FORS2 Grism Efficiencies
GRIS_1400V+18
This grism is based on a Volume Phased Holographic Grating400 0.10 410 0.16 425 0.27 450 0.49 475 0.71 500 0.83 525 0.87 550 0.80 575 0.67 600 0.49 625 0.32 650 0.18
GRIS_1200R
This grism is based on a Volume Phased Holographic Grating540 13.9 550 20.46 560 28.38 570 36.85 580 45.61 590 54.5 600 63.11 610 70.66 620 77.62 630 83.29 640 87.67 650 90.3 660 91.4 670 91.28 680 89.35 690 85.81 700 81.01 710 75.23 720 68.68 730 61.84 740 53.88 750 46.45 760 38.8 770 32.03 780 24.99 790 18.93 800 12.96
GRIS_1028z+29
This grism is based on a Volume Phased Holographic Gratingnm efficiency 750 0.43 775 0.59 800 0.74 825 0.84 850 0.89 874 0.89 900 0.83 925 0.72 950 0.59 975 0.44 980 0.41
GRIS_600B+22
nm efficiency 330 0.55 350 0.63 375 0.67 400 0.68 450 0.61 500 0.53 550 0.46 600 0.37 650 0.32 700 0.26
GRIS_600R+24
nm efficiency 425 0.38 450 0.43 475 0.48 500 0.50 550 0.52 600 0.49 650 0.45 700 0.42 750 0.37 800 0.34 850 0.31 900 0.27 950 0.23
GRIS_600RI+19
This grism is based on a Volume Phased Holographic Gratingnm efficiency 485 0.29 500 0.32 525 0.38 550 0.45 575 0.51 600 0.58 625 0.65 650 0.71 675 0.77 700 0.82 725 0.86 750 0.87 775 0.86 800 0.85 825 0.81 850 0.76 875 0.70 900 0.62 925 0.54 950 0.45 975 0.36 1000 0.28
GRIS_600I+25
nm efficiency 450 0.28 500 0.43 550 0.54 600 0.57 650 0.56 700 0.55 800 0.47 900 0.41 1000 0.34
GRIS_600z+23
This grism is based on a Volume Phased Holographic Gratingnm efficiency 800 0.69 825 0.76 850 0.82 875 0.86 900 0.88 925 0.88 950 0.86 975 0.84 1000 0.80
GRIS_300V+20
nm efficiency 330 0.48 350 0.62 375 0.72 400 0.78 450 0.79 500 0.74 550 0.63 600 0.55 650 0.48 700 0.42 750 0.37 800 0.33 850 0.29 900 0.25
GRIS_300I+21
nm efficiency 500 0.14 550 0.31 600 0.47 650 0.58 700 0.66 750 0.69 800 0.70 850 0.67 900 0.65 950 0.61 1000 0.57 1050 0.53 1100 0.50 1150 0.43
GRIS_200I+28
nm efficiency 550 0.10 560 0.33 580 0.56 600 0.67 650 0.75 700 0.78 750 0.77 800 0.75 900 0.67 1000 0.58 1100 0.50
GRIS_150I+27
nm efficiency 340 0.30 360 0.44 375 0.53 400 0.66 450 0.78 500 0.80 550 0.76 600 0.70 650 0.62 700 0.56 800 0.44 900 0.35 1000 0.28 1100 0.22
EGRIS_110B+98
Echelle grism4th order --------- nm efficiency 750 0.05 800 0.14 825 0.20 850 0.24 875 0.27 900 0.29 925 0.29 950 0.27 975 0.25 1000 0.21 5th order --------- nm efficiency 625 0.05 650 0.14 675 0.21 700 0.28 725 0.29 750 0.30 775 0.28 800 0.26 825 0.23 850 0.18 875 0.15 900 0.11 925 0.08 6th order --------- nm efficiency 550 0.07 575 0.16 600 0.25 625 0.27 650 0.25 675 0.22 700 0.17 725 0.14 750 0.09 775 0.07 800 0.05 7th order --------- nm efficiency 512 0.15 525 0.18 537 0.21 550 0.24 562 0.26 575 0.23 600 0.18 625 0.13 650 0.08 8th order --------- nm efficiency 450 0.09 462 0.14 475 0.21 481 0.23 488 0.26 494 0.26 500 0.26 506 0.25 512 0.23 525 0.20 550 0.11 575 0.05 9th order --------- nm efficiency 400 0.02 412 0.08 425 0.19 438 0.25 450 0.26 462 0.23 475 0.18 500 0.07 525 0.02 10th order ---------- nm efficiency 375 0.05 388 0.17 400 0.25 412 0.25 425 0.18 438 0.13 450 0.09 475 0.02 11th order ---------- nm efficiency 350 0.08 362 0.18 375 0.25 388 0.20 400 0.16 412 0.08 425 0.03 12th order ---------- nm efficiency 332 0.06 338 0.11 344 0.18 350 0.21 356 0.22 362 0.22 375 0.14 388 0.06
XGRIS_600B+92
Cross disperser grism for the echelle EGRIS_110B+98nm efficiency 325 0.25 350 0.47 375 0.58 400 0.65 450 0.66 500 0.63 550 0.56 600 0.48 700 0.35 800 0.25