You are in: Instruments > GMOS > Performance and Use > GMOS Components > Gratings |
GMOS Gratings |
The table lists the properties of the GMOS gratings based on laboratory measurements. The resolving power R is given at the blaze wavelength, and refers to the resolution achieved with a slit width of 0.5 arcsec.
The effective slit width of the IFU in the dispersion direction is 0.31arcsec, see the IFU page for details.
Efficiency curves based on laboratory data are available. Note that the quantum efficiency of the detectors is below 5 per cent for wavelengths longer than 1000 nm.
None of the gratings are currently used in 2nd order.
GMOS Gratings | |||||||
Grating | Grating number* [North / South] |
Ruling density [lines/mm] |
Blaze wavelength [nm] |
R | Simultaneous coverage [nm] |
nm/pixel | Efficiency data |
B1200 | G5301 | 1200 | 463 | 3744 | 143 | 0.023 | GMOS-N data |
G5321 | GMOS-S data | ||||||
R831 | G5302 | 831 | 757 | 4396 | 207 | 0.034 | GMOS-N data |
G5322 | GMOS-S data | ||||||
B600 | G5303 | 600 | 461 | 1688 | 276 | 0.045 | GMOS-N data |
G5323 | GMOS-S data | ||||||
R600 | G5304 | 600 | 926 | 3744 | 286 | 0.047 | GMOS-N data |
G5324 | GMOS-S data | ||||||
R400 | G5305 | 400 | 764 | 1918 | 416 | 0.067 | GMOS-N data |
G5325 | GMOS-S data | ||||||
R150 | G5306 | 150 | 717 | 631 | 1071 | 0.174 | GMOS-N data |
G5326 | GMOS-S data |
*The grating name is the concatenation of grating and grating number e.g. R831_G5302 for the Gemini North R831 grating.
Last update: September 5, 2003: Phil Puxley
Previous version: August 19, 2002, Inger Jørgensen