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A High Power, Frequency Tunable Colloidal Quantum Dot (CdSe/ZnS) Laser
Tunable lasers are essential for medical, engineering and basic science research studies. Most conventional solid-state lasers are capable of producing a few million laser shots, but limited to specific wavelengths, which are bulky and very expensive. Dye lasers are continuously tunable, but exhibit...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5333014/ https://www.ncbi.nlm.nih.gov/pubmed/28336863 http://dx.doi.org/10.3390/nano7020029 |
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author | Prasad, Saradh Saleh AlHesseny, Hanan AlSalhi, Mohamad S. Devaraj, Durairaj Masilamai, Vadivel |
author_facet | Prasad, Saradh Saleh AlHesseny, Hanan AlSalhi, Mohamad S. Devaraj, Durairaj Masilamai, Vadivel |
author_sort | Prasad, Saradh |
collection | PubMed |
description | Tunable lasers are essential for medical, engineering and basic science research studies. Most conventional solid-state lasers are capable of producing a few million laser shots, but limited to specific wavelengths, which are bulky and very expensive. Dye lasers are continuously tunable, but exhibit very poor chemical stability. As new tunable, efficient lasers are always in demand, one such laser is designed with various sized CdSe/ZnS quantum dots. They were used as a colloid in tetrahydrofuran to produce a fluorescent broadband emission from 520 nm to 630 nm. The second (532 nm) and/or third harmonic (355 nm) of the Nd:YAG laser (10 ns, 10 Hz) were used together as the pump source. In this study, different sized quantum dots were independently optically pumped to produce amplified spontaneous emission (ASE) with 4 nm to 7 nm of full width at half-maximum (FWHM), when the pump power and focusing were carefully optimized. The beam was directional with a 7 mrad divergence. Subsequently, these quantum dots were combined together, and the solution was placed in a resonator cavity to obtain a laser with a spectral width of 1 nm and tunable from 510 to 630 nm, with a conversion efficiency of about 0.1%. |
format | Online Article Text |
id | pubmed-5333014 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-53330142017-03-21 A High Power, Frequency Tunable Colloidal Quantum Dot (CdSe/ZnS) Laser Prasad, Saradh Saleh AlHesseny, Hanan AlSalhi, Mohamad S. Devaraj, Durairaj Masilamai, Vadivel Nanomaterials (Basel) Article Tunable lasers are essential for medical, engineering and basic science research studies. Most conventional solid-state lasers are capable of producing a few million laser shots, but limited to specific wavelengths, which are bulky and very expensive. Dye lasers are continuously tunable, but exhibit very poor chemical stability. As new tunable, efficient lasers are always in demand, one such laser is designed with various sized CdSe/ZnS quantum dots. They were used as a colloid in tetrahydrofuran to produce a fluorescent broadband emission from 520 nm to 630 nm. The second (532 nm) and/or third harmonic (355 nm) of the Nd:YAG laser (10 ns, 10 Hz) were used together as the pump source. In this study, different sized quantum dots were independently optically pumped to produce amplified spontaneous emission (ASE) with 4 nm to 7 nm of full width at half-maximum (FWHM), when the pump power and focusing were carefully optimized. The beam was directional with a 7 mrad divergence. Subsequently, these quantum dots were combined together, and the solution was placed in a resonator cavity to obtain a laser with a spectral width of 1 nm and tunable from 510 to 630 nm, with a conversion efficiency of about 0.1%. MDPI 2017-01-30 /pmc/articles/PMC5333014/ /pubmed/28336863 http://dx.doi.org/10.3390/nano7020029 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Prasad, Saradh Saleh AlHesseny, Hanan AlSalhi, Mohamad S. Devaraj, Durairaj Masilamai, Vadivel A High Power, Frequency Tunable Colloidal Quantum Dot (CdSe/ZnS) Laser |
title | A High Power, Frequency Tunable Colloidal Quantum Dot (CdSe/ZnS) Laser |
title_full | A High Power, Frequency Tunable Colloidal Quantum Dot (CdSe/ZnS) Laser |
title_fullStr | A High Power, Frequency Tunable Colloidal Quantum Dot (CdSe/ZnS) Laser |
title_full_unstemmed | A High Power, Frequency Tunable Colloidal Quantum Dot (CdSe/ZnS) Laser |
title_short | A High Power, Frequency Tunable Colloidal Quantum Dot (CdSe/ZnS) Laser |
title_sort | high power, frequency tunable colloidal quantum dot (cdse/zns) laser |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5333014/ https://www.ncbi.nlm.nih.gov/pubmed/28336863 http://dx.doi.org/10.3390/nano7020029 |
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