We have demonstrated sensing of formaldehyde (${\mathrm{H}}_2\mathrm{CO}$) using a room-temperature distributed feedback interband cascade laser (ICL) emitting around 3493 nm. The ICL has been characterized and proved to be very suitable for tunable laser spectroscopy (TLS). The ${\mathrm{H}}_2\mathrm{CO}$ TLS spectra were recorded in direct absorption mode and showed excellent agreement with the Pacific Northwest National Laboratory database. The measurements reported here were taken from a series of measurements of a mixture of ${\mathrm{H}}_2\mathrm{CO}$ in air obtained by vaporizing a solution also containing methanol and formic acid. We obtained a resolution limit better than $1\mathrm{ppm}\times \mathrm{m}$ assuming a relative absorption of ${10}^{-3}$.

© 2012 Optical Society of America

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