Abstract

The multiechelle grating arrangement spectrometer aims for a wide spectral range with maximum resolution (>2 M) in a relatively compact instrument. Dispersion is based on a set of four fixed echelle gratings. The short free spectral range characteristic of high orders (>75) allows use of pressure scanning instead of tenth second of arc mechanical motions. Instrument capabilities depend on the echelle, in particular, its ruled width, on high blaze angle, large groove spacing, high efficiency, and precise match of four replicas. To improve on the first models, a new master echelle had to be ruled.

© 1988 Optical Society of America