Two-photon luminescence thermometry: towards 3D high-resolution thermal imaging of waveguides

Abstract

Esta es la versión de autor del artículo publicado en: This is an author produced version of a paper published in: Abstract. We report on the use of erbium-based luminescence thermometry to realize high resolution, three dimensional (3D) thermal imaging of optical waveguides. Proof of concept is demonstrated in a 980-nm laser pumped ultrafast laser inscribed waveguide in an Er:Yb phosphate glass platform. Multi-photon microscopy images revealed the existence of well confined intra-waveguide temperature increments as large as 200 C for moderate 980 nm pump powers of 120 mW. Numerical simulations and experimental data reveal that thermal loading can be substantially reduced if pump events are separated more than the characteristic thermal time that for the waveguides investigated is in the millisecond time scale.

Lanthanide‐Based Thermometers: At the Cutting‐Edge of Luminescence Thermometry

“…After this period, the number of publications and corresponding citations has continued to grow exponentially, Figure a,b. Intriguing examples involving Ln 3+ ‐doped materials are in situ measurements to visualize temperature gradients in photonic devices, microelectronic and microfluidic chips, catalytic processes, dosimeters working in high‐energy radiation fields, and heated air jets and internal parts of combustion engines . Currently, luminescence thermometry lives its inflationary epoch, with a total number of papers (citations) representing ≈2.5% (2.0%) of the total number of papers (citations) published in the same period in the context of luminescence or luminescent systems, Figure c,d.…”

Optical Interpretation of a Second-Order Phase Transition Induced by Thermal-Driven Li+ Migration via Configurational Entropy in CaTiO3:Li+,Yb3+,Er3+

“…Understanding the migration of ions (formation of point defect) triggered by external fields such as heat or electric fields is a prerequisite for solid-state materials in the applications of lithium-ion batteries, oxide fuel cells, resistive random-access memory, , conductive glass, and so forth. For some optical materials, heat accumulation in high-power laser displays and lasing amplification, where the local temperature could reach 300 °C or higher, could lead to a severe deterioration of the device performance and even damage the critical component of optical materials. − The phenomenon of thermal-driven composition ion migration may be an alert prior to irreversible damage to the materials. Concerning that there is a plausible contribution of the mobile ions to the thermal transport in addition to the phonon with the absence of free electrons in the wide-band-gap optical materials, the thermal property is also vital to resist the thermal damage.…”

Overview of N‐Rich Antennae Investigated in Lanthanide‐Based Temperature Sensing

“…Te mperature gradientsa re visualized in for example photonic devices, microfluidics, micro-electronics, catalytic processes,a nd internal parts of combustion engines. [10][11][12][13][14][15] The application potentiali n the medicinal fields coversfor instanceinvivo thermalimaging and early tumor detection. [16][17][18][19][20][21] Current noncontact techniques are for example infrared thermography,t hermoreflectance and thermographic phosphor luminescence.…”