Development of a compact adjustable fiber collimator mount for opto-mechanical accelerometers

Ian Harley-Trochimczyk; Xiangyu Guo; Felipe Guzmán

doi:10.1117/12.3027731

1 October 2024 Development of a compact adjustable fiber collimator mount for opto-mechanical accelerometers

Ian Harley-Trochimczyk, Xiangyu Guo, Felipe Guzmán

Proceedings Volume 13130, Novel Optical Systems, Methods, and Applications XXVII; 1313002 (2024) https://doi.org/10.1117/12.3027731
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Abstract

Precise alignment of laser beams used in heterodyne interferometry is vital and necessary to the precision, accuracy, and quality of the measurement, but off the shelf-based breadboard setups have a large physical footprint and many components that can introduce unwanted noise. Our lab creates optomechanical accelerometer devices including a fused silica resonator with a 5Hz natural frequency and uses a heterodyne displacement interferometer to readout the position of the test mass, which can then be used to determine the acceleration of the device. A novel compact fiber injector system design is presented here that reduces the footprint of the fiber collimator input of the heterodyne interferometer by an order of magnitude from a breadboard setup, down to 24 x 16 x 19 mm. This new injector system integrates both fibers of different frequencies directly onto the mount with the resonator, increasing stability and reducing entry points for vibrational noise while minimizing the optical path length difference between beams. Each beam can then be independently tilted and de-centered to maximize the fringe visibility at the output of the interferometer, using spring-loaded adjustment screws and secured in place with locking screws. An accelerometer using these injectors measured a displacement of 10^-9 m/√Hz at 10^-2 Hz in air with the test mass anchored, nearly identical to the previous breadboard setup while being much more compact and portable. I will present the design, integration onto an accelerometer, and the initial acceleration noise measurements taken using these fiber injector systems.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Ian Harley-Trochimczyk, Xiangyu Guo, and Felipe Guzmán "Development of a compact adjustable fiber collimator mount for opto-mechanical accelerometers", Proc. SPIE 13130, Novel Optical Systems, Methods, and Applications XXVII, 1313002 (1 October 2024); https://doi.org/10.1117/12.3027731

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