• High Power Laser Science and Engineering
  • Vol. 13, Issue 2, 02000e28 (2025)
Hua Tao1,*, Xiaoliang He1,2, Chengcheng Chang1, Liqing Wu1..., Deng Liu3, Fei Chen3, Cheng Liu1,2 and Jianqiang Zhu1|Show fewer author(s)
Author Affiliations
  • 1National Laboratory on High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China
  • 2School of Science, Jiangnan University, Wuxi, China
  • 3A Center of Equipment Development Department, Beijing, China
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    DOI: 10.1017/hpl.2025.15 Cite this Article Set citation alerts
    Hua Tao, Xiaoliang He, Chengcheng Chang, Liqing Wu, Deng Liu, Fei Chen, Cheng Liu, Jianqiang Zhu, "Computational near-field and far-field parameter measurement of high-power lasers using modified coherent modulation imaging," High Power Laser Sci. Eng. 13, 02000e28 (2025) Copy Citation Text show less
    Schematic illustration of the MCMI method.
    Fig. 1. Schematic illustration of the MCMI method.
    (a) Optical path schematic diagram of the MCMI method. (b) MCMI measurement package in the Shenguang-II laser device. (c) Location of components in the MCMI measurement package.
    Fig. 2. (a) Optical path schematic diagram of the MCMI method. (b) MCMI measurement package in the Shenguang-II laser device. (c) Location of components in the MCMI measurement package.
    Pre-characterized modulation function of the RPP. (a) Intensity distribution and (b) phase distribution.
    Fig. 3. Pre-characterized modulation function of the RPP. (a) Intensity distribution and (b) phase distribution.
    Static aberration calibration with a point laser source using the traditional CMI algorithm. (a) Intensity image recorded by CCD1. (b) Retrieved intensity on the RPP plane. (c) Retrieved phase on the RPP plane. (d) Calculated near-field intensity. (e) Calculated near-field wavefront.
    Fig. 4. Static aberration calibration with a point laser source using the traditional CMI algorithm. (a) Intensity image recorded by CCD1. (b) Retrieved intensity on the RPP plane. (c) Retrieved phase on the RPP plane. (d) Calculated near-field intensity. (e) Calculated near-field wavefront.
    Static aberration calibration with a point laser source using the MCMI algorithm. (a) Intensity image recorded by CCD1. (b) Intensity image recorded by CCD2. (c) Retrieved intensity on the RPP plane. (d) Retrieved phase on the RPP plane. (e) Calculated near-field intensity. (f) Calculated near-field wavefront.
    Fig. 5. Static aberration calibration with a point laser source using the MCMI algorithm. (a) Intensity image recorded by CCD1. (b) Intensity image recorded by CCD2. (c) Retrieved intensity on the RPP plane. (d) Retrieved phase on the RPP plane. (e) Calculated near-field intensity. (f) Calculated near-field wavefront.
    Error convergence curves observed during the iterative calculation process.
    Fig. 6. Error convergence curves observed during the iterative calculation process.
    Computational measurement of a high-power laser of energy 3272 J and pulse width 3 ns. (a) Intensity image recorded by CCD1. (b) Intensity image recorded by CCD2. (c) Retrieved intensity on the RPP plane. (d) Retrieved phase on the RPP plane. (e) Calculated near-field wavefront including static aberrations.
    Fig. 7. Computational measurement of a high-power laser of energy 3272 J and pulse width 3 ns. (a) Intensity image recorded by CCD1. (b) Intensity image recorded by CCD2. (c) Retrieved intensity on the RPP plane. (d) Retrieved phase on the RPP plane. (e) Calculated near-field wavefront including static aberrations.
    Comparison measurement results for a high-power laser of energy 3272 J and pulse width 3 ns. (a) Near-field intensity calculated using MCMI. (b) Near-field phase calculated using MCMI. (c) Far-field focal spot calculated using the MCMI method. (d) Encircled energy corresponding to the focal spot shown in (c). (e) Near-field intensity directly measured and captured by CCD4. (f) Near-field phase directly recorded by a Shack–Hartmann wavefront sensor. (g) Far-field intensity directly captured by CCD3. (h) Encircled energy corresponding to the focal spot shown in (g).
