scholarly journals Conformable Nanowire-in-Nanofiber Hybrids for Low-Threshold Optical Gain in the Ultraviolet

ACS Nano ◽  
2020 ◽  
Vol 14 (7) ◽  
pp. 8093-8102
Author(s):  
Alberto Portone ◽  
Rocio Borrego-Varillas ◽  
Lucia Ganzer ◽  
Riccardo Di Corato ◽  
Antonio Qualtieri ◽  
...  
Keyword(s):  
Optical Gain ◽  
Low Threshold

scholarly journals Low-threshold optical gain and lasing of colloidal nanoplatelets

2014 ◽  
Author(s):  
Yusuf Kelestemur ◽  
Burak Guzelturk ◽  
Murat Olutas ◽  
Savas Delikanli ◽  
Hilmi Volkan Demir
Keyword(s):  
Optical Gain ◽  
Low Threshold

Low-threshold stimulated emission in perovskite quantum dots: single-exciton optical gain induced by surface plasmon polaritons at room temperature

2020 ◽  
Vol 8 (17) ◽  
pp. 5847-5855
Author(s):  
Litao Zhao ◽  
Yu Chen ◽  
Xiantong Yu ◽  
Xiao Xing ◽  
Jinquan Chen ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Room Temperature ◽  
Optical Gain ◽  
Stimulated Emission ◽  
Perovskite Quantum Dots ◽  
Low Threshold ◽  
Halide Perovskite ◽  
Plasmon Polaritons ◽  
Lead Halide

The surface plasmon polaritons induced single-exciton lasing of lead halide perovskite QDs in room temperature may provide a new concept for the further design of low threshold stimulated emission colloidal nanocrystal lasers.

scholarly journals Performance characteristics of GaN/Al0.2Ga0.8N quantum dot laser at L=100Å

2018 ◽  
Vol 65 (1) ◽  
pp. 38
Author(s):  
Halima Bouchenafa ◽  
Boucif Benichou ◽  
Badra Bouabdallah
Keyword(s):  
Quantum Dot ◽  
Semiconductor Lasers ◽  
Current Density ◽  
Matrix Theory ◽  
Optical Gain ◽  
Threshold Current ◽  
Threshold Current Density ◽  
Low Threshold ◽  
P Type ◽  
Density Matrix Theory

In this paper, a theoretical model is used to study the optical gain characteristics of  quantum dot lasers. The model is based on the density matrix theory of semiconductor lasers with relaxation broadening. The effect of doping with varying the side lengths of the box in the structure is taken into account. A comparative study of the gain spectra of p-doped, undoped and n-doped structures of  cubic quantum-dot (QD) laser respectively, is presented for various side lengths. The variation of peak gain on carrier density is also presented. The effect of side length on the variation in modal gain versus current density is plotted too. The results indicate that the p type doping is efficient to reach a better optical gain value, and to achieve low threshold current densities compared with undoped and  n-doped structures, and the optimum value for quantum dot width to achieve the lower threshold current density for the three cases is L=100A .   

Electrical Pumped ZnO UV Random Lasers

2007 ◽  
Vol 1035 ◽  
Author(s):  
S. Yu ◽  
Eunice Sok Ping Leong
Keyword(s):  
Light Emission ◽  
Low Cost ◽  
Laser Diodes ◽  
Optical Gain ◽  
Short Review ◽  
Stringent Requirement ◽  
Random Lasers ◽  
Electrically Pumped ◽  
The Media ◽  
Low Threshold

AbstractThe realization of ZnO random cavities may be an appropriate approach to fabricate low-cost ZnO laser diodes as there is no stringent requirement in the design of the disordered media provided that they can sustain enough optical gain and feedback within the media to achieve closed-loop random lasing. However, ZnO random lasers suffer from some drawbacks such as relatively higher threshold than conventional lasers, lack of directionality and coherency light emission as well as the difficulty to realize electrically pumped ZnO random lasers. In this paper, a short review on the possibilities to realize low threshold directional electrically pumped ZnO random laser diodes.

scholarly journals Upconversion Lasers: Stable and Low-Threshold Optical Gain in CdSe/CdS Quantum Dots: An All-Colloidal Frequency Up-Converted Laser (Adv. Mater. 17/2015)

2015 ◽  
Vol 27 (17) ◽  
pp. 2678-2678 ◽  
Author(s):  
Burak Guzelturk ◽  
Yusuf Kelestemur ◽  
Kivanc Gungor ◽  
Aydan Yeltik ◽  
Mehmet Zafer Akgul ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Gain ◽  
Cds Quantum Dots ◽  
Low Threshold

Low Threshold and Extreme High Optical Gain in ErxYbyY2-x-ySiO5 Crystalline Compound Thin Films

2018 ◽  
Author(s):  
A. Minowa ◽  
H. Isshiki ◽  
F. Kondow ◽  
K. Miyagi ◽  
G. Nakamura
Keyword(s):  
Thin Films ◽  
Optical Gain ◽  
Crystalline Compound ◽  
Low Threshold

scholarly journals Deep Blue Light Amplification from a Novel Triphenylamine Functionalized Fluorene Thin Film

Molecules ◽  
2019 ◽  
Vol 25 (1) ◽  
pp. 79 ◽  
Author(s):  
Tersilla Virgili ◽  
Marco Anni ◽  
Maria Luisa De Giorgi ◽  
Rocio Borrego Varillas ◽  
Benedetta M. Squeo ◽  
...  
Keyword(s):  
Cross Section ◽  
High Performance ◽  
Optical Gain ◽  
High Gain ◽  
Optically Pumped ◽  
Deep Blue ◽  
Light Amplification ◽  
Gain Cross Section ◽  
Low Threshold ◽  
Narrow Emission

The development of high performance optically pumped organic lasers operating in the deep blue still remains a big challenge. In this paper, we have investigated the photophysics and the optical gain characteristics of a novel fluorene oligomer functionalized by four triphenylamine (TPA) groups. By ultrafast spectroscopy we found a large gain spectral region from 420 to 500 nm with a maximum gain cross-section of 1.5 × 10−16 cm2 which makes this molecule a good candidate for photonic applications. Amplified Spontaneous Emission measurements (ASE) under 150 fs and 3 ns pump pulses have revealed a narrow emission at 450 nm with a threshold of 5.5 μJcm−2 and 21 μJcm−2 respectively. Our results evidence that this new fluorene molecule is an interesting material for photonic applications, indeed the inclusion of TPA as a lateral substituent leads to a high gain and consequently to a low threshold blue organic ASE.

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