scholarly journals Temperature Sensing with Nd3+ Doped YAS Laser Microresonators

2021 ◽  
Vol 11 (3) ◽  
pp. 1117
Author(s):  
Daniel Walo-Martín ◽  
Franzette Paz-Buclatin ◽  
Susana Ríos ◽  
Inocencio R. Martín ◽  
Leopoldo L. Martin ◽  
...  
Keyword(s):  
Laser Emission ◽  
Fluorescence Intensity Ratio ◽  
Resolution Limit ◽  
Continuous Laser ◽  
Whispering Gallery ◽  
Different Temperatures ◽  
Power Threshold ◽  
Fir Technique ◽  
Upconversion Emissions ◽  
532 Nm

Yttria–alumina–silica (YAS) glass microspheres doped with Nd3+ ions were excited with a 532 nm continuous laser in order to study the dependency of the wavelength of the whispering gallery mode (WGM) peaks on the temperature of the sample. This was possible due to a previous calibration of the 808 nm and 890 nm emission bands of the Nd:YAS glass sample for different temperatures using the fluorescence intensity ratio (FIR) technique. A maximum sensitivity of 15 × 10−6 K−1 and a temperature resolution limit of 0.2 K were obtained for the microsphere sensor. Moreover, laser emission at 1064 nm was observed by continuous pumping at 532 nm, and a power threshold of 100 mW was determined. Upconversion emissions of Nd3+ were also studied by exciting the sample at 808 nm.

scholarly journals Phase-Shift Optimization in AA/PVA Photopolymers by High-Frequency Pulsed Laser

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1887
Author(s):  
Daniel Puerto ◽  
Sergi Gallego ◽  
Jorge Francés ◽  
Andrés Márquez ◽  
Inmaculada Pascual ◽  
...  
Keyword(s):  
Phase Shift ◽  
High Frequency ◽  
Large Scale ◽  
Pulsed Laser ◽  
Laser Exposure ◽  
Continuous Laser ◽  
Frequency Limit ◽  
Optical Elements ◽  
First Time ◽  
532 Nm

Photopolymers can be used to fabricate different holographic optical elements, although maximization of the phase-shift in photopolymers has been a challenge for the last few decades. Different material compositions and irradiation conditions have been studied in order to achieve it. One of the main conclusions has been that with continuous laser exposure better results are achieved. However, our results show for the first time that higher phase-shift can be achieved using a pulsed laser. The study has been conducted with crosslinked acrylamide-based photopolymers exposed with a pulsed laser (532 nm). The increment of the phase-shift between the pulsed laser and continuous laser exposure is 17%, achieving a maximum phase-shift of 3π radians and a refractive index shift of 0.0084 at the zero spatial frequency limit, where monomer diffusion does not take place. This allows this photopolymer to be used in large-scale manufacturing.

scholarly journals Whispering-Gallery-Mode for Coherent Random Lasing in a Dye-Doped Polystyrene Encapsulated Silica-Glass Capillary

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1578
Author(s):  
Kai Nie ◽  
Yueqi Wang ◽  
Zhenzhen Zhang ◽  
Gang Zou ◽  
Xiaolong Xu ◽  
...  
Keyword(s):  
Quality Factor ◽  
Silica Glass ◽  
Whispering Gallery Mode ◽  
Photonic Devices ◽  
Full Width ◽  
Random Lasing ◽  
Glass Capillary ◽  
New Approach ◽  
Whispering Gallery ◽  
532 Nm

Dye-doped polystyrene (DDPS) encapsulated in a silica-glass capillary with a diameter of 300 μm was fabricated through radical polymerization of styrene within the capillary. The coherent random lasing (RL) with full width at half maximum (FWHM) of 0.36 nm and a quality factor of 1608 was produced in the DDPS with the capillary when pumping at 532 nm. However, the incoherent RL with FWHM of 6.62 nm and a quality factor of 92 was produced in the DDPS without the capillary. A detailed investigation on this phenomenon by changing the diameter of the capillary and core refractive index (RI) reveals that there exists a strong whispering gallery mode (WGM) resonance in the capillary, which helps generate the coherent RL. The findings may open up a new approach for the fabrication of highly efficient photonic devices.

Observation of whispering-gallery and directional resonant laser emission in ellipsoidal microcavities

2006 ◽  
Vol 23 (9) ◽  
pp. 1793 ◽  
Author(s):  
Liangmin Zhang ◽  
You-Xiong Wang ◽  
Fajian Zhang ◽  
Richard O. Claus
Keyword(s):  
Laser Emission ◽  
Whispering Gallery ◽  
Resonant Laser

Experimental Results for Light-Induced Boiling in Water-Based Graphite Nanoparticle Suspensions

2009 ◽  
Author(s):  
Robert A. Taylor ◽  
Patrick E. Phelan ◽  
Ronald J. Adrian ◽  
Todd Otanicar ◽  
Ravi S. Prasher
Keyword(s):  
Base Fluid ◽  
Particle Diameter ◽  
Experimental Tests ◽  
High Energy ◽  
Single Step ◽  
Working Fluid ◽  
Particle Loading ◽  
Continuous Laser ◽  
Nanoparticle Suspensions ◽  
532 Nm

