We report on rst astronomical results with a cross-dispersed optical echelle spectrograph fed by a near single-mode ber. We also present on a novel design of a new adaptive optics (AO) optimized ber-fed cross-dispersed echelle spectrograph. The spectrograph is designed to match with AO corrected images in the optical bands provided by such as the Mt. Wilson 100 inch, Star re Optical Range 3.5 m...

We constructed an ultrahigh-throughput, high-resolution ultraviolet (UV) Raman spectrograph that utilizes a high-efficiency filter-stage monochromator and a high-dispersion Echelle spectrograph. The spectrograph utilizes a total of six mirrors and two gratings, with an overall efficiency at 229 nm of ~18%. The limiting resolution of our spectrometer is 0.6 cm⁻¹ full width half-maximum (FWHM), a...

A novel astigmatism-free spectrograph design, the Princeton Instruments SCT 320 IsoPlane Schmidt-Czerny-Turner (SCT) spectrograph, is shown to give Raman spectra with better resolution and signal-to-noise ratios than traditional Czerny-Turner (CT) spectrographs. A single-stage SCT spectrograph has been interfaced to a new low-frequency Raman spectroscopy module that uses volume phase holographi...

We describe the novel approach used for the software developed for the 2dF survey spectrograph. 2dF is a 400-ber multi-object spectrograph designed for the Anglo-Australian Telescope. One of its primary missions is a survey of 250,000 galaxy redshifts within two years, and on-line, real-time and nished product data reduction is the requirement driving the software design. To achieve these goals...

Attention is called to the long-known, but often ignored, property of a grating spectrograph to (de)magnify the slit width and length by different amounts. As an illustration, the "grating magnification" r is given as a function of grating tilt for the Ritchey-Chrétien spectrograph of the CTIO 4-meter telescope; we find that for large grating tilts the spectrograph slit can be opened to more th...

The Visible Integral-field Replicable Unit Spectrograph Prototype (VIRUS-P) has been in operation on the Harlan J Smith 2.7m Telescope at McDonald Observatory since October of 2006. The prototype was created to test the design and science capabilities of the full VIRUS instrument, wherein 150 copies of the spectrograph will be installed on the Hobby Eberly Telescope (HET). We here discuss the s...