Single mode emitting ridge waveguide quantum cascade lasers coupled to an active ring resonator filter

Julia Semmel*, Wolfgang Kaiser, Holger Hofmann, Sven Höfling, Alfred Forchel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Quantum cascade ridge waveguide lasers with coupled ring resonators have been fabricated. Coupling of an actively pumped microring resonator to a ridge waveguide device allows for filtering the numerous Fabry-Perot modes emerging in the ridge waveguide. Due to the large free spectral range of the ring resonators mode selection is accomplished, resulting in stable single mode emission for an optimized design. Thus, side mode suppression ratios of up to 26 dB over a temperature range of 140 K are attained by on-chip coupling of a ridge waveguide device with a microsquare ring resonator. The tuning rate of the microring resonator laser is 0.40 nm/K. Output powers of several milliwatts are obtained.

Original languageEnglish
Article number211106
Number of pages3
JournalApplied Physics Letters
Volume93
Issue number21
DOIs
Publication statusPublished - 24 Nov 2008

Keywords

  • Fabry-Perot resonators
  • laser tuning
  • microcavity lasers
  • optical pumping
  • quantum cascade lasers
  • ridge waveguides
  • waveguide lasers
  • DISTRIBUTED-FEEDBACK
  • HIGH-POWER
  • TEMPERATURE
  • OPERATION

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