Volume 15 Issue 3
May  2022
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ZHANG Shi-da, GENG Yi-jia. Ultrafast fiber laser based on bismuth telluride evanescent field mode-locked device[J]. Chinese Optics, 2022, 15(3): 433-442. doi: 10.37188/CO.2021-0216
Citation: ZHANG Shi-da, GENG Yi-jia. Ultrafast fiber laser based on bismuth telluride evanescent field mode-locked device[J]. Chinese Optics, 2022, 15(3): 433-442. doi: 10.37188/CO.2021-0216

Ultrafast fiber laser based on bismuth telluride evanescent field mode-locked device

Funds:  Supported by Science and Technology Development Project of Jilin Province (No. 20210201026GX, No. 20210204188YY)
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  • Corresponding author: gengyijia_jlu@163.com
  • Received Date: 13 Dec 2021
  • Rev Recd Date: 04 Jan 2022
  • Accepted Date: 13 Feb 2022
  • Available Online: 07 Apr 2022
  • Publish Date: 15 May 2022
  • In order to realize the passively harmonic mode-locking with high repetition rate in the fiber laser. A saturable absorber (SA) based on two dimensional (2D) topological insulators material of Bismuth telluride (Bi2Te3), combining with a side-polished fiber, was fabricated by laser deposition technology in this study. This device has a modulation depth of 23.96%, nonsaturable loss of 37.77% and saturable intensity of 31.5 MW/cm2. According to the adjustment of dispersion in the whole cavity and the excellent nonlinear saturable absorb character in topological insulator materials, a self-starting mode-locking is realized successfully when this SA device is applied in the Er-doped fiber laser, with a central wavelength of 1555.67 nm, pulse duration of 487 fs, repetition rate of 47.87 MHz and signal-to-noise ratio of 58 dB. A harmonic mode-locking is achieved when the pump power is over 150 mW. When we adjust and increase slightly the pump power till 250 mW, the harmonic mode-locking of 11 orders is achieved with the repetition rate of 528 MHz and the signal-to-noise ratio of 41.5 dB. These results demonstrate that with the evanescent field produced by the side-polished fiber, the damage threshold of materials can be improved and the passively harmonic mode-locking with high repetition rate is realized, which has a great significance for the materials in the application of ultrafast fiber laser with high repetition rate.

     

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