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NICS - OCLI filters

The K, K', H and Js filters were manufactured by OCLI for the consortium of astronomers headed by Alan Tokunaga. They are mounted inside NICS tilted by about 5 degrees. Their transmission was measured directly inside the instrument by taking a series of spectra of a halogen lamp without and with the filter inserted before the AMICI, IJ, JH, JK' and HK dispersers. No significant (>10-4) out-of-band leak was found within the 0.8-2.6 µm wavelength range.
The resulting transmission curves, measured at a temperature of about 78 K, are available in the following ASCII files.


For any comments please contact Vania Lorenzi.