Mid-infrared photoluminescence in small-core fiber of praseodymium-ion doped selenide-based chalcogenide glass

True mid-infrared Pr3+absorption cross-section in a selenide-chalcogenide host-glass

“…Moreover, during the numerical fitting we found that the [H-Se-] absorption coefficient bandshape in the range >3.5 m to  5.5 m was very sensitive (estimated  10 dB m -1 ) to the numerical fitting of the baseline (see Fig. 2(b)) around the 3.5 m satellite [H-Se-] band in the loss spectrum of the 500 ppmw Pr 3+ -doped GeAsGaSe hostglass fibre [2]. This problem arises because the 3.…”

“…This strictly-kept ratio of four Gaußians was allowed to vary only in absolute terms (grow or shrink together) when used to help fit the observed combined {Pr 3+ + [H-Se-]} band of the Pr 3+ -doped GeAsGaSe bulk glass ( Fig. 3(a)) [2]; three more Gaußian bands [marked as 5, 6 and 7 on Figure 5. Absorption spectrum of a 6000 ppmw Dy 3+ doped GeAsGaSe bulk glass [5] (cf.…”

“…The Pr 3+ -doped GeAsGaSe core glass, doped with 500 ppmw Pr 3+ (9.46 x 10 19 ions cm -3 ), was directly drawn to unclad fibre for optical loss measurement across the MIR region; the fibre loss spectrum is shown here in Fig. 2(a)) [2].…”

“…1, were co-processed to make small-core, step-index fibre (SIF) [2]. This SIF exhibited Pr 3+ photoluminescence (PL) from 3.5-6 m wavelength and a long PL lifetime (7.8 ms) at 4.7 m, similar to that found in the bulk core glass [2], demonstrating that the local environment of Pr 3+ had been preserved in the fibre without RE clustering or glass-devitrification occurring, despite the intricate thermal processing required to make the SIF. , Dy 3+ has no ground state absorption in the 3.5-6 μm wavelength range.…”

Determining the refractive index dispersion and thickness of hot-pressed chalcogenide thin films from an improved Swanepoel method

“…The properties of mid-infrared (MIR) transparency, high refractive index, low phonon energy, high optical non-linearity (Zakery and Elliott 2003), and an ability to doped them with rare-earth element ions (Sanghera and Aggarwal 1999;Sanghera et al 2009;Tang et al 2015;Falconi et al 2016), make chalcogenide glasses attractive for use in planar photonic integrated circuits (Seddon et al 2006Abdel-Moneim et al 2015), and narrow-and broad-band fibre-based laser sources (Petersen et al 2014) and amplifiers (Hu et al 2015;Falconi et al 2017) for the MIR. Although much research effort has been paid to the development and characterisation of chalcogenide glasses for photonics, relatively little refractive index dispersion data are presently available at MIR wavelengths, see for example: Orava et al (2009), Qiao et al (2011), Dantanarayana et al (2014), Gleason et al (2016), Wang et al (2017) and references therein.…”