Mid-infrared (λ≈7.4 μm) quantum cascade laser amplifier for high power single-mode emission and improved beam quality

Mariano Troccoli, Claire Gmachl, Federico Capasso, Deborah L. Sivco, Alfred Y. Cho

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

A quantum cascade laser amplifier has been developed. It was used to obtain high power single-mode emission at λ≈7.4μm from a quantum cascade distributed feedback laser, together with enhanced beam quality. Laser and amplifier are directly coupled in a master oscillator power amplifier configuration. Peak optical powers of 0.5 W at 80 K have been obtained. Ninety percent of the total power is thereby emitted within a divergence of 20° in the lateral direction. The device showed single mode operation with a side mode suppression ratio of 30 dB in the temperature range from 10 to 280 K. This allowed tuning of the emission wavelength in the range from 7.36 to 7.46 μm. The estimated peak amplifier gain is 6.4 and 4.9 dB at 80 and 300 K, respectively, and the cavity losses are 12.5 and 22 cm-1 at the corresponding temperatures.

Original languageEnglish (US)
Pages (from-to)4103-4105
Number of pages3
JournalApplied Physics Letters
Volume80
Issue number22
DOIs
StatePublished - Jun 3 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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