scholarly journals In-Band Pumped Thulium-Doped Tellurite Glass Microsphere Laser

2021 ◽  
Vol 11 (12) ◽  
pp. 5440
Author(s):  
Elena A. Anashkina ◽  
Vitaly V. Dorofeev ◽  
Alexey V. Andrianov
Keyword(s):  
Tellurite Glass ◽  
High Gain ◽  
Glass Microsphere ◽  
Ion Concentration ◽  
Laser Generation ◽  
Q Factor ◽  
Narrow Line ◽  
Simple Theoretical Model ◽  
Q Factors ◽  
Doped Glass

Microresonator-based lasers in the two-micron range are interesting for extensive applications. Tm3+ ions provide high gain; therefore, they are promising for laser generation in the two-micron range in various matrices. We developed a simple theoretical model to describe Tm-doped glass microlasers generating in the 1.9–2 μm range with in-band pump at 1.55 μm. Using this model, we calculated threshold pump powers, laser generation wavelengths and slope efficiencies for different parameters of Tm-doped tellurite glass microspheres such as diameters, Q-factors, and thulium ion concentration. In addition, we produced a 320-μm tellurite glass microsphere doped with thulium ions with a concentration of 5·1019 cm−3. We attained lasing at 1.9 μm experimentally in the produced sample with a Q-factor of 106 pumped by a C-band narrow line laser.

Comparative Spectroscopic Studies on Luminescence Performance of Er3+ Doped Tellurite Glass Embedded with Different Nanoparticles (Ag Co and Fe) at 0.55 μm Emission

2021 ◽  
Vol 317 ◽  
pp. 81-86
Author(s):  
Syariffah Nurathirah Syed Yaacob ◽  
Md. Rahim Sahar ◽  
Faizani Mohd Noor ◽  
Nur Liyana Amiar Rodin ◽  
Siti Khadijah Mohd Zain ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Ground State ◽  
Tellurite Glass ◽  
Spectroscopic Studies ◽  
The Other ◽  
X Ray Diffraction ◽  
Melt Quenching ◽  
X Ray ◽  
Doped Glass ◽  
Luminescence Performance

The spectroscopic performance of Er3+ doped glass at 0.55 mm emission contain different nanoparticles NPs have been comparatively evaluated. Glass containing 1.0 mol % of Er3+ doped with different NPs (Ag, Co and Fe ) have been prepared using melt quenching technique. X-ray diffraction analysis reveals the all the prepared samples are amorphous. The UV-Vis absorption spectra of all glasses show several prominent peaks at 525 nm, 660 nm, 801nm, 982 nm and 959 nm due to transition from ground state 4I15/2 to different excited of 2H11/2, 4F9/2, 4I9/2, 4I11/2, and 4I13/2. The emission of Er3+ at 0.55 mm for glass contain Ag NP shows significant enhancement about 3 folds up to 0.6 mol%. On the other hand, the emission of Er3+ at 0.55 mm for glass containing Fe NPs and Co NPs intensely quench probably due to the energy-transfer from Er3+ ion to NPs and magnetic contributions.

AC Loss Modeling in Ba0.5Sr0.5TiO3 Using Dielectric Relaxation

2004 ◽  
Vol 833 ◽  
Author(s):  
Nadia K. Pervez ◽  
Jiwei Lu ◽  
Susanne Stemmer ◽  
Robert A. York
Keyword(s):  
Dielectric Loss ◽  
Dielectric Relaxation ◽  
Power Law ◽  
Fractional Power ◽  
Ac Loss ◽  
Dielectric Susceptibility ◽  
Network Analyzer ◽  
Q Factor ◽  
Relaxation Model ◽  
Q Factors

ABSTRACTIn universal relaxation, a material's complex dielectric susceptibility follows a fractional power law f1-n where 0 < n < 1 over multiple decades of frequency. In a variety of materials, including Ba0.5Sr0.5Ti03, dielectric relaxation has been observed to follow this universal relaxation model with values of n close to 1. In this work we have shown that the universal relaxation model can be used to calculate dielectric loss even when n is very close to 1. Our calculated Q-factors agree with measured values at 1 MHz; this agreement suggests that this technique may be used for higher frequencies where network analyzer measurements and electrode parasitics complicate Q-factor determination.

Compositional effect of WO3, MoO3, and P2O5 on Raman spectroscopy of tellurite glass for broadband and high gain Raman amplifier

2012 ◽  
Vol 111 (10) ◽  
pp. 103511 ◽  
Author(s):  
J. Yuan ◽  
Q. Yang ◽  
D. D. Chen ◽  
Q. Qian ◽  
S. X. Shen ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Tellurite Glass ◽  
High Gain ◽  
Compositional Effect ◽  
Raman Amplifier

S-band Tm[sup 3+]-doped tellurite glass microsphere laser via a cascade process

2004 ◽  
Vol 85 (19) ◽  
pp. 4325 ◽  
Author(s):  
Kiyotaka Sasagawa ◽  
Zen-o Yonezawa ◽  
Ryuta Iwai ◽  
Jun Ohta ◽  
Masahiro Nunoshita
Keyword(s):  
Tellurite Glass ◽  
Glass Microsphere ◽  
Cascade Process

