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

H. Cheng, A. E. Mironov, J. H. Ni, H. J. Yang, W. W. Chen, Z. Dai, P. D. Dragic, J. Dong, S. J. Park, J. G. Eden

Research output: Contribution to journalArticle

Abstract

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-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 × 10-7 cm3. 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.

Original languageEnglish (US)
Article number081106
JournalApplied Physics Letters
Volume106
Issue number8
DOIs
StatePublished - Feb 23 2015

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Coupling quantum dots to optical fiber: Low pump threshold laser in the red with a near top hat beam profile'. Together they form a unique fingerprint.

  • Cite this