Nd³⁺‐Doped Lead Boro Selenate Glass: A New Efficient System for Near‐Infrared 1.06 μm Laser Emission

Abstract

SeO 2 glasses are potential candidates for the applications in electrical and magnetooptical sensors, in catalysis and in a variety of semiconductor devices. These are also good infrared (IR) transmitters [1-3] and are being extensively used in photonic and non-linear optical devices. However, selenium oxide is an incipient glass former. It takes part in the glass formation only in combination with modifiers and conventional glass formers, e.g., borate, phosphate, silicate, and so on. Interestingly, during glass forming, the Se ion's coordination number (CN) varies from 4 to 3. The ions with CN 3 form quarantined selenite [SeO 3 ] 2À units, act as modifiers, and introduce internal chaos in the glass network; [4] such deaugmentation of the network paves the way for the enhancement of luminescence efficiency of dopant rare-earth (RE) ions by inhibiting the phonon losses. In contrast, the Se ions with CN 4 form selenate [SeO 4 ] 2À groups and alternate with BO 4 units in the glass network. In selinte (SeO 3) structural groups, out of 4p-electrons of Se, two electrons (of 4p-orbitals) join with with O À ions through covalent bondings, whereas the third 4p-orbital contains lone pair of electrons. Electronic polarizability of this oxide is expected to

Modification of free-volume defects in the GaS2–Ga2S3–CsCl glasses

“…However, the structure of such modified glasses associated with free-volume defects has not been fully investigated in all aspects of its manifestation, which significantly limits further progress in modern IR photonics. It is known that the closest arrangement of atoms in glass and nanomaterials can be adequately investigated using numerous experimental measurement methods [21][22][23][24][25][26][27][28][29][30][31][32]. However, the row of experimental probes available to study atomic-deficient void structure of such materials is rather limited, especially at nanometer and subnanometer scale.…”