Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore

High-stable Mode-locked Fiber Lasers for Absolute Distance Measurement based 3D-Coordinate Positioning

Woojeong Lee1, Jungyoon Kim1, Joohyung Lee1,a, Seongheum Han2, Seungman Kim2 and Jeongseok Oh2

1Precision Optical Metrology Laboratory, Seoul National University of Science and Technology, TEL: +82-02-970-9981, Republic of Korea

2Department of Ultra-Precision Machines and Systems, Korea Institute of Machinery & Materials, TEL: +82-42-868-7129, Republic of Korea


We describe highly stable and reliable mode-locked lasers to be exploited in a 3D-coordinate position system. The 3D-coordinate position system has been realized by measuring horizontal, elevation angles, and distance based on the time-of-flight method using a dual mode-locked laser. The mode-locked laser was developed using Er-doped gain fibers to generate a 1550 nm pulse train with a 50 MHz repetition rate. In order to ensure stable and reliable mode-locking operation, the laser was built on a nonlinear amplification loop mirror (NALM) cavity using polarization maintaining fibers (PMF) and fiber components. In addition, a retro-reflector was adopted at the free-space part to obtain wide repetition-rate control with high stability. Finally, we validated the stable and reliable laser operation under shock and vibration environment without any mode-locking expire as well as long-term operation of more than 24 hours.

Keywords: Fiber laser, Polarization maintain fiber, Absolute distance measurement, Femtosecond laser

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