Coupling quantum dots to optical fiber: Low pump threshold laser in the red with a near top hat beam profile
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 23, 2015
- Source ID
- 10.1063/1.4913698
Entities
People
- A E Mironov
- H J Yang
- Hei Victor Cheng
- J. H. Ni
- James Gary Eden
- Jiaqi Dong
- Peter D. Dragic
- S.-j. Park
- W. W. Chen
- Z. Dai
Organizations
- Air Force Office of Scientific Research
- China Scholarship Council
- University of Illinois Urbana–Champaign
- Xiamen University