Refine
Year
- 2014 (60) (remove)
Publication Type
- Article (25)
- Part of a Book (18)
- Conference Proceeding (7)
- Lecture (6)
- Contribution to a Periodical (2)
- Participation in a Norm (DIN, RFC etc.) (2)
Language
- English (44)
- German (13)
- Multiple languages (3)
Keywords
- adaptive optics (1)
- deformable mirror (1)
- laser crystal (1)
- praseodymium (1)
- refractive index change (1)
- space optics (1)
- thermal expansion coefficient (1)
- unimorph (1)
- yttrium lithium fluoride (1)
Faculty
- Physikingenieurwesen (PHY) (60) (remove)
Concepts for future large space telescopes require an active optics system to mitigate aberrations caused by thermal deformation and gravitational release. Such a system would allow on-site correction of wave-front errors and ease the requirements for thermal and gravitational stability of the optical train. In the course of the ESA project "Development of Adaptive Deformable Mirrors for Space Instruments" we have developed a unimorph deformable mirror designed to correct for low-order aberrations and dedicated to be used in space environment. We briefly report on design and manufacturing of the deformable mirror and present results from performance verifications and environmental testing.
We report interferometric measurements of the temperature coefficient of the refractive index (dn=dT) and the coefficient of thermal expansion (a) of a praseodymium-doped yttrium lithium fluoride (Pr:YLF) crystal and of a fused silica reference sample. Our phase-resolved interferometric method yields a large number of data points and thus allows a precise measurement and a good error estimation. Furthermore, both dn=dT and a are obtained simultaneously from a single measurement which reduces errors that can occur in separate measurements. Over the temperature range from 20 °C to 80 °C, the value of dn=dT of Pr:YLF decreases from -5.2 x 10-6 /K to -6.2 x 10-6 /K for the ordinary refractive index and from -7.6 x 10-6 /K to -8.6 x 10-6 /K for the extraordinary refractive index. The coefficient of thermal expansion for the a-axis of Pr:YLF increases from 16.4 x 10-6 /K to 17.8 x 10-6 /K over the same temperature range.
Medizintechnik
(2014)