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The JWST NIRCam dichroics enable simultaneous observations at short wavelengths (0.6–2.3 µm) and long wavelengths (2.4–5.0 µm).


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NIRCam dichroics properties

Parent page: NIRCam Instrumentation

The NIRCam dichroics split light in the optical path by reflecting short wavelengths (0.6–2.3 µm) and transmitting long wavelengths (2.4–5.0 µm). This splitting enables simultaneous observations in the short and long wavelength channels.

There is one dichroic in each module, positioned in the optical path after the coronagraphic occulting masks and before the pupil and filter wheels and detectors.

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Figure 1. NIRCam dichroic transmission

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Dichroic transmission in the short and long wavelength channels in module B (SWB and LWB, respectively). (From filters version 4.0: April 2016)




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References

JWST technical documents

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Last updated

Published December 21, 2016


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Updated April 05, 2017

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Published March 02, 2017