Multiple visible emissions by means of up-conversion process in a microstructured tellurite glass optical fiber

Abstract

We present a microstructured fiber whose 9 µm diameter core consists in three concentric rings made of three active glasses having different rare earth oxide dopants, Yb3+/Er3+, Yb3+/Tm3+ and Yb3+/Pr3+, respectively. Morphological and optical characterization of the optical fiber are presented. The photoluminescence spectrum is investigated for different pumping conditions using a commercial 980 nm laser diode. Tuning of the RGB (or white light) emission is demonstrated not only by adjusting the pump power but also by using an optical iris as spatial filter which, thanks to the microstructured core, also acts as a spectral filter.

Ligand-Driven and Full-Color-Tunable Fiber Source: Toward Next-Generation Clinic Fiber-Endoscope Tomography with Cellular Resolution

“…It is noteworthy that as much as ∼1.2 mW (white light) and ∼1.6 mW (green light) of the output power were achieved, corresponding to optical-to-optical efficiencies of 4.7 and 6.6%, respectively. To our knowledge, these high conversion efficiencies are the highest among conventional glass fibers. − The high optical-to-optical conversion efficiency can be ascribed to the large emission cross-sections of the color centers produced by the odd-parity phonon vibrations . The emission cross-sections of the F- and F 2 -type color emitters in the sapphire crystal are 1–2 orders of magnitude higher than those found in typical transition-metal-doped sapphire − and YAG ,, wideband gain media (10 –23 m 2 vs 10 –21 –10 –22 m 2 ).…”

Er3+/Yb3+ co‐doped oxyfluoro tellurite glasses: Analysis of optical temperature sensing based on up‐conversion luminescence

“…Among the possible glassy materials, oxyfluoro tellurite glasses represent a suitable host matrix, due to their relatively low phonon energy, high refractive index, nonhygroscopic nature, substantial transparency in the infrared spectral region, considerable chemical durability, mechanical strength, and thermal stability. 20 These properties make them highly promising candidates as hosts to different rare-earth ions for investigation of UC luminescence and its optical temperature sensing ability. To the best of our knowledge, for Er 3+ Batches of 10 g were prepared by mixing high purity TeO 2 (99.9%), ZnO (99.9%), YF 3 (99.9%) NaF (99.99%), ErF 3 (99.99%), and YbF 3 (99.99%) as precursors and melted in a platinum crucible at 1050° for 30 min in an ambient atmosphere.…”

“…On the other hand, the materials able to host Er 3+ and Yb 3+ ions also play an important role in igniting the UC luminescence from Er 3+ ions. Among the possible glassy materials, oxyfluoro tellurite glasses represent a suitable host matrix, due to their relatively low phonon energy, high refractive index, nonhygroscopic nature, substantial transparency in the infrared spectral region, considerable chemical durability, mechanical strength, and thermal stability 20 . These properties make them highly promising candidates as hosts to different rare‐earth ions for investigation of UC luminescence and its optical temperature sensing ability.…”

Ultra-broadband near-infrared emission in praseodymium ion doped germanium tellurite glasses for optical fiber amplifier operating at E-, S-, C-, and L-band

“…Germanium tellurite (NZPGT) glasses were demonstrated to possess good thermal stability, excellent flexibility, and medium-low phonon energy of $790 cm À1 , and have already been drawn into optical fibers successfully. [5][6][7] Moreover, germanium-containing glass fibers are seductive for gain-flatten amplifier by longperiod grating UV-writing. Hence, it is promising to develop Pr 3þ doped NZPGT glasses for potential ultra-broadband fiber amplifier.…”