Cryogenic Tests of Volume-Phase Holographic Gratings: I. Results at 200 K |
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| Authors: | N Tamura G J Murray P Luke C Blackburn D J Robertson N A Dipper R M Sharples J R Allington-Smith |
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| Institution: | (1) Department of Physics, University of Durham, Durham, U.K. |
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| Abstract: | We present results from cryogenic tests of a Volume-Phase Holographic(VPH) grating at 200 K measured at near-infrared wavelengths.
The aims of these tests were to see whether the diffraction efficiency and angular dispersion of a VPH grating are significantly
different at a low temperature from those at a room temperature, and to see how many cooling and heating cycles the grating
can withstand. We have completed 5 cycles between room temperature and 200 K, and find that the performance is nearly independent
of temperature, at least over the temperature range which we are investigating. In future, we will not only try more cycles
between these temperatures but also perform measurements at a much lower temperature (e.g., ∼80 K). |
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| Keywords: | gratings near-infrared spectrographs |
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