Nd-doped Silicate Glass Research Articles

Phosphor in glass using β-SiAlON:Eu2+, CaAlSiN3:Eu2+ and Nd-doped silicate glass for enhanced color gamut of white LED

A phosphor-in-glass (PiG) was fabricated to realize a robust white light emitting diode (wLED) with wide color gamut. β-SiAlON:Eu2+ and CaAlSiN3:Eu2+ were employed for the green and red phosphors, respectively. Nd2O3 doped silicate glass was used to reduce the emission bandwidths of the phosphors, utilizing the hypersensitive transition of Nd3+: 4I9/2 → 4G5/2, 2G7/2. The content of green and red phosphors was varied to produce a white emission. The emission spectra, color coordinates and color gamuts of the wLEDs with the PiGs were examined by varying phosphors and Nd2O3 content. A wLED with 5 mol% Nd2O3 doped glass had an enhanced color gamut up to 88%. The thermal stability of the PiGs was also monitored to demonstrate its practical feasibility as a white light source in display applications.

Compact Single-Mode Nd-Doped Silicate Glass Multitrench Fiber With 40 μm Core Diameter

We report a 40 μm core-diameter single-mode multitrench fiber (MTF) based on Nd-doped silicate glass. Both the delocalization effect and leaky nature were considered in the design of the MTF. The silicate MTF was designed and fabricated using the rod-in-tube method. A maximum laser output power of ∼8.4 W with a slope efficiency of 54% was obtained from a 10-cm-long single-mode MTF.

Very Large-Mode-Area, Symmetry-Reduced, Neodymium-Doped Silicate Glass All-Solid Large-Pitch Fiber

This paper reports, for the first time to our knowledge, a very large-mode-area, Nd-doped silicate glass all-solid large-pitch fiber (AS-LPF) with a core diameter of up to 75 μm. The concepts of the delocalization effect and differential loss were considered simultaneously to evaluate the single-mode operation of the AS-LPF. By reducing the symmetry of the fiber, the single-mode operation of the 75-μm AS-LPF was theoretically predicted using the finite-difference time-domain method and was experimentally fabricated. An output power of ∼9.3 W with a slope efficiency of 41% was obtained for a 60-cm-long fiber.

Silicate Glass All-Solid Photonic Bandgap Crystal Fiber

The realization of an all-solid photonic bandgap optical fiber (PBGF) based on silicate glasses in spectral wavelength band ~920 nm is achieved. The structure parameters and bandgap of the fiber are both demonstrated theoretically by plane-wave expansion method calculations and experimentally by near-field measurements. The all-solid silicate glass PBGF has one bandgap and has a core transmission band of 853-980 nm, which is important for laser generation at ~920 nm in Nd-doped silicate glass fiber.

Resonant effects in nonlinear photon absorption during femtosecond laser ablation of Nd-doped silicate glass

This study investigates the resonant effects in nonlinear photon absorption in femtosecond laser ablation of Nd-doped silicate glass (Nd:glass). During the femtosecond laser ablation process, the resonant ablation threshold fluence is decreased by up to 40% compared with that of ordinary ablation. However, it is found that the resonant effect is closely related with laser intensity, and lower laser intensities are required to achieve a significant enhancement. When the intensity is lower than 2.28×10(14) W/cm(2) at which multiphoton ionization dominates, resonant effect is enhanced by a factor of 1.4 to 4.4. When the intensity is higher than 2.28×10(14) W/cm(2), at which intensity tunnel ionization dominates, the resonant effect becomes weak and gradually fades away. It is shown that the resonant effect is still important for multiphoton ionization yet insignificant for tunnel ionization.

Laser Action From an Ultrafast Laser Inscribed Nd-Doped Silicate Glass Waveguide

We report single-transverse-mode laser oscillation from waveguides inscribed in a commercially available Nd-doped silicate glass substrate using an ultrafast fiber laser operating at 1064 nm. When pumped at 808 nm, laser action was observed at 1062 nm, with a slope efficiency of 15.0% and a maximum output power of 7.5 mW. Analysis of the laser performance implied a waveguide loss of 0.17 ± 0.06 dB · cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> .

The influence of the inhomogeneous gain profile on the spatio-temporal dynamics ofbroad-area class B lasers

A study on the spatio-temporal dynamics of broad-area Nd:YAG (yttrium aluminiumgarnet), Nd-doped phosphate glass and Nd-doped silicate glass lasers is presented to showthe influence of the inhomogeneous gain profile and cross-relaxation phenomena on thespatio-temporal dynamics of the system. The suppression of the order–disorder transitionshown in Cabrera et al (2006 Opt. Lett. 31 1067) for homogeneously broadened class B lasersis found for both glass lasers, independently of the strength of the cross-relaxationmechanisms. The results obtained indicate that a higher degree of inhomogeneousbroadening leads to suppression of the filamentation in the transverse intensity pattern.

Optical waveguide amplifier in Nd-doped glass written with near-IR femtosecond laser pulses

A near-IR (775 nm) femtosecond laser has been used to directly write a 1 cm long optical waveguide in Nd-doped silicate glass. A gain of 1.5 dB/cm was obtained at a signal wavelength of 1054 nm for ~346 mW of 514 nm pump power, in front of the input coupling objective.

Y-branch waveguide glass laser and amplifier

A Y-branch channel waveguide laser operating near 1057 nm was fabricated by electric-field-assisted ion exchange in Nd-doped silicate glass. The overall length was 24 mm. Optical pumping was performed with a cw Ti:sapphire laser. Mirrors were bonded to the polished waveguide facets. The slope efficiency was 5.1% when a 4%-transmitting output coupler was used. Threshold was reached at 26-mW absorbed pump power. The device exhibited a single-pass small-signal gain of 0.034 dB/mW when operated as an amplifier. The 3-dB splitting loss of the Y-branch structure was overcome when the absorbed pump power was approximately 85 mW.

Absorption and emission spectra in chalcogenide glass of the composition 0.7Ga 2S 3·0.27La 2S 3·0.03Nd 2S 3

Chalcogenide glasses of the composition 0.7Ga 2S 3·0.27La 2S 3·0.03Nd 2S 3 doped by 3 mol% of Nd 3+ were prepared. The absorption and emission spectra of these glasses were compared to those of commercial ED-2 3.1 wt.% Nd-doped silicate glass. The absorption intensities of Nd 3+ in chalcogenide glass are higher than in silicate glass due to the increasing covalency of Nd 3+ in these glasses. Because of the low phonon frequency of the chalcogenide glasses nonradiative relaxations from the 4F 5 2 , 2H 9 2 to the 4F 3 2 are lower than in other oxide glasses and so fluorescence from this state is observed.