We are developing a Fabry-Perot spectrometer for 3D spectroscopic observation to elucidate the physical condition of large scale starforming regions. By varying the interference conditions, images at arbitrary wavelengths can be obtained. Since the observed wavelengths are in the near-infrared, the module must be operated under vacuum and low temperature. The development items are optical element (Fabry-Perot etalon), a drive actuator and ranging system to control the etalon gap, as well as feed-back system to actively control these elements and maintain spectroscopic performance at any operate conditions. The basic performance as a spectrometer will achieve R=5,000 for finesse=50 and order=100.
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