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  • Received: Feb. 7, 2020

    Accepted: Jun. 17, 2020

    Posted: Jun. 18, 2020

    Published Online: Aug. 6, 2020

    The Author Email: Feng Li (enlf@polyu.edu.hk)

    DOI: 10.1364/PRJ.390076

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    Dongmei Huang, Feng Li, Chao Shang, Zihao Cheng, P. K. A. Wai. Reconfigurable time-stretched swept laser source with up to 100 MHz sweep rate, 100 nm bandwidth, and 100 mm OCT imaging range[J]. Photonics Research, 2020, 8(8): 08001360

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Photonics Research, Vol. 8, Issue 8, 08001360 (2020)

Reconfigurable time-stretched swept laser source with up to 100 MHz sweep rate, 100 nm bandwidth, and 100 mm OCT imaging range 

Dongmei Huang1,2, Feng Li1,2,*, Chao Shang2,3,4, Zihao Cheng1,2, and P. K. A. Wai1,2

Author Affiliations

  • 1Photonics Research Centre, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, China
  • 2The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, China
  • 3Photonics Research Centre, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, China
  • 4Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Science, Beijing Jiaotong University, Beijing 100044, China

Abstract

The sweep rate, sweep range, and coherence length of swept sources, respectively, determine the acquisition rate, axial resolution, and imaging range of optical coherence tomography (OCT). In this paper, we demonstrate a reconfigurable high-speed and broadband swept laser by time stretching of a flat spectrum femtosecond pulse train with over 100 nm bandwidth and a repetition rate of 100 MHz. By incorporating an optical modulator and utilizing appropriate dispersive modules, the reconfiguration of the swept source is demonstrated with sweep rates of 25 and 2.5 MHz. The 2.5 MHz swept source enables an imaging range of >110 mm with 6 dB sensitivity roll-off in OCT, which is the longest imaging range ever reported for megahertz OCT.

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