Feasibility study of beam-expanding telescopes in the interferometer arms for the Einstein Telescope
The optical design of the Einstein Telescope (ET) is based on a dual-recycled Michelson interferometer with Fabry-Perot cavities in the arms. ET will be constructed in a new infrastructure, allowing us to consider different technical implementations beyond the constraints of the current facilities. In this paper we investigate the feasibility of using beam-expander telescopes in the interferometer arms. We provide an example implementation that matches the optical layout as presented in the ET design update 2020. We further show that the beam-expander telescopes can be tuned to compensate for mode mismatches between the arm cavities and the rest of the interferometer.
Physical Review D
- Pub Date:
- January 2021
- Astrophysics - Instrumentation and Methods for Astrophysics
- 9 pages with 11 figures. To be published in: PRD