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Photoluminescence spectra are investigated in erbium‐doped GaLaS(O) glasses. Under optical pumping by a semiconductor laser diode operating at 808 nm, the samples demonstrate intense “green” emission bands centered at around 525 and 550 nm as well as much weaker “red” emission band centered at around 664 nm. The intensities of “green” and “red” emission bands are investigated as a function of pumping...
Considerable efforts have been made in the search for new photovoltaic (PV) materials that satisfy requirements such as low toxicity, optimum energy gap, high stability as well as the ability to synthesize by a wide range of methods. Tin (II) monosulfide (SnS), a binary metal (IV-VI) compound semiconductor offers many attributes. SnS is a p-type with high optical absorption coefficient >104 cm−1...
We study plasmonic metal-cored glass fibres where, upon pulsed laser excitation, the coupling between plasmonic and dielectric modes induces strong light collimation and suppression of nonlinear absorption, providing a novel platform for tunable fiberized sources and sensors.
A series of gallium lanthanum sulphide (GLS) glasses has been studied in order to ascertain properties across the entire glass forming region. This is the first comprehensive study of GLS glass over a wide compositional range.
Fluorescence is reported in waveguides fabricated via the ultrafast laser inscription technique in Erbium doped Gallium Lanthanum Sulphide (Er3+:GLS) for mid-infrared laser applications. The pump wavelength was 980nm leading to mid-infrared transition at 2.75 μm.
High contrast GeTe4 channel waveguides were fabricated on silicon with a ZnSe isolation layer using the lift-off technique. Waveguiding in these channels was demonstrated in the mid-wave and long-wave infrared spectral regions. The results of numerical modelling on the optical loss with different isolation layer thicknesses are also briefly discussed.
The 4I9/2–4I13/2 emission band of Er3+ is potentially interesting for CH4 detection because it can overlap with the optical absorption band of CH4. GaLaS and GeGaS glasses doped with Er3+ ions show the desirable emission under 808nm excitation. An attempt of spectrally shifting 4I9/2–4I13/2 emission band by substituting S by O or Se to obtain a perfect match to the absorption band of CH4 leads to...
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