Physics – Optics
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.7405k&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #74.05; Bulletin of the American Astronomical Society, Vol. 27, p.1390
Physics
Optics
Scientific paper
We have fabricated an immersion echelle grating using silicon micromachining (chemical etching) techniques (Graf et al. 1993, Applied Optics, Vol. 33, No. 1, p. 96). The grating consists of a pattern of V-shaped grooves (25mu m spacing, 70 degree opening angle, blazed at 55 degrees) etched onto one facet of a mono-crystaline silicon prism. By diffracting an IR beam inside the prism we obtain a factor of 3.47 (the refractive index of Si at 2mu m) increase in resolving power over a front surface reflection grating of the same length. This technique has the advantage that the grating can obtain equivalent spectral resolution to a front surface grating 3.47 times its size, making the immersion grating ideal for cryogenic and/or space-based platforms where spectrometer size must be minimized. We present laboratory test results which evaluate the efficiency and pattern accuracy of our immersion echelle; first as a front surface reflection grating from lambda = 0.5mu m to 2.5mu m, and then in immersion at lambda = 1.5mu m to 2.5mu m. Finally, we offer some conclusions and suggestions regarding the utility of such gratings in astronomical spectrometers. This work was supported by the David and Lucile Packard Foundation and by NASA Grant NAGW-4027.
Benedict Tom
Jaffe Daniel T.
Keller Luke D.
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