Jacek Żmojda
2
, Piotr Miluski
2
,
Maciej Sitarz
1
, and Dominik Dorosz
1
1
University of Science and Technology in Krakow, Faculty of Materials Science and Ceramics, al.
Mickiewicza 30, 30-059 Kraków, Poland, e-mail: rjadach@agh.edu.pl
2
Bialystok University of Technology, Faculty of Electrical Engineering, Wiejska, 45D, 15-351
Bialystok, Poland
Due to the photonics applications, rare-earth doped glasses (RED) emitting at the visible-
NIR are under constant interest by many research groups. In fact the choice of host material is
crucial because of further optical properties and fiber manufacturing. Among oxide glasses
germanate possess high solubility of RE ions, good thermal stability, high refractive index and
relatively low phonon energy [1]. Gallium modified glasses characterizes of chemical stability
against crystallization, good mechanical properties and relatively low phonon energy [2].
This research is focused on finding the correlation between structure of obtained glasses and
their luminescence properties. Exchange of one modifier to another in the glass structure cause
changes in the structure and optical properties in a dependent manner. Different type and
amount of modifier can change the environment of rare earth ion in the glass structure and
follow it luminescence properties.
The investigated glassy system GeO2-Ga2O3-BaO-M, where M-modifier of various molar
content was doped with rare earth ions. Following study of prepared glasses’ samples were
executed: X-ray Diffraction measurements (Panalytical Empyrean powder diffractometer using
Cu Kα (λKα = 1.54186 Å)), SEM/EDS (SEM-FEI Nova 200 NanoSEM), FTIR spectra (Bruker
Company Vertex 70v spectrometer and Horriba Yvon Jobin LabRAM HR micro-Raman
spectrometer), luminescence spectra (Acton Spectra Pro 2300i monochromator and laser diode).
Keywords: germanium-gallate glass, luminescence, structure, spectroscopy.
References
[1] W. Zhang, X. Liu, X. Fan, L. Hu, L. Zhang, Opt. Mater. 37 (2014) 793.
[2] W.A. Pisarski, L. Żur, M. Kowal, J. Pisarska, J. Alloy. Compd. 651 (2015) 565.
XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
103
T4: O–6
Distributed fluorescent optical fiber proximity sensor
Ramona Gălătuș
1
, Paul Faragó
1
, and Piotr Miluski
2
1
Bases of Electronics Department, Technical University of Cluj-Napoca, Str. Memorandumului nr.
28, Romania, e-mal: ramona@mail.utcluj.ro
2
Department of Power Engineering Photonics and Lighting Technology, Białystok Technical
University, Bialystok, Poland
A fluorescent optical fiber is a fiber which exhibits certain sensitivity to an incident
phenomenon, e.g. oxygen molecules, high energy particles, UV or blue light [1, 2]. Operation of
the fluorescent fiber depends on the doping material in the fiber core, which determines specific
fluorescent and optical characteristics. Fluorescent optical fibers exhibit a variety of interesting
applications reported in literature [3–8].
In this work we have employed a fluorescent fiber for the implementation of a proximity
sensor. Operation of the optical proximity sensor relies on the fact that the presence or absence
of a person in the vicinity of the sensor will influence the incident illumination, and will change
the fiber fluorescence response accordingly.
We have tested and determined some characteristics of a 1mm red fluorescent fiber available
from Industrial Fiber Optics [2, 8]. Different light sources were used to characterize the
fluorescent fiber: blue, white and red LEDs and a halogen lamp. Next, the fiber is fed to an IF-
91 photodiode [2] and the diode voltage drop VD was measured under various fiber illumination
conditions. In laboratory environment, the nominal diode voltage drop measures 140mV. Test
scenarios account for varying the distance d between the photodiode and the fiber illumination
point, and the height h of the light source referred to the fiber. Extensive measurements were
performed. The fiber emission intensity exhibits a decrease with the distance d. The closer is the
fiber illumination point to the photodiode, the larger will the photodiode voltage drop be. Blue
and white incident light had the greatest influence on fiber emission power, achieving a
photodiode voltage drop as large as 360mV. The photodiode voltage drop vs. incident light
power exhibits a logarithmic dependency. Increasing the incident light power over a certain
value won’t bring considerable improvement on fiber emission. Axial illumination of the
fluorescent fiber with the halogen lamp, which results in a diode voltage drop of 350 mV.
Based on the characterization results, the proposed setup for the implementation of the
optical proximity sensor assumes having the halogen lamp deployed for axial fiber illumination
and a blue LED for side illumination. Measurement results of the prototype validate the
proposed concept.
Keywords: optical fibers, red fluorescence, proximity distributed sensing
Acknowledgment
This paper was supported by UEFISCDI, project number PN III - 67PED/2017 for Romanian authors’
contributions and COST MP1401 for Poland author’s contribution.
References
[1] ***, Axial Versus Side Illumination of a Fluorescent Cladding Optical Fiber.
[2] http://i-fiberoptics.com
[3] H. Aouani, F. Deiss, J. Wenger, P. Ferrand, N. Sojic, H. Rigneault, Opt. Express (2009) 18912.
[4] H. Zheng, L. Hao, H. He, KESE '09. Pacific-Asia Conference on Knowledge Engineering and
Software Engineering (2009).
[5] P. Aiestaran, V. Dominguez, J. Arrue, J. Zubia, Opt. Mater. (2009) 1101.
[6] P. Miluski, D. Dorosz, M. Kochanowicz, J. Żmojda, Electron. Lett., doi: 10.1049/el.2016.1491.
[7] P. Miluski, M. Kochanowicz, J. Żmojda, D. Dorosz, Chinese Opt. Lett. 14 (2016) 121602.
[8] N. Cennamo, R. Galatus et al., IEEE SAS 2017, 13-15 March 2017, New Jersey, USA.
Dostları ilə paylaş: |