Laser emission in Nd³⁺doped barium–titanium–silicate microspheres under continuous and chopped wave pumping in a non-coupled pumping scheme

Abstract

Laser action using non-coupled excitation and detection of microspheres made of Nd 3+ doped barium-titanium-silicate glass has been demonstrated and measured. The microspheres have also been successfully deposited over Si 3 N 4 strip waveguides with a SiO 2 separation layer, thus enabling the laser emission extraction onto a CMOS compatible photonic circuit. The dynamics of the lasing wavelength and intensity has been studied as a function of the pump power and interpreted in terms of thermal effects generated through non-radiative recombination of the excited ions.

Fluorescent and lasing whispering gallery mode microresonators for sensing applications

“…Rare‐earth doped microspheres are also commonly used although most of the research undertaken with such resonators still employs a fiber taper for evanescent coupling. In comparison, the few free space coupled experiments reported in the literature have displayed lower performance , although some interesting opportunities have still been identified notably by Kishi et al . who introduced a “terrace” structure, which breaks the microsphere symmetry to achieve quasi‐single mode output lasing .…”

Fabrication and properties of rare‐earth‐doped optical fiber using barium as an alternate codopant

“…Similarly, Yb has been doped into modified silica host glass by various groups where the host glass doped with Al or P is further modified by adding minor quantities of dopants like, Y, La, etc. In this context, Ba has been used as modifier in the fabrication of different silicate glass containing RE ions ; very recently highly BaO‐doped silica glass has been fabricated through molten core method to investigate brillouin spectra of the same and Ba‐doping level in pure silica glass has been determined using MCVD‐solution doping technique . However, the use of Ba as alternate codopant instead of Al or P in silica glass for RE doping fabricated through MCVD‐solution doping technique is not yet reported.…”

High pressure tuning of whispering gallery mode resonances in a neodymium-doped glass microsphere

“…This is glass that has been studied and is known to produce transparent glass-ceramics by conventional thermal treatment or by laser heating [6], with high nonlinear coefficients [7]. The Nd 3 -doped BTS microspheres also have shown laser emission [8]. In previous work, the possibility of using the Nd 3 -doped BTS glass microspheres as optical temperature sensors was studied [4].…”