WIYN Observatory

BENCH SPECTROGRAPH

The Bench Spectrograph is a stable, isolated spectrograph optimized for use with optical fibers. It permits relatively easy changes of configuration between high and low dispersion and between various spectral regions. Hydra, SparsePak, HexPak and GradPak all feed into the Bench Spectrograph.

More information on the Bench Spectrograph and the CCD can be found in the Hydra Manual.

Available Bench Gratings and Sample Bench Configurations

Grating1 Central λ (Å)2 Order λ Coverage (Å)3
BSC		 Spectral Resolution (Å)4
Red Cable5 Blue Cable6
316 @ 7.0 7500 1 5290 5.72 8.87
316 @ 7.0 3750 2 2645 2.86 4.44
400 @ 4.2 5000 1 41997 4.56 7.07
600 @ 10.1 5500 1 2763 3.35 4.60
600 @ 13.9 7500 1 2724 2.86 4.43
600 @ 13.9 3800 2 1362 1.43 2.22
860 @ 30.9 10800 1 1680 1.64 2.54
860 @ 30.9 6000 2 840 0.77 1.19
860 @ 30.9 4000 3 560 0.52 0.80
1200 @ 28.7 7500 1 1231 1.19 1.84
1200 @ 28.7 4000 2 615 0.58 0.90
316 @ 63.4 6563 9 250 0.23 0.36
316 @ 63.4 3890 14 215 0.19 0.30
740 VPH 8798 1 2152 2.68 3.94
740 VPH 5000 2 1076 1.34 1.97
3300 VPH 5120 1 273 0.31 0.46


1Grooves/mm @ Littrow blaze angle.
2Approximate wavelength of blaze peak.
3Bench Spectrograph Camera. For Simmons camera, divide by 1.34.
4For typical projected fiber image size (2 x 2 binning), Bench Camera.
5Transmission of the red fibers drops off rapidly blueward of 4000(Å).
6Transmission of the blue fibers drops off non-uniformly redward of 8500(Å).
7Not recommended due to difficulty focusing over the wavelength range.

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Last modified: 11-Jul-2022 13:14:59 MST