LRIS Modes and Instrument Properties
Modes
LRIS has two separate cameras, a blue side and a red side. These cameras can be operated simultaneously, though both must be operated using the same basic mode:
- Optical imaging
- Low-dispersion spectroscopy (R=300-5000)
Table 1 provides a summary of these modes, options, and features of LRIS.
| Spectroscopy or Imaging | Mode | Slits/FOV |
|---|---|---|
| Low Resolution Spectroscopy | long slit | 0.7", 1.0", 1.5". 8.7" widths, all 3' long |
| multi-slit | 4'x8' field, up to 30-40 objects, 0.7"-1.4" slits milled on-site | |
| polarimetry | 1.0" and 1.5" | |
| Optical Imaging | imaging | 6'x8' FOV |
| polarimetry | 25"x25" FOV |
Instrument Properties
LRIS employs a selection of fixed slit widths that are set before the dichroic. Table 2 gives a summary of LRIS's properties and design parameters. For more details, see LRIS Instrument and Data Format
| Property | Blue Side | Red Side |
|---|---|---|
| Wavelength Range | 0.3 - 1.0 microns | 0.3 - 1.0 microns |
| Pixel scale | 0.135"/pix | 0.135"/pix |
| Dichroics (numbers are 50% transmission/reflectance wavelength in nm) | D460, D500, D560, D680 | |
| Dispersion [A/mm] | 0.24-1.43 | 0.4-3.0 |
| Slit Widths | 0.7", 1.0", 1.5", 8.7" (longslit), 1.0" & 1.5" (polarimetry) | |
| Slit Lengths | 175" (longslit), 25" (polarimetry) | |
| Grisms (blue) and Gratings (red) [lines/mm@blaze wavelength (A)] | 300@5000, 400@3400, 600@4000, 1200@3400 | 150@7500, 300@5000, 400@8500, 600@5000, 600@7500, 600@10000, 831@8200, 900@5500, 1200@7500, 1200&9000 |
| Filters | broad-band: u', B, g, V; narrow-band (private): NB4170, NB3425, NB3640, NB4970, NB4670, NB4430, NB4535, NB4040, NB4110 | broad-band: B, V, R, Rs, I; long-pass: GG495, OG570, RG850; narrow-band (private): NB4000, NB5390, NB6741, NB8185, NB8560, NB9135, NB9148 |
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