Design and alignment of a reflective mode matching telescope for squeezing experiments

Mode mismatch in laser optics and optical cavities significantly limits the efficiency of squeezing systems. To overcome this limitation, we developed an off-axis mode-matching telescope (MMT) based on spherical mirrors, specifically designed to suppress astigmatism and back-reflection while providing the required magnification. The optomechanical layout features a baseplate with reference trenches and modular adapters, enabling semi-kinematic mounting and reproducible alignment. Misalignment compensation was guided by combined beam-profiling measurements and simulations. The implemented system achieved beam parameters consistent with the design specifications, with simulated cavity coupling efficiency exceeding 98.5% based on the measured output beam parameters. This approach offers a systematic strategy for the design and alignment of reproducible MMTs in advanced optical setups.