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Abdulaziz Alfahd S, Prasad Rajendra S, Al-Mujammi W, Devaraj D, Masilamani V, AlSalhi MS. An Efficient Violet Amplified Spontaneous Emission (ASE) from a Conjugated Polymer (PFO-co-pX) in Solution. Materials (Basel) 2017; 10:E265. [PMID: 28772625 DOI: 10.3390/ma10030265] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 02/18/2017] [Accepted: 02/24/2017] [Indexed: 11/17/2022]
Abstract
The optical of conjugated polymer poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(2,5-p-xylene)] also known as [(PFO-co-pX), ADS145UV], dissolved in a few solvents, has been measured. The absorption, emission spectra, and quantum yield have been investigated by using a spectrophotometer and spectrofluorometer, respectively. The properties of Amplified Spontaneous Emission (ASE) of conjugated PFO-co-pX polymer under different conditions such as solvent type, concentration, and pumping energy have been examined by using the tripled frequency of a Nd:YAG laser as a source of pumping. The relation between output energy and pumping energy for the samples with different concentrations in three solvents has been studied. In addition, efficiency and optical gain from the ASE were measured. Additionally, the stability of this polymer as a laser material was investigated. Among the host of conjugated polymer lasers obtained by optical pumping, this conjugated polymer has exhibited only one ASE band under a wide range of concentrations and pump power values. This is most likely due to the steric hindrance by the copolymer segment pX (2,5-p-xylene). This investigation has provided new insights into the excited state dynamics of conjugated polymer materials and has shown that this new conjugated polymer is quite efficient in the violet region.
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Prasad S, AlHesseny HS, AlSalhi MS, Devaraj D, Masilamai V. A High Power, Frequency Tunable Colloidal Quantum Dot (CdSe/ZnS) Laser. Nanomaterials (Basel) 2017; 7:E29. [PMID: 28336863 PMCID: PMC5333014 DOI: 10.3390/nano7020029] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 01/24/2017] [Indexed: 12/05/2022]
Abstract
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%.
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Affiliation(s)
- Saradh Prasad
- Research Chair on laser diagnosis of cancers, College of Science, King Saud University, 11451, Riyadh, Saudi Arabia.
- Department of Physics and Astronomy, College of Science, King Saud University, 11451, Riyadh, Saudi Arabia.
- Department of Electrical and Electronics, College of Engineering, Kalasalingam University, Anand Nagar, Krishnankoil, Virudhunagar 626190, Tamil Nadu, India.
| | - Hanan Saleh AlHesseny
- Research Chair on laser diagnosis of cancers, College of Science, King Saud University, 11451, Riyadh, Saudi Arabia.
| | - Mohamad S AlSalhi
- Research Chair on laser diagnosis of cancers, College of Science, King Saud University, 11451, Riyadh, Saudi Arabia.
- Department of Physics and Astronomy, College of Science, King Saud University, 11451, Riyadh, Saudi Arabia.
| | - Durairaj Devaraj
- Department of Electrical and Electronics, College of Engineering, Kalasalingam University, Anand Nagar, Krishnankoil, Virudhunagar 626190, Tamil Nadu, India.
| | - Vadivel Masilamai
- Research Chair on laser diagnosis of cancers, College of Science, King Saud University, 11451, Riyadh, Saudi Arabia.
- Department of Physics and Astronomy, College of Science, King Saud University, 11451, Riyadh, Saudi Arabia.
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