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Title: Coupling quantum dots to optical fiber: Low pump threshold laser in the red with a near top hat beam profile

Direct coupling of the optical field in a ∼244 nm thick, CdSe/ZnS quantum dot film to an optical fiber has yielded lasing in the red (λ ∼ 644 nm) with a threshold pump energy density < 2.6 mJ cm{sup −2}. Comprising 28–31 layers of ∼8 nm diameter quantum dots deposited onto the exterior surface of a 125 μm diameter coreless silica fiber, this free-running oscillator produces 134 nJ in 3.6 ns FWHM pulses which correspond to 37 W of peak power from an estimated gain volume of ∼4.5 × 10{sup −7} cm{sup 3}. Lasing was confirmed by narrowing of the output optical radiation in both the spectral and temporal domains, and the laser beam intensity profile approximates a top hat.
Authors:
 [1] ;  [2] ; ; ; ; ; ; ;  [3] ;  [4] ;  [1]
  1. Department of Electronic Engineering, Xiamen University, Xiamen 361005 (China)
  2. (United States)
  3. Laboratory for Optical Physics and Engineering, Department of Electrical and Computer Engineering, University of Illinois, Urbana, Illinois 61801 (United States)
  4. Department of Electrical and Computer Engineering, University of Illinois, Urbana, Illinois 61801 (United States)
Publication Date:
OSTI Identifier:
22412676
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; APPROXIMATIONS; BEAM PROFILES; CADMIUM SELENIDES; COUPLING; ENERGY DENSITY; FILMS; GAIN; LASER RADIATION; LAYERS; OPTICAL FIBERS; OSCILLATORS; QUANTUM DOTS; SILICA; SURFACES; ZINC SULFIDES