A compact, lightweight, and efficient fiber laser lidar system has been developed to measure water vapor profiles in the lower atmosphere of Earth or Mars. The line narrowed laser consist of a Tm:germanate fiber pumped by two $792\mathrm{nm}$ diode arrays. The fiber laser transmits $\sim 0.5\mathrm{mJ}$ Q- switched pulses at $5\mathrm{Hz}$ and can be tuned to water vapor lines near $1.94\mathrm{\mu m}$ with linewidth of $\sim 20\mathrm{pm}$ . A lightweight lidar receiver telescope was constructed of carbon epoxy fiber with a $30\mathrm{cm}$ Fresnel lens and an advanced HgCdTe APD detector. This system has made preliminary atmospheric measurements.

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