We have demonstrated sensing of formaldehyde () 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 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 in air obtained by vaporizing a solution also containing methanol and formic acid. We obtained a resolution limit better than assuming a relative absorption of .
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