One relatively simple subset of nanotechnology is nanofluids, obtained by the addition of nanoparticles to a conventional base fluid. The promise of nanofluids stems from the fact that at relatively small particle loading (typically <1% by volume) significant enhancement in thermal transport may be possible [1–3]. Since there are a wide variety of nanoparticle materials to choose from, nanofluidic systems can be tuned to fit a number of applications. This research focuses on direct thermal collection of light energy using highly absorptive nanofluids. Experimental tests are conducted using a 0.1% by volume graphite/water (30nm nominal particle diameter) nanofluid exposed to a 130 mW, 532 nm, continuous laser. A lens is placed between the laser and the fluid to achieve a high-energy flux (∼ 490 Wcm−2). Since initially over 99.9% of the light is absorbed in a path length of 0.1 mm, the irradiated portion of the base fluid collects enough energy to vaporize. Heuristic methods of analysis demonstrate this situation incorporates several interesting modes of heat transfer and fluid mechanics. These experiments also reveal the possibility for novel solar collectors in which the working fluid directly absorbs energy and undergoes phase change in a single step.

scholarly journals Temperature and rhodamine B sensing based on fluorescence intensity ratio of Er3+ upconversion emissions

RSC Advances ◽  
2017 ◽  
Vol 7 (76) ◽  
pp. 48494-48500 ◽  
Author(s):  
Jin L. Wu ◽  
Bao S. Cao ◽  
Luis Rino ◽  
Yang Y. He ◽  
Zhi Q. Feng ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Rhodamine B ◽  
Intensity Ratio ◽  
Fluorescence Intensity Ratio ◽  
Upconversion Emissions

Fluorescence intensity ratio technique of upconversion emissions of Er3+ can be used for both temperature and RhB concentration sensing.

scholarly journals Intensive up-conversion photoluminescence of Er3+-doped Bi7Ti4NbO21 ferroelectric ceramics and its temperature sensing

2014 ◽  
Vol 04 (04) ◽  
pp. 1450028 ◽  
Author(s):  
Hua Zou ◽  
Jun Li ◽  
Qiufeng Cao ◽  
Xusheng Wang ◽  
Xinwei Hui ◽  
...  
Keyword(s):  
Single Phase ◽  
Temperature Sensing ◽  
Ferroelectric Ceramics ◽  
Fluorescence Intensity Ratio ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
Er Doping ◽  
Optical Thermometry ◽  
Bio Imaging ◽  
Fir Technique

The intensive up-conversion (UC) photoluminescence and temperature sensing behavior of Er 3+-doped Bi 7 Ti 4 NbO 21( BTN ) ferroelectric ceramics prepared by a conventional solid-state reaction technique have been investigated. The X-ray diffraction and field emission scanning electron microscope analyses demonstrated that the Er 3+-doped BTN ceramics are single phase and uniform flake-like structure. With the Er 3+ ions doping, the intensive UC emission was observed without obviously changing the properties of ferroelectric. The optimal emission intensity was obtained when Er doping level was 15 mol.%. The temperature sensing behavior was studied by fluorescence intensity ratio (FIR) technique of two green UC emission bands, and the experimental data fitted very well with the function of temperature in a range of 133–573 K. It suggested that the Er 3+-doped BTN ferroelectric ceramics are very good candidates for applications such as optical thermometry, electro-optical devices and bio-imaging ceramics.

A portable all-fiber thermometer based on the fluorescence intensity ratio (FIR) technique in rare earth doped TeO2–WO3–La2O3–Na2O glass

2018 ◽  
Vol 6 (26) ◽  
pp. 7063-7069 ◽  
Author(s):  
Yuyuan Tu ◽  
Shilong Zhao ◽  
Dongyang He ◽  
Ting Wu ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Glass Fiber ◽  
Fluorescence Intensity ◽  
Intensity Ratio ◽  
Temperature Sensing ◽  
Fluorescence Intensity Ratio ◽  
Fir Technique ◽  
Rare Earth Doped ◽  
Co Doped ◽  
Sensing Performance

A portable all-fiber thermometer based on the fluorescence intensity ratio technique in Er3+/Yb3+ co-doped TeO2–WO3–La2O3–Na2O (TWLN) glass fiber was designed and its temperature sensing performance was determined.

Highly reliable all-fiber temperature sensor based on the fluorescence intensity ratio (FIR) technique in Er3+/Yb3+ co-doped NaYF4 phosphors

2019 ◽  
Vol 7 (48) ◽  
pp. 15269-15275 ◽  
Author(s):  
Hui Zhang ◽  
Jiatao Ye ◽  
Xiuli Wang ◽  
Shilong Zhao ◽  
Ruoshan Lei ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Temperature Sensor ◽  
Intensity Ratio ◽  
Emission Spectra ◽  
Fluorescence Intensity Ratio ◽  
Feasible Method ◽  
Temperature Probe ◽  
Fir Technique ◽  
Co Doped

A simple and feasible method was used to fabricate the optical temperature probe. A point all-fiber temperature sensor was built based on the up-conversion emission spectra of Er3+/Yb3+ co-doped NaYF4 phosphors.

Sign in / Sign up

Export Citation Format

Share Document