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Chinese Journal of Lasers, Volume. 45, Issue 7, 0701001(2018)

Characteristics of Second Harmonic Generation in Erbium Doped Femtosecond Fiber Lasers Based on Quasi Phase Matching

Jiarui Wu1, Zhiqiang Lü1, Xing Lu1, Guanyu Liu2, and Kebin Shi1、*
Author Affiliations
  • 1 State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Peking University, Beijing 100871, China
  • 2 State Key Laboratory of Advanced Optical Communication System and Networks of Peking University,Beijing 100871, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (7)
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    References (21)
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    Figures & Tables(7)
    Schematic of the experimental device

    Fig. 1. Schematic of the experimental device

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    (a) Optical spectrum and (b) autocorrelation image of erbium doped pulse oscillators

    Fig. 2. (a) Optical spectrum and (b) autocorrelation image of erbium doped pulse oscillators

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    (a) Optical spectrum of amplified pulse after compression; (b) autocorrelation image of amplified pulse before compression; (c) beam quality M2 curve; (d) autocorrelation image after compression

    Fig. 3. (a) Optical spectrum of amplified pulse after compression; (b) autocorrelation image of amplified pulse before compression; (c) beam quality M2 curve; (d) autocorrelation image after compression

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    Autocorrelation images of PPLN crystals with different thicknesses. (a) 0.5 mm un-chirped PPLN crystal; (b) 1 mm un-chirped PPLN crystal; (c) 10 mm chirped PPLN crystal

    Fig. 4. Autocorrelation images of PPLN crystals with different thicknesses. (a) 0.5 mm un-chirped PPLN crystal; (b) 1 mm un-chirped PPLN crystal; (c) 10 mm chirped PPLN crystal

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    SHG optical spectra of PPLNs with different thicknesses

    Fig. 5. SHG optical spectra of PPLNs with different thicknesses

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    • Table 1. Influence of PPLN crystal thickness on SHG from 780 nm to 1560 nm

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      Table 1. Influence of PPLN crystal thickness on SHG from 780 nm to 1560 nm

      Style ofPPLNThicknessof PPLNd /mmPower ofseedpulse /mWPower of amplifiedpulse beforecompression /mWPower of amplifiedpulse aftercompression /mWPower ofsecond-harmonicpulse /mWEnergyconversionefficiency /%Pulse widthof second-harmonicpulse /fs
      Un-chirped0.588.2523424100.423.7104
      Un-chirped188.2523423165.039.0161
      Chirped1088.2523424185.543.7305

    • Table 2. Comparison of spectrum bandwidth, frequency bandwidth and pulse width with different thicknesses PPLNs

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      Table 2. Comparison of spectrum bandwidth, frequency bandwidth and pulse width with different thicknesses PPLNs

      ParameterValue
      Un-chirpedd=0.5 mmUn-chirpedd=1 mmChirpedd=10 mm
      Spectrum bandwidthΔλ /nm10.56.42.6
      Frequency bandwidthΔν /(1012 Hz)5.1743.1541.259
      Pulse width by Gaussianfitting Δτ1 /fs85.2140350
      Pulse width byexperiment Δτ2 /fs104161305
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    Jiarui Wu, Zhiqiang Lü, Xing Lu, Guanyu Liu, Kebin Shi. Characteristics of Second Harmonic Generation in Erbium Doped Femtosecond Fiber Lasers Based on Quasi Phase Matching[J]. Chinese Journal of Lasers, 2018, 45(7): 0701001

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    Paper Information

    Category: laser devices and laser physics

    Received: Nov. 27, 2017

    Accepted: --

    Published Online: Sep. 11, 2018

    The Author Email: Shi Kebin (kebinshi@pku.edu.cn)

    DOI:10.3788/CJL201845.0701001

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology