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

Journal Article · Mon Feb 23 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4913698· OSTI ID:22412676

Mironov, A. E.; Ni, J. H.; Yang, H. J.; Chen, W. W.; Dai, Z.; Park, S. -J.; Dragic, P. D. ^[1]; Dong, J. ^[2]

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1. Department of Electrical and Computer Engineering, University of Illinois, Urbana, Illinois 61801 (United States)
2. Department of Electronic Engineering, Xiamen University, Xiamen 361005 (China)

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.

• OSTI ID: 22412676
• Journal Information: Applied Physics Letters, Vol. 106, Issue 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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