A review of hollow core whispering gallery resonators (WGRs) is given. After a short
introduction to the topic of whispering gallery resonators we provide a description of …

Glass microsphere resonators that support optical resonances known as whispering‐gallery
modes are unique tools for studying and exploiting optical effects under extremely well …

Fluoride compounds have compelling advantages for many optical applications due to their
unique combination of low phonon energy, high UV absorption edge energy, and relatively …

Optical microcavities with ultralong photon storage times are of central importance for
integrated nanophotonics. To date, record quality (Q) factors up to 10 11 have been …

Ensemble and single particle studies of the excitation power density (P)-dependent
upconversion luminescence (UCL) of core and core-shell β-NaYF 4: Yb, Er upconversion …

We describe a novel method for making microbottle-shaped lasers by using a CO2 laser to
melt Er: Yb glass onto silica microcapillaries or fibres. This is realised by the fact that the two …

This work reports a microsphere laser at∼ 2.0 μm in a Tm 3+-doped ZrF 4-BaF 2-YF 3-AlF 3
(ZBYA) fluoride glass. The ZBYA glass microsphere was fabricated by reflowing the tip of a …

In lanthanide-sensitized upconversion (UC) nanomaterials, the typical sensitizer Yb3+ can
significantly modulate the codoped activator (such as Er3+ ions) to generate multiband …

Recently, erbium-doped nanomaterials have been demonstrated to achieve multiband
upconversion luminescence (UCL) via high excitation power and material alteration. In such …

Upconversion lasing and fluorescence from active microspheres fabricated from a novel
fluorozirconate, Er 3+ doped glass, ZBNA (⁠ ZrF 4–BaF 2–NaF–AlF 3⁠), when pumped at …