Abstract

Frequency stabilization of mid-IR quantum cascade (QC) lasers to the kilohertz level has been accomplished by use of electronic servo techniques. With this active feedback, an 8.5µm QC distributed-feedback laser is locked to the side of a rovibrational resonance of nitrous oxide N2O at 1176.61 cm-1. A stabilized frequency-noise spectral density of 42 Hz/Hz has been measured at 100 kHz; the calculated laser linewidth is 12 kHz.

© 1999 Optical Society of America

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