Abstract
We report line width measurements of a quantum cascade distributed feedback laser by a heterodyne experiment. At currents slightly above threshold and a laser output power higher than 1 mW, the full width at half maximum of the beat signal was narrower than 0.5 MHz, which gives us an upper limit of the laser line width. As reference laser we used a carbon monoxide laser. Both lasers were operating unstabilized in continuous wave mode emitting light at about 5.2 μm.
Original language | English (US) |
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Pages (from-to) | 127-130 |
Number of pages | 4 |
Journal | Optics Communications |
Volume | 197 |
Issue number | 1-3 |
DOIs | |
State | Published - Sep 15 2001 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering
Keywords
- Beat note
- Line width
- Mid infrared
- Quantum cascade laser
- Spectroscopy