We describe an etalon spectrometer with a novel light recirculation scheme to generate simultaneous parallel wavelength channels with no moving parts. We present results from a system to resolve the 1651 nm absorption feature of methane. We present results from a prototype and a corresponding model. We also show results from a solid, 3-mirror etalon that has >95% peak transmission and significantly better out-of-band rejection than its 2-mirror counterpart. We show application of this system to methane laser spectroscopy.

© 2016 Optical Society of America

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