ransparent glass-ceramics are still on the top in the field of functional photonic materials used in optical fiber technology. Generally, the glass-ceramic (GC) material consists of glass and suspended in amorphous volume nanocrystals doped with lanthanide ions. The controlled degree of crystallization is carried out in the process of heating materials at a specified temperature and at the right time of the experiment. Due to this, the glass-ceramic optical waveguide structures thus get better emission parameters (high quantum efficiency) compared to analogous amorphous structures, while maintaining the high optical quality. Nowadays, the GC optical fibers technology is complicated and consist many steps, wherein each stage of the experiment the material is thermal treated (melting → bulk annealing → drawing fibers → heat-treatment). As a result, this process is very complex and controlling the size and density of nanocrystals is difficult.
In our work we focused on the possibility to develop glass-ceramic optical fibers by one-step fabrication process. This is an innovative approach to the issue of nucleation, as well as to the growth of nanocrystals during the cooling of the vitreous mass. In fact, the crystallization process control through selecting the rate of cooling from the supercooled liquid zone during optical fibre drawing has not yet been investigated systematically. The influence of selected crystallization mechanism (nucleation and growth rates) on luminescent properties of GC is a kind of alternative approach to the currently used multi-step methods. Our experiment opens new possibilities for obtaining transparent glass-ceramic optical fibers with a high-density of nanocrystals embedded in their structure.
In this paper, thermal and luminescent properties of antimony-germanate SGS glass and glass-ceramic doped with europium ions as structural probe and phosphorus oxide as nucleation agent have been investigated. The effect of the modified synthesis of glass and heat treatment process on thermal and luminescence properties was discussed in detail. The study of luminescence changes was carried out with 395nm laser excitation, in the temperature range of 50 to 500°C. Fabricated SGS glass and glass-ceramic doped with europium ions have interesting effects in the different relations between radiative transitions. Strong and partially linear changes in asymmetry ratio between electric-dipole transition (EDT) and magneticdipole transition (MDT) as a function of temperature were analyzed as potential ways to obtain the sensitive optical temperature sensor. According to the results we concluded that antimony-germanate glass can be used as active materials for glass-ceramic optical fiber and photonic sensor.
Conducting research, especially in technical field often binds with necessity of making device prototype or specialized tools. In such situations implementing solution using hardware microcontroller-based platform is best way to reach set goal. Choice of development platform and software environment decides about success of project or allows saving significant amount of time. In article have been tested 3 common development platforms based on different microcontrollers and two high-level programming languages, C/C++ and new solution based on Python. Chosen testing process is based on mathematical procedures used in control, analysis and automation. Results of research should allow to selection of optimal hardware platform as well programming language according to planned use and requested computing power.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.