Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: germanate glass

Sortuj według:

Ogranicz wyniki do:

Broadband fluorescence emission and laser demonstration in large mode waveguide structure in Yb3+ doped germanate glass

Khalid Mamoona

Optica Applicata

2021

Vol. 51, nr 1

75--85

A stable composition (against crystallization) of germanate glass doped with Yb3+ for mid-infrared laser applications is presented. Broad emission spectrum of Yb3+ was obtained for the fabricated glass. Laser operation was demonstrated in 13 mm long waveguide written in the glass using a femtosecond laser operating at 524 nm center wavelength sending 250 fs ultrashort pulses. The resulting CW laser operated at 1.04 μm in the fundamental mode of the waveguide. The propagation loss through the waveguide was 0.6 dB/cm at 1550 nm for 45 μm diameter of the modified structure. The mode analysis of the developed waveguide structure is also presented in COMSOL Multiphysics to study the electric field distribution through different modes of propagation in the waveguide and the confinement loss associated to them.

Up-conversion luminescence in germanate glass and double-clad optical fibre co-doped with Yb3+/Eu3+ ions

Kochanowicz M., Zmojda J., Ragin T., Miluski P., Jelen P.

Opto-Electronics Review

2016

Vol. 24, No. 3

155--161

In the paper the analysis of up−conversion (UC) luminescence in 0.5Yb2O3/(0.25−1)Eu2O3 (mol.%) co−doped germanate glass and optical fibre has been investigated. Up−conversion emission of bands at 591, 616, 652, 701 nm to which correspond Eu3+: 5D0 7F1, 5D0 7F2, 5D0 7F3, 5D0 7F4 transitions, respectively was obtained as a result of cooperative energy transfer between Yb3+ and Eu3+ ions. The highest up−conversion emission (Yb3+ Eu3+ energy transfer efficiency ɲ= 24%) was obtained in 0.5Yb2O3/0.75Eu2O3 co−doped glass. Comparison of up−conversion and down−conversion luminescence spectra of bulk glass, glass fibre and different length double−clad optical fibre (up to 5 m) showed subtle differences in shape of the spectrum. In comparison to down – conversion emission (ʎexc = 405 nm) main UC luminescence band is red−shifted by 2 nm and is characterized by 5 nm greater full – width half – maximum (FWHM).