Abstract
We demonstrate a new design hollow optical fiber suitable for use on IR heterodyne spectroscopy in mid-infrared wavelength region. The spectral feature of the laser emission line and the system noise temperature obtained by heterodyne detection with hollow optical fiber is confirmed by a laboratory measurement. The system noise temperature less than 3000 K obtained by the experimental setup with the CO<sub>2</sub> laser-based heterodyne system led by a hollow optical fiber is only ~100 % above the quantum limit. The hollow optical fiber allows heterodyne detection with a sufficient efficiency. This permits simplified fabrication, provides even more weight reduction. Further investigation is required for use of hollow optical fiber on the target source.
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