However, our discussions with a leading manufacturer of infrared interference filters revealed that in this wavelength region, due to the available production, monitoring, and metrology techniques, the filter width is currently limited to about 0.4% full width at half maximum (FWHM) of the center wavenumber. Covering a wavenumber region of approximately two times the FWHM of the filter is necessary to avoid signal aliasing while using only one sideband. Therefore, an SHS spectrometer with a resolving power of 150,000, would require an FPA of about 2400 elements (). Even though midinfrared FPAs with are beginning to enter the commercial market, we did not pursue this option in an effort to minimize technical risk. Instead, we explored whether a certain amount of sideband folding and aliasing is acceptable without contaminating the narrow wavelength region of interest, which will enable the selection of an FPA with 1024 pixels in one-dimension.