On a quality factor of whispering gallery mode dielectric resonators in a form of cone

2007 ◽  
Vol 49 (8) ◽  
pp. 1987-1989 ◽  
Author(s):  
Nickolay T. Cherpak ◽  
Sergey A. Bunyaev ◽  
Alexander A. Barannik
Keyword(s):  
Quality Factor ◽  
Whispering Gallery Mode ◽  
Dielectric Resonators ◽  
Whispering Gallery

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.

Boundary rounding effect in the hexagonal and oval two-dimensional optical microcavity

2021 ◽  
pp. 2150146
Author(s):  
Canran Zhang ◽  
Jun Dai
Keyword(s):  
Quality Factor ◽  
Whispering Gallery Mode ◽  
Circular Cavity ◽  
Structure Parameter ◽  
The Finite Element Method ◽  
Optical Mode ◽  
Optical Microcavity ◽  
Whispering Gallery ◽  
Mode Pattern ◽  
Simulation Results

In this paper, the boundary rounding effects of two types of non-circular GaN microcavity system are numerically simulated by the finite element method. When the rounding parameter [Formula: see text] of the hexagonal microcavity decreases, the six corners of the regular hexagon are gradually rounded, the results show that the optical mode gradually changes from the hexagonal whispering-gallery mode (WGM) to the perfect circular WGM, and the quality factor of the modes increases correspondingly. For the oval microcavity, the structure parameter [Formula: see text] increases from 0 to 1 when the oval microcavity gradually changes from a stadium cavity to a circular cavity. The simulation results show that the quality factor increases with [Formula: see text], and the optical mode changes from high-leak mode to WGM. Our results demonstrate the effect of the boundary rounding on the mode pattern and quality factor in hexagonal and oval microcavities.

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