Abstract

An echelle spectrograph featuring broad wavelength coverage and resolution optimized for a diffuse interstellar band carrier search using synchrotron radiation is described. Nearly uniform separation of multiple echelle orders is achieved using an external cross-dispersion spectrometer incorporating both a prism and a grating. Performance and benchmark data are presented.

© 2008 Optical Society of America

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Figures (5)

Fig. 1
Fig. 1

Separation of adjacent echelle orders spanning the region of interest.

Fig. 2
Fig. 2

Optical layout of custom 0.25 m cross-dispersion spectrometer. See text for labels.

Fig. 3
Fig. 3

Double-exposed CCD output frame of synchrotron radiation continuum (slanted lines) and hollow cathode wavelength reference lamp (dots) from the echelle spectrograph.

Fig. 4
Fig. 4

Yb-Ne hollow cathode lamp spectrum recorded using the echelle spectrograph.

Fig. 5
Fig. 5

Comparison of the measured O 2 band (solid line) and simulation (squares). Only 12 nm of a spectrum covering > 200 nm is shown. Data were acquired in 2   s of integration.

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