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NICI Filters

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NICI has one filter wheel in each science channel. The current filter complement is listed below, with the location of each filter indicated by the Gemini ID numbers in the "Channel 1" and "Channel 2" columns. Click on an ID number to see the transmission curve for the actual filter element in that channel, if available.

The 1% 1.6 µm filters are used with the H-band 50/50 beamsplitter for Simultaneous Spectral Differential Imaging (SSDI) in the methane bandhead. These filters were built to high precision specifications for optimal image quality. They are mounted in both filter wheels so they can be interchanged to help cancel non-common-path errors between the two science channels.

The remaining filters are from the same batch as the NIRI filters.


NICI Filters
Filter Name Central Wavelength Wavelength range or Width Channel 1
(Red)
Gemini ID 		Channel 2
(Blue)
Gemini ID
Block -- -- -- --
CH4 H 1% S
 1.587 0.0150 (0.94%) G0724 G0722
CH4 H 1% Sp 1.603 0.0162 (1.01%) G0728 G0726
CH4 H 1% L 1.628 0.0174 (1.07%) G0720 G0732
CH4 H 1% L_2 1.628 0.0174 (1.07%) G0735
CH4 H 4% S 1.578 0.062 (4.00%) G0742 G0743
CH4 H 4% L 1.652 0.066 (3.95%) G0740 G0737
J
1.25 1.15-1.33   G0702
H 1.65 1.49-1.78   G0703
K 2.20 2.03-2.36 G0704  
Ks 2.15 1.99-2.30 G0705  
Kprime 2.12 1.95-2.30 G0706  
Lprime 3.78 3.43-4.13 G0707  
Mprime 4.68 4.55-4.79 G0708  
[Fe II] 1.644 1.5%   G0712
H2 1-0 S(1) 2.1239 1.23% G0709 
Br-gamma 2.1686 1.36% G0711
Kcont 2.2718 1.55% G0710  
CH4 H 6.5% S 1.596 0.1175 (7.3%)     G0713
CH4 H 6.5% L 1.701 0.0972 (5.7%) G0714

Created 15 July 2005, B. Rodgers and T. Hayward

Modified 26 October 2007, E. Christensen