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The optical design of the Einstein Telescope (ET) is based on a dual-recycledMichelson interferometer with Fabry-Perot cavities in the arms. ET will beconstructed in a new infrastructure, allowing us to consider differenttechnical implementations beyond the constraints of the current facilities. Inthis paper we investigate the feasibility of using beam-expander telescopes inthe interferometer arms. We provide an example implementation that matches theoptical layout as presented in the ET design update 2020. We further show thatthe beam-expander telescopes can be tuned to compensate for mode mismatchesbetween the arm cavities and the rest of the interferometer.

Feasibility study of beam-expanding telescopes in the interferometer arms for the Einstein Telescope