title: Cryogenic tests of volume-phase holographic gratings: results at 100 K.
abstract: We present results from cryogenic tests of volume-phase holographic (VPH) gratings at approximately 100 K. The aims of these tests are to see whether the diffraction efficiency as a function of wavelength is significantly different at a low temperature from that at room temperature and to see how the performance of a VPH grating is affected by a number of thermal cycles. We have completed ten cycles between room temperature and 100 K and find no clear evidence that the diffraction efficiency changes with temperature or with a successive thermal cycle.
authors.affiliation: Centre for Advanced Instrumentation, Department of Physics, University of Durham, UK. naoyuki@naoj.org
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Tamura
authors.forename: Graham J
authors.initials: GJ
authors.lastname: Murray
authors.forename: Peter
authors.initials: P
authors.lastname: Luke
authors.forename: Colin
authors.initials: C
authors.lastname: Blackburn
authors.forename: David J
authors.initials: DJ
authors.lastname: Robertson
authors.forename: Nigel A
authors.initials: NA
authors.lastname: Dipper
authors.forename: Ray M
authors.initials: RM
authors.lastname: Sharples
authors.forename: Jeremy R
authors.initials: JR
authors.lastname: Allington-Smith