The frequency noise properties of commercial distributed feedback quantum cascade lasers emitting in the $4.6\mathrm{\mu m}$ range and operated in cw mode near room temperature ( $277\mathrm{K}$ ) are presented. The measured frequency noise power spectral density reveals a flicker noise dropping down to the very low level of $<100{\mathrm{Hz}}^2/\mathrm{Hz}$ at $10\mathrm{MHz}$ Fourier frequency and is globally a factor of 100 lower than data recently reported for a similar laser operated at cryogenic temperature. This makes our laser a good candidate for the realization of a mid-IR ultranarrow linewidth reference.

© 2011 Optical Society of America

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