Seminário de Óptica de terça-feira, 15 de maio: ESPECIAL
Seminário de Óptica em comemoração ao Dia Internacional da Luz
Resumo: Optical fibers have been used for sensing and measurement for decades. Recently, however, the use of fibers in industrial environments became much more accepted. Some of the driving forces behind this development include the concept that machines must also tell us how they are doing, the introduction of new classes of materials, and the need for increased efficiency in industrial processes, for example at high temperature or under the sea. All these open new opportunities for the use of fibers. Likewise, the needs for monitoring the environment, for safety and for human health are examples of challenges that require advanced sensing. The known advantages of optical fibers are then increasingly explored in monitoring temperature, pressure, movement, distance, acceleration, electric and magnetic fields and current and many other parameters. In this seminar, we will discuss possibilities opened by the use of advanced fibers and techniques for sensing and measurement, and give some examples of recent work in the area.
The presentation will discuss our recent progress in high quality SRS-DFB-FBG lasers for single mode, single frequency and polarisation operation at virtually any wavelength, with thresholds of only 100’s mW for semiconductor diode laser pumping, and the possibility of designing random-FBG Raman lasers with any desired randomness.