Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Prasad, Saradh, Saleh AlHesseny, Hanan, AlSalhi, Mohamad S., Devaraj, Durairaj, Masilamai, Vadivel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
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
_version_ 1782511642647461888
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
work_keys_str_mv AT prasadsaradh ahighpowerfrequencytunablecolloidalquantumdotcdseznslaser
AT salehalhessenyhanan ahighpowerfrequencytunablecolloidalquantumdotcdseznslaser
AT alsalhimohamads ahighpowerfrequencytunablecolloidalquantumdotcdseznslaser
AT devarajdurairaj ahighpowerfrequencytunablecolloidalquantumdotcdseznslaser
AT masilamaivadivel ahighpowerfrequencytunablecolloidalquantumdotcdseznslaser
AT prasadsaradh highpowerfrequencytunablecolloidalquantumdotcdseznslaser
AT salehalhessenyhanan highpowerfrequencytunablecolloidalquantumdotcdseznslaser
AT alsalhimohamads highpowerfrequencytunablecolloidalquantumdotcdseznslaser
AT devarajdurairaj highpowerfrequencytunablecolloidalquantumdotcdseznslaser
AT masilamaivadivel highpowerfrequencytunablecolloidalquantumdotcdseznslaser