Whispering gallery mode assisted random lasing in dye-doped PVA coated silica microsphere

2018 ◽  
Author(s):  
Priyanka S. Choubey ◽  
Shailendra . Varshney ◽  
Shivakiran Bhaktha B. N.
Keyword(s):  
Whispering Gallery Mode ◽  
Random Lasing ◽  
Silica Microsphere ◽  
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.

scholarly journals Tailoring Whispering Gallery Lasing and Random Lasing in A Compound Cavity

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 656 ◽  
Author(s):  
Zhiyang Xu ◽  
Junhua Tong ◽  
Xiaoyu Shi ◽  
Jinxiang Deng ◽  
Tianrui Zhai
Keyword(s):  
Chemical Etching ◽  
Optical Pumping ◽  
Whispering Gallery Mode ◽  
Random Structure ◽  
Light Sources ◽  
Random Lasing ◽  
Laser Device ◽  
Whispering Gallery ◽  
Sensing Applications ◽  
Metal Assisted Chemical Etching

A compound cavity was proposed to achieve both whispering gallery mode (WGM) lasing and random lasing. The WGM-random compound cavity consisted of a random structure with an annular boundary, which was fabricated by a method combining both inkjet printing and metal-assisted chemical etching methods. An ultrathin polymer membrane was attached to the WGM-random compound cavity, forming a polymer laser device. A transformation from WGM lasing to random lasing was observed under optical pumping conditions. The laser performance could be easily tailored by changing the parameter of the WGM-random compound cavity. These results provide a new avenue for the design of integrated light sources for sensing applications.

scholarly journals Broadband Frequency-Tunable Whispering-Gallery-Mode Superradiant Light from Quantum Dots in Colloidal Solution

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Mohamad S. AlSalhi ◽  
Saradh Prasad ◽  
Mamduh J. Aljaafreh ◽  
Ahmad H. S. Othman
Keyword(s):  
Quantum Dots ◽  
Pump Energy ◽  
Tunable Laser ◽  
Spectral Width ◽  
Whispering Gallery Mode ◽  
Silica Microsphere ◽  
High Q ◽  
Whispering Gallery ◽  
Liquid Laser ◽  
Frequency Tunable

We examine superradiant (SR) light or amplified spontaneous emission (ASE) from a whispering-gallery-mode (WGM) laser comprising various sized (CdSe) ZnS quantum dots (QDs) in colloidal liquid. Laser-induced fluorescence (LIF) with a full width at half maximum (FWHM) of 40 nm is observed when the colloidal QD system is pumped with 2 mJ of laser light at 355 nm (3rd harmonic of Nd:YAG laser). Under optimal conditions of pump energy and focusing, ASE at 520 nm with a bandwidth of Δλ=8 nm (FWHM) and divergence of 9 mrad is observed. When the QDs are embedded on a high-Q factor silica microsphere ((functionalized with an amine), SMA), they generate WGMs with random peak distributions. Finally, when all the QDs embedded in SMAs are mixed and placed in a cuvette, we obtain a “WGM laser” that is almost continuously tunable from 520 nm to 630 nm with a spectral width less than 2 nm (FWHM) in the WGM and less than 1.2 nm in the cavity mode. We believe that this is the first report on a frequency tunable laser obtained using (CdSe) ZnS QDs embedded in an SMA, exhibiting an efficiency of 0.06%.

A STRUCTURE FOR COUPLING WHISPERING GALLERY MODE WITH SURFACE PLASMONS

2010 ◽  
Vol 19 (04) ◽  
pp. 811-817
Author(s):  
KENZO YAMAGUCHI ◽  
MASAMITSU FUJII ◽  
MITSUO FUKUDA
Keyword(s):  
Surface Plasmons ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Silver Film ◽  
Three Dimensional ◽  
Whispering Gallery Mode ◽  
Silica Microsphere ◽  
Whispering Gallery ◽  
Novel Structure ◽  
Difference Time

The three-dimensional finite-difference time-domain method was used to demonstrate a novel structure for coupling whispering gallery mode (WGM) with surface plasmons (SPs). As for this structure, a micrometer-sized optical resonator composed of a silver film coated on a silica microsphere containing apertures is set on a glass substrate. The SPs couple with higher-order WGM, and their intensity is clearly enhanced by this structure.

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