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

2013 ◽  
Vol 30 (12) ◽  
pp. 3254 ◽  
Author(s):  
L. L. Martin ◽  
S. F. León-Luis ◽  
C. Pérez-Rodríguez ◽  
I. R. Martín ◽  
U. R. Rodríguez-Mendoza ◽  
...  
Keyword(s):  
High Pressure ◽  
Whispering Gallery Mode ◽  
Glass Microsphere ◽  
Whispering Gallery ◽  
Pressure Tuning ◽  
Doped Glass

scholarly journals A PHYSICAL THEORY OF ACID ANION DISPLACEMENT AND RECOVERY FOLLOWING EXERCISE

1944 ◽  
Vol 27 (3) ◽  
pp. 155-165
Author(s):  
Manuel F. Morales ◽  
Nathan W. Shock
Keyword(s):  
Experimental Data ◽  
Blood Plasma ◽  
Physical Theory ◽  
Close Agreement ◽  
Extracellular Fluid ◽  
Ion Concentration ◽  
Acid Anion ◽  
Simple Theoretical Model ◽  
Predicted Values ◽  
Anion Displacement

A simple theoretical model has been presented whose behavior duplicates the variation in bicarbonate ion concentration in the blood following exercise. Methods for the evaluation of the constants of rational equations to describe the concentration in muscle cells, in blood plasma, and in removal cells, of the anions produced in exercise have been devised. These methods have been applied to experimental data from 23 experiments, and a close agreement between the observed and theoretically predicted values for blood plasma has been found. From the mathematical analysis of the data values for permeability of acid anions produced in exercise have been estimated as 75 x 10–5 and 5.9 x 10–5 cm. per sec. between muscle cell and blood (extracellular fluid) and between blood plasma and removal cells respectively.

Fiber-taper-coupled L-band Er3+-doped tellurite glass microsphere laser

2003 ◽  
Author(s):  
Xiang Peng ◽  
Feng Song ◽  
Shibin Jiang ◽  
Makoto Gonokami ◽  
Nasser Peyghambarian
Keyword(s):  
Tellurite Glass ◽  
Glass Microsphere ◽  
Fiber Taper ◽  
L Band

Fiber-taper-coupled L-band Er3+-doped tellurite glass microsphere laser

2003 ◽  
Vol 82 (10) ◽  
pp. 1497-1499 ◽  
Author(s):  
Xiang Peng ◽  
Feng Song ◽  
Shibin Jiang ◽  
N. Peyghambarian ◽  
Makoto Kuwata-Gonokami ◽  
...  
Keyword(s):  
Tellurite Glass ◽  
Glass Microsphere ◽  
Fiber Taper ◽  
L Band

scholarly journals High Quality-Factor Dual-Band Fano Resonances Induced by Bound States in The Continuum Using A Planar Nanohole Slab

2021 ◽  
Author(s):  
Tian Sang ◽  
Qing Mi ◽  
Yao Pei ◽  
Chaoyu Yang ◽  
Shi Li ◽  
...  
Keyword(s):  
Bound States ◽  
Near Field ◽  
Dual Band ◽  
Q Factor ◽  
Fano Resonances ◽  
High Quality ◽  
Potential Applications ◽  
Q Factors ◽  
Symmetry Protected ◽  
The Continuum

Abstract In photonics, it is essential to achieve high quality (Q)-factor resonances to enhance light-mater interactions for improving performances of optical devices. Herein, we demonstrate that high Q-factor dual-band Fano resonances can be achieved by using a planar nanohole slab (PNS) based on the excitation of bound states in the continuum (BICs). By shrinking or expanding the tetramerized holes of the superlattice of the PNS, symmetry-protected BICs can be excited and the locations of Fano resonances as well as their Q-factors can be flexibly tuned. Physical mechanisms for the dual-band Fano resonances can be interpreted as the resonant couplings between the electric-toroidal dipoles or the magnetic-toroidal dipoles based on the far-field multiple decompositions and the near-field distributions of the superlattice. The dual-band Fano resonances of the PNS possess polarization independent feature, they can be survived even the geometric parameters of the PNS are significantly altered, making them more suitable for potential applications.

scholarly journals High Q Resonant Graphene Absorber with Lossless Phase Change Material Sb2S3

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2820
Author(s):  
Qi Meng ◽  
Xingqiao Chen ◽  
Wei Xu ◽  
Zhihong Zhu ◽  
Shiqiao Qin ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Near Infrared ◽  
Infrared Region ◽  
Q Factor ◽  
Thermal Emitters ◽  
Crystallization Fraction ◽  
Q Factors ◽  
Refractive Index Grating ◽  
Change Material

Graphene absorbers have attracted lots of interest in recent years. They provide huge potential for applications such as photodetectors, modulators, and thermal emitters. In this letter, we design a high-quality (Q) factor resonant graphene absorber based on the phase change material Sb2S3. In the proposed structure, a refractive index grating is formed at the subwavelength scale due to the periodical distributions of amorphous and crystalline states, and the structure is intrinsically flat. The numerical simulation shows that nearly 100% absorption can be achieved at the wavelength of 1550 nm, and the Q factor is more than hundreds due to the loss-less value of Sb2S3 in the near-infrared region. The absorption spectra can be engineered by changing the crystallization fraction of the Sb2S3 as well as by varying the duty cycle of the grating, which can be employed not only to switch the resonant wavelength but also to achieve resonances with higher Q factors. This provides a promising method for realizing integrated graphene optoelectronic devices with the desired functionalities.

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