    Fig. 8. Comparison measurement results for a high-power laser of energy 3272 J and pulse width 3 ns. (a) Near-field intensity calculated using MCMI. (b) Near-field phase calculated using MCMI. (c) Far-field focal spot calculated using the MCMI method. (d) Encircled energy corresponding to the focal spot shown in (c). (e) Near-field intensity directly measured and captured by CCD4. (f) Near-field phase directly recorded by a Shack–Hartmann wavefront sensor. (g) Far-field intensity directly captured by CCD3. (h) Encircled energy corresponding to the focal spot shown in (g).
    Computational evolution of the focal spot in proximity to the focal plane. These images were obtained through the computational propagation of the reconstructed complex amplitude along the optical axis. These images share the same scale bar.
    Fig. 9. Computational evolution of the focal spot in proximity to the focal plane. These images were obtained through the computational propagation of the reconstructed complex amplitude along the optical axis. These images share the same scale bar.
    Computational measurement of a high-power laser of energy 8558 J and pulse width of 5 ns. (a) Intensity pattern recorded by CCD1. (b) Intensity pattern recorded by CCD2. (c) Retrieved intensity on the RPP plane. (d) Retrieved phase on the RPP plane. (e) Calculated near-field wavefront including static aberrations.
    Fig. 10. Computational measurement of a high-power laser of energy 8558 J and pulse width of 5 ns. (a) Intensity pattern recorded by CCD1. (b) Intensity pattern recorded by CCD2. (c) Retrieved intensity on the RPP plane. (d) Retrieved phase on the RPP plane. (e) Calculated near-field wavefront including static aberrations.
    Comparison measurement results for a high-power laser of energy 8558 J and pulse width 5 ns. (a) Near-field intensity calculated using MCMI. (b) Near-field phase calculated using MCMI. (c) Far-field focal spot calculated using the MCMI method. (d) Encircled energy corresponding to the focal spot shown in (c). (e) Near-field intensity directly measured and captured by CCD4. (f) Near-field phase directly recorded by a Shack–Hartmann wavefront sensor. (g) Far-field intensity directly measured and captured by CCD3. (h) Encircled energy corresponding to the focal spot shown in (g).
    Fig. 11. Comparison measurement results for a high-power laser of energy 8558 J and pulse width 5 ns. (a) Near-field intensity calculated using MCMI. (b) Near-field phase calculated using MCMI. (c) Far-field focal spot calculated using the MCMI method. (d) Encircled energy corresponding to the focal spot shown in (c). (e) Near-field intensity directly measured and captured by CCD4. (f) Near-field phase directly recorded by a Shack–Hartmann wavefront sensor. (g) Far-field intensity directly measured and captured by CCD3. (h) Encircled energy corresponding to the focal spot shown in (g).
    Computational evolution of the focal spot in proximity to the focal plane. These images were obtained through the computational propagation of the reconstructed complex amplitude along the optical axis. These images share the same scale bar.
    Fig. 12. Computational evolution of the focal spot in proximity to the focal plane. These images were obtained through the computational propagation of the reconstructed complex amplitude along the optical axis. These images share the same scale bar.
    PSD curves of focal spots from the above two experimental shots.
    Fig. 13. PSD curves of focal spots from the above two experimental shots.
    Near-field (intensity and wavefront) spatial resolution. (a) Reconstructed near-field intensity using MCMI. (b) Magnified image emphasized in (a). (c) Reconstructed near-field wavefront using MCMI.
    Fig. 14. Near-field (intensity and wavefront) spatial resolution. (a) Reconstructed near-field intensity using MCMI. (b) Magnified image emphasized in (a). (c) Reconstructed near-field wavefront using MCMI.
    Hua Tao, Xiaoliang He, Chengcheng Chang, Liqing Wu, Deng Liu, Fei Chen, Cheng Liu, Jianqiang Zhu, "Computational near-field and far-field parameter measurement of high-power lasers using modified coherent modulation imaging," High Power Laser Sci. Eng. 13, 02000e28 (2025)
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