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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
05:57

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Published on: April 1, 2020

Precision angle sensor using an optical lever inside a Sagnac interferometer.

J M Hogan1, J Hammer, S-W Chiow

  • 1Department of Physics, Stanford University, Stanford, California 94305, USA.

Optics Letters
|May 5, 2011
PubMed
Summary
This summary is machine-generated.

We developed an ultra-low-noise angle sensor using a folded optical lever and Sagnac interferometer. This innovative sensor achieves a record angle sensitivity of 1.3 prad/√Hz, paving the way for future subpicoradian measurements.

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Last Updated: Jun 2, 2026

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Area of Science:

  • Physics
  • Optical Engineering
  • Metrology

Background:

  • High-precision angle sensing is crucial for various scientific and technological applications.
  • Existing angle sensors face limitations in noise floor and sensitivity.

Purpose of the Study:

  • To develop an ultra-low-noise angle sensor with record sensitivity.
  • To demonstrate the potential of combining optical lever and Sagnac interferometer techniques.

Main Methods:

  • Integrated a folded optical lever with a Sagnac interferometer.
  • Utilized a proof-of-concept apparatus with N=11 bounces in the optical lever.

Main Results:

  • Achieved a measured noise floor of 1.3 prad/√Hz at 2.4 kHz.
  • Demonstrated record angle sensitivity for this class of instruments.

Conclusions:

  • The combined technique offers a pathway to unprecedented angle sensitivity.
  • Further optimization could lead to subpicoradian/√Hz sensitivities.