The following filters are currently available in LWS. See below for plots of filter transmission curves compared to the atmospheric transmission measured for Mauna Kea.

Name	Bandpass¹ [µm]	Bandpass 2 Data
L	3.5-4.2	N/A	N/A
M	4.4-5.0	N/A	N/A
8.0	7.81-8.94	plot	table
8.9	8.39-9.27	plot	table
9.9	9.67-10.42	plot	table
10.7	9.92-11.47	plot	table
SiC	10.64-12.96	plot	table
11.7	11.15-12.25	plot	table
12.5	12.01-13.25	plot	table
17.65	17.31-18.16	plot	table
18.75	18.31-19.20	plot	table
23.1	22.74 - 23.47	plot	table
24.5	24.16 - 24.90	plot	table
Nwide3	7.73-13.31	plot	table
Spec 10	>7.52 µm (long pass)	plot	table
Spec 20	>13.93 µm (long pass)	plot	table

Notes:

1. Wavelength range over which filter transmission exceeds 50% of peak.
2. The transmission data and wavelength calibration are in agreement with manufacture's data.
3. Nwide cannot be used for imaging. The 5 micron bandwidth results in excessive background levels and saturates the detector. The SiC filter is better suited for broad band imaging with LWS. Nwide is used as a blocking filter for spectroscopy.

Filter transmission over the 10 and 20 micron atmospheric windows.

The atmospheric trasmission spectra are calculated by Lord, S. 1992, NASA Tech. Mem. 103957. The filter transmission curves are taken from the table above.

---

Go to: LWS Home Page - Instruments Home Page - Keck Home Page

---