Abstract

This research introduces a compact, auto-aligning interferometer engineered for measuring translations with a wide angular working range and picometer precision above $1\;{\rm Hz} $. It presents a design ensuring automatic beam alignment during movement through secondary reflection from a corner reflector. The sensor head, a $20 \times 10 \times 10\;{{\rm mm}^3}$ all-glass quasi-monolithic structure, exhibits a displacement sensitivity below $1 \,\,{\rm pm}/{{\rm Hz}^{1/2}}$ above $1\;{\rm Hz} $ and a wide angular working range of ${\pm}200\;{\rm mrad} $. This versatile optical design holds promise to improve the sensitivity in applications such as laser ranging, optical seismometers, precision manufacturing, and metrology.

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