Journal of Applied Optics, Volume. 45, Issue 3, 575(2024)

Efficient iterative algorithm for improving frequency sweep linearity of external cavity lasers

Jiaqi GUO1... Kun LI1,*, Jie CAO1,2, Jingjing LI1 and Yafeng LIANG1 |Show fewer author(s)
Author Affiliations
  • 1School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
  • 2Yangtze Delta Region Academy, Beijing Institute of Technology, Jiaxing 314003, China
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    Aiming at the problem of poor frequency sweep linearity of frequency-modulated continuous wave lidar, a high-efficiency linearization pre-modulation correction method for external cavity diode laser (ECDL) with piezoelectric ceramic external cavities was proposed. Based on the ECDL model of volume grating feedback and the bias characteristics of piezoelectric ceramics, an iterative control algorithm that conformed to the physical properties of piezoelectric ceramics (PZT) was designed, and the high linearity frequency sweep laser output of ECDL was realized. The laser system could achieve a linear frequency sweep with an output bandwidth of 1.1 GHz under the repetition frequency of 60 KHz, and the residual nonlinearity could reach 10?7. The measurement accuracy at the centimeter-level at a distance of 80 m was verified through experiments, and the meter-level measurement accuracy was achieved at a distance of 3 km. The results show that the algorithm can effectively solve the linearization correction problem of ECDL of the PZT.

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    Jiaqi GUO, Kun LI, Jie CAO, Jingjing LI, Yafeng LIANG. Efficient iterative algorithm for improving frequency sweep linearity of external cavity lasers[J]. Journal of Applied Optics, 2024, 45(3): 575

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    Paper Information

    Category: Research Articles

    Received: Apr. 6, 2023

    Accepted: --

    Published Online: Jun. 2, 2024

    The Author Email: LI Kun (李鲲(1987—))

    DOI:10.5768/JAO202445.0310012

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