Active optical fibres for application in laser and broadband ASE sources

Abstract

Abstract. The article brings into focus the present state of technology employing active fibres doped with rare earth (RE) ions for applications requiring power supply of several dozen watts and broadband ASE sources. Current trends in development of glasses and in construction of active fibres used in fibre sources of radiation within VIS-NIR range are presented. Technological constraints in the doping of fibre core glasses are discussed, with particular consideration of optimal RE concentration for technical applications. Characteristics of glasses are offered, and the glasses are used for manufacturing optical fibres with luminescence within the visible as well as near-and mid-infrared ranges. Also, requirements and luminescence properties concerning glasses co-doped with e.g. Nd 3+ /Yb 3+ ,Tm 3+ /Ho 3+ and Yb 3+ /Tb 3+ are discussed. Results of research on the impact of technological parameters of glass matrices on luminescence properties of core glasses and optical fibres are quoted. For the doped glasses of which luminescence in a wide spectral range is desired, conditions for their processing into optical fibre systems are mentioned. Additionally, the impact of phonon energy in the glass on producing emission in a specified spectral range is analyzed. Furthermore, the article presents directions of technological studies to solve problems persisting in the phase of glass matrix design, as well as in determining the influence of fibre drawing process on the luminescence properties of core glasses and optical fibres, confirming the differences in luminescence stemming from the drawing process. Finally, some original designs of core glasses and active multicore fibre systems devised for construction of fibre radiation sources are presented.

Producibility of the ion-exchange method in manufacturing gradient refractive index in glass

“…In addition to the passive elements of planar optics, the laser structures and optical amplifiers can also be produced by the ion exchange method. The glasses used for this purpose are doped with the rare-earth ions [54][55][56][57][58][59][60]. On the basis of gradient planar waveguide structures the optical sensors are also produced [61][62][63][64][65].…”

Reduction of silicon photomultipliers thermal generation in self-coincidence system applied in low level light measurements

“…Maximum of absorption spectrum for the WLS is equal to 430 nm. For emission this spectrum is shifted towards 480 nm [16,17]. Figure 4 shows an optical block set up.…”

Energy conversion in 7-(Diethylamino)coumarin doped PMMA fluorescent fibre

“…The step/gradient index and microstructured optical fibers can be fabricated using PMMA host (Miluski et al 2016b;Tama et al 2010;Bundalo et al 2014;Kailasnatha et al 2008;Oliveira et al 2015;Huang et al 2004;Barton et al 2004). Moreover, the guiding properties of optical fibres can be used to obtain some specific advantages: optical signal amplification, amplified spontaneous emission (ASE), and energy transfer (Karimi et al 2004;Dorosz et al 2012;Arrue et al 2011;Ayesta et al 2011;Nihei et al 1996). The optical amplifiers, sensors, and lasers based on fluorescent organic complexes were reported so far (Dorosz et al 2012;Arrue et al 2011;Ayesta et al 2011;Nihei et al 1996).…”

“…Moreover, the guiding properties of optical fibres can be used to obtain some specific advantages: optical signal amplification, amplified spontaneous emission (ASE), and energy transfer (Karimi et al 2004;Dorosz et al 2012;Arrue et al 2011;Ayesta et al 2011;Nihei et al 1996). The optical amplifiers, sensors, and lasers based on fluorescent organic complexes were reported so far (Dorosz et al 2012;Arrue et al 2011;Ayesta et al 2011;Nihei et al 1996). The Stoke shift, mirror symmetry of absorption and emission spectra, high quantum yield and short lifetime (few ns) were reported in PMMA host doped by coumarins (Johansson 1991;Al-Hamdani et al 2010;Kailasnatha et al 2008).…”