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Interferometers play a crucial role in high-precision displacementmeasurement such as gravitational-wave detection. Conventional interferometerdesigns require accurate laser alignment, including the laser pointing and thewaist position, to maintain high interference contrast during motion. Althoughthe corner reflector returns the reflected beam in parallel, there is still aproblem of lateral beam shift which reduces the interference contrast. Thispaper presents a new compact interferometric sensor head design for measuringtranslations with auto-alignment. It works without laser beam alignmentadjustment and maintains high interferometric contrast during arbitrary motion(tilts as well as lateral translation). Automatic alignment of the measuringbeam with the reference beam is possible by means of a secondary reflectiondesign with a corner reflector. A 20*10*10mm^3 all-glass quasi-monolithicsensor head is built based on UV adhesive bonding and tested by a piezoelectric(PZT) positioning stage. Our sensor head achieved a displacement sensitivity of1 pm/Hz^1/2 at 1Hz with a tilt dynamic range over +/_200 mrad. This opticaldesign can be widely used for high-precision displacement measurement over alarge tilt dynamic range, such as torsion balances and seismometers.

Quasi-monolithic Compact Interferometric Sensor Head Design with Laser Auto-alignment