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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 17,
  • Issue 9,
  • pp. 091202-
  • (2019)

Large-scale absolute distance measurement with dual free-running all-polarization-maintaining femtosecond fiber lasers

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Abstract

We demonstrate a robust femtosecond LIDAR setup by using two free-running environmentally stable all-polarization-maintaining nonlinear amplified loop mirror mode-locked fiber lasers. Based on the asynchronous optical sampling method, a ranging accuracy of ±2 μm within 65 m has been achieved, as tested in an 80-m-long underground optical tunnel. Through the Kalman filter in real-time data processing, the measurement accuracy can be maintained at a 200 Hz update rate. This setup provides a practical tool for various large-scale industrial and astronomical ranging applications.

© 2019 Chinese Laser Press

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