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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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A High Power, Frequency Tunable Colloidal Quantum Dot (CdSe/ZnS) Laser.

Saradh Prasad1,2,3, Hanan Saleh AlHesseny4, Mohamad S AlSalhi5,6

  • 1Research Chair on laser diagnosis of cancers, College of Science, King Saud University, 11451, Riyadh, Saudi Arabia. deva230@yahoo.com.

Nanomaterials (Basel, Switzerland)
|March 25, 2017
PubMed
Summary
This summary is machine-generated.

New tunable lasers utilizing cadmium selenide/zinc sulfide (CdSe/ZnS) quantum dots offer an efficient and cost-effective alternative. These quantum dot lasers provide tunable wavelengths for diverse scientific applications.

Keywords:
amplified spontaneous emissionbroad tunable laser from 520 to 630 nm.quantum dots CdSe/ZnSspectral properties

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Nanotechnology

Background:

  • Tunable lasers are critical for advancements in medicine, engineering, and basic science.
  • Conventional solid-state lasers are wavelength-specific, costly, and bulky.
  • Dye lasers offer tunability but suffer from poor chemical stability, necessitating new solutions.

Purpose of the Study:

  • To design and demonstrate a novel tunable laser system using various sized cadmium selenide/zinc sulfide (CdSe/ZnS) quantum dots.
  • To investigate the amplified spontaneous emission (ASE) and lasing properties of quantum dot solutions.
  • To assess the potential of quantum dots as an efficient and tunable gain medium.

Main Methods:

  • CdSe/ZnS quantum dots of different sizes were synthesized and dispersed in tetrahydrofuran.
  • Optical pumping was performed using the second (532 nm) and/or third (355 nm) harmonics of an Nd:YAG laser.
  • Amplified spontaneous emission (ASE) was characterized, and a laser resonator cavity was constructed using the quantum dot solution.

Main Results:

  • Broadband fluorescent emission was observed from 520 nm to 630 nm.
  • Optimized optical pumping yielded ASE with a 4-7 nm full width at half-maximum (FWHM) and a directional beam (7 mrad divergence).
  • The quantum dot laser demonstrated tunability from 510 nm to 630 nm with a spectral width of 1 nm and a conversion efficiency of approximately 0.1%.

Conclusions:

  • CdSe/ZnS quantum dots serve as an effective gain medium for tunable laser applications.
  • This quantum dot-based laser offers a promising, potentially more cost-effective and stable alternative to conventional tunable lasers.
  • Further optimization could enhance the conversion efficiency and broaden the applicability of these quantum dot lasers.