ar X iv : a st ro - p h / 06 09 06 9 v 1 4 Se p 20 06 Cryogenic tests of volume - phase holographic gratings : results at 100 K
نویسندگان
چکیده
We present results from cryogenic tests of Volume-Phase Holographic (VPH) gratings at ∼ 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 10 cycles between room temperature and 100 K, and find no clear evidence that the diffraction efficiency changes with temperature or with successive thermal cycle.
منابع مشابه
ar X iv : a st ro - p h / 06 09 71 1 v 1 2 6 Se p 20 06 BAIKAL Experiment : main results obtained with the neutrino telescope NT 200
The Baikal Neutrino Telescope NT200 takes data since April 1998. On April 9th, 2005, the 10 Mton scale detector NT200+ was put into operation in Lake Baikal. Selected results obtained during 1998-2002 with the neutrino telescope NT200 are presented.
متن کاملar X iv : a st ro - p h / 06 09 57 0 v 1 2 0 Se p 20 06 The Dark Side and its Nature
Although the cosmic concordance cosmology is quite successfull in fitting data, fine tuning and coincidence problems apparently weaken it. We review several possibilities to ease its problems, by considering various kinds of dynamical Dark Energy and possibly its coupling to Dark Matter, trying to set observational limits on Dark Energy state equation and coupling.
متن کاملar X iv : a st ro - p h / 06 09 69 9 v 1 2 6 Se p 20 06 Dynamical vacuum energy , holographic quintom , and the reconstruction of scalar - field dark energy Xin
When taking the holographic principle into account, the vacuum energy will acquire dynamical property that its equation of state is evolving. The current available observational data imply that the holographic vacuum energy behaves as quintom-type dark energy. We adopt the viewpoint of that the scalar field models of dark energy are effective theories of an underlying theory of dark energy. If ...
متن کاملar X iv : a st ro - p h / 06 09 52 4 v 1 1 9 Se p 20 06 Astronomy meets QCD : cooling constraints for the theories of internal structure of compact objects
We discuss a set of tests which confront observations of cooling compact objects and theories of their thermal evolution. As an example we apply the recently developed LogNLog S test of compact star cooling theories to hybrid stars with a color superconducting quark matter core, we also apply and discuss other existing tests. While there is not yet a microscopically founded superconducting quar...
متن کامل