Tunable multi-wavelength quantum dot external-cavity lasers

Chen Hung Pai, Kuo-Jui Lin*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations


The chirped multilayer quantum-dot (QD) gain media are arranged in Fourier-transform external-cavity laser (FT-ECL) configuration. Novel slit designs select 2, 3, and 4 different wavelengths that are diffracted from the grating for optical feedback. Therefore, the dual-, triple- and quadruple-wavelength ECLs are demonstrated in this study. The resulted multi-wavelength lasing emissions are achieved under injected current of 100 mA (or 1.33 kA/cm2) with signal to amplified spontaneous emission (ASE) ratio over 20 dB. Around peak-gain wavelength of 12xx-nm range, the adjacent wavelength separation is over 50 nm for dual-wavelength lasing, up to 13 nm for triple-wavelength lasing, and about 4-5 nm for quadruple-wavelength lasing emissions. To further extend the wavelength separation for dual-wavelength lasing emissions, another modified scheme with two separate external mirrors are adopted and the achieved maximum value is about 126 nm in wavelength separation or over 25 THz in frequency difference. The terahertz (THz) generation by photomixing of dual-wavelength ECLs is also discussed in this study.

Original languageEnglish
Title of host publicationNonlinear Optics and Applications VII
StatePublished - 8 May 2013
EventNonlinear Optics and Applications VII - Prague, Czech Republic
Duration: 15 Apr 201317 Apr 2013

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceNonlinear Optics and Applications VII
Country/TerritoryCzech Republic


  • External-cavity lasers
  • Quantum-dot lasers
  • Semiconductor lasers
  • Tunable lasers


Dive into the research topics of 'Tunable multi-wavelength quantum dot external-cavity lasers'. Together they form a unique fingerprint.

Cite this