Highly efficient and ultra-narrow bandwidth orange emissive carbon dots for microcavity lasers

Nanoscale ◽  
2019 ◽  
Vol 11 (24) ◽  
pp. 11577-11583 ◽  
Author(s):  
Zhixia Han ◽  
Yiqun Ni ◽  
Junkai Ren ◽  
Wenfei Zhang ◽  
Yunfeng Wang ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Whispering Gallery Mode ◽  
Gain Medium ◽  
Full Width ◽  
Solid State Lasers ◽  
Microcavity Lasers ◽  
Laser Gain ◽  
Whispering Gallery ◽  
Narrow Bandwidth ◽  
First Time

Orange emissive carbon dots with 82% PL quantum yield and 30 nm full width at half maximum are utilized as a laser gain medium to realize whispering gallery mode solid state lasers for the first time.

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 Microscale whispering-gallery-mode light sources with lattice-confined atoms

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Deshui Yu ◽  
Frank Vollmer
Keyword(s):  
Precision Measurement ◽  
Quantum Information Processing ◽  
Photon Emission ◽  
Earth Metal ◽  
Coupled System ◽  
Whispering Gallery Mode ◽  
Gain Medium ◽  
Light Sources ◽  
Whispering Gallery ◽  
Ring Shape

AbstractMicrolasers, relying on the strong coupling between active particles and optical microcavity, exhibit fundamental differences from conventional lasers, such as multi-threshold/thresholdless behavior and nonclassical photon emission. As light sources, microlasers possess extensive applications in precision measurement, quantum information processing, and biochemical sensing. Here we propose a whispering-gallery-mode microlaser scheme, where ultracold alkaline-earth metal atoms, i.e., gain medium, are tightly confined in a two-color evanescent lattice that is in the ring shape and formed around a microsphere. To suppress the influence of the lattice-induced ac Stark shift on the moderately-narrow-linewidth laser transition, the red-detuned trapping beams operate at a magic wavelength while the wavelength of the blue-detuned trapping beam is set close to the other magic wavelength. The tiny mode volume and high quality factor of the microsphere ensure the strong atom-microcavity coupling in the bad-cavity regime. As a result, both saturation photon and critical atom numbers, which characterize the laser performance, are substantially reduced below unity. We explore the lasing action of the coupled system by using the Monte Carlo approach. Our scheme may be potentially generalized to the microlasers based on the forbidden clock transitions, holding the prospect for microscale active optical clocks in precision measurement and frequency metrology.

scholarly journals Observation of polarized gain from aligned colloidal nanorods

Nanoscale ◽  
2015 ◽  
Vol 7 (15) ◽  
pp. 6481-6486 ◽  
Author(s):  
Yuan Gao ◽  
Van Duong Ta ◽  
Xin Zhao ◽  
Yue Wang ◽  
Rui Chen ◽  
...  
Keyword(s):  
Capillary Tube ◽  
Whispering Gallery Mode ◽  
Gain Medium ◽  
Whispering Gallery

We demonstrated the highly polarized whispering-gallery mode lasing from aligned nanorods as a polarized gain medium formed in a capillary tube.

Five-photon absorption upconversion lasing from on-chip whispering gallery mode

Nanoscale ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 6130-6136 ◽  
Author(s):  
Ying Huang ◽  
Hai Zhu ◽  
Huying Zheng ◽  
Ziying Tang ◽  
Jianwen Dong ◽  
...  
Keyword(s):  
Room Temperature ◽  
Whispering Gallery Mode ◽  
Photon Absorption ◽  
Whispering Gallery ◽  
Low Threshold ◽  
On Chip ◽  
First Time

We demonstrated for the first time low-threshold whispering-gallery mode upconversion lasing through five-photon absorption enhanced by on-chip microcavities at room temperature.

Whispering gallery mode laser based on antitumor drug–dye complex gain medium

2012 ◽  
Vol 37 (22) ◽  
pp. 4756 ◽  
Author(s):  
Fernando Lahoz ◽  
Claudio J. Oton ◽  
David López ◽  
Jorge Marrero-Alonso ◽  
Alicia Boto ◽  
...  
Keyword(s):  
Whispering Gallery Mode ◽  
Gain Medium ◽  
Antitumor Drug ◽  
Mode Laser ◽  
Whispering Gallery

Evaluation of Effective Conductivity of Copper-Clad Dielectric Laminate Substrates in Millimeter-Wave Bands Using Whispering Gallery Mode Resonators

2009 ◽  
Vol E92-C (12) ◽  
pp. 1504-1511 ◽  
Author(s):  
Thi Huong TRAN ◽  
Yuanfeng SHE ◽  
Jiro HIROKAWA ◽  
Kimio SAKURAI ◽  
Yoshinori KOGAMI ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Effective Conductivity ◽  
Whispering Gallery Mode ◽  
Whispering Gallery
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