An echelle spectrograph has been constructed for astronomical use at mid-infrared wavelengths. It contains a liquid-helium-cooled echelle grating and a 10 × 64 pixel Si:As impurity band detector array. The array is used to measure a 64-point spectrum with 1000-25,000 resolving power at each of ten points spaced by 0".4-3" along a slit. The spectrograph can be used at wavelengths between about 4 and 25 μm. The instrument has proven to be photon-noise limited with an overall quantum efficiency ranging from ≈ 0.02 at 4 μm wavelength to 0.2 near 20 μm.
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Achtermann et al. (1989) studied this question.
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