Abstract
An external-cavity (EC) quantum cascade (QC) laser using optical feedback from a partial-reflector is reported. With this configuration, the otherwise multi-mode emission of a Fabry-Perot QC laser was made single-mode with optical output powers exceeding 40 mW. A mode-hop free tuning range of 2.46 cm -1 was achieved by synchronously tuning the EC length and QC laser current. The linewidth of the partial-reflector EC-QC laser was measured for integration times from 100 μs to 4 seconds, and compared to a distributed feedback QC laser. Linewidths as small as 480 kHz were recorded for the EC-QC laser.
Original language | English (US) |
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Pages (from-to) | 26037-26045 |
Number of pages | 9 |
Journal | Optics Express |
Volume | 18 |
Issue number | 25 |
DOIs | |
State | Published - Dec 6 2010 |
Externally published | Yes |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics