scholarly journals Observation of Critical Coupling in a Fiber Taper to a Silica-Microsphere Whispering-Gallery Mode System

2000 ◽  
Vol 85 (1) ◽  
pp. 74-77 ◽  
Author(s):  
Ming Cai ◽  
Oskar Painter ◽  
Kerry J. Vahala
Keyword(s):  
Whispering Gallery Mode ◽  
Critical Coupling ◽  
Silica Microsphere ◽  
Whispering Gallery ◽  
Fiber Taper

Experimental demonstration of critical coupling of whispering gallery mode cavities on a Bloch surface wave platform

2017 ◽  
Vol 42 (24) ◽  
pp. 5137 ◽  
Author(s):  
B. Vosoughi Lahijani ◽  
H. Badri Ghavifekr ◽  
R. Dubey ◽  
M.-S. Kim ◽  
I. Vartiainen ◽  
...  
Keyword(s):  
Surface Wave ◽  
Whispering Gallery Mode ◽  
Experimental Demonstration ◽  
Critical Coupling ◽  
Whispering Gallery ◽  
Bloch Surface Wave

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%.

Phase-matched excitation of whispering-gallery-mode resonances by a fiber taper

1997 ◽  
Vol 22 (15) ◽  
pp. 1129 ◽  
Author(s):  
J. C. Knight ◽  
G. Cheung ◽  
F. Jacques ◽  
T. A. Birks
Keyword(s):  
Whispering Gallery Mode ◽  
Whispering Gallery ◽  
Fiber Taper
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