强激光与粒子束, 2020, 32 (1): 011012, 网络出版: 2020-03-31
基于双频光源和涡旋相位的互补旋转集束匀滑方案
Conjugate rotation smoothing scheme for laser quad based on dual-frequency laser and spiral phase plate
图 & 表
图 1. Schematic illustration of conjugate rotation smoothing scheme for laser quad based on dual-frequency laser and spiral phase plate
Fig. 1. Schematic illustration of conjugate rotation smoothing scheme for laser quad based on dual-frequency laser and spiral phase plate
图 2. Focused intensity distribution of the laser quad at different time (without continous phase plate), red areas denote the intensity distribution of beam 1 and beam 3, green areas denote the intensity of beam 2 and beam 4
Fig. 2. Focused intensity distribution of the laser quad at different time (without continous phase plate), red areas denote the intensity distribution of beam 1 and beam 3, green areas denote the intensity of beam 2 and beam 4
图 3. Variations of the coherence length and the rotation period with the wavelength difference when the helical charge l ＝±1
Fig. 3. Variations of the coherence length and the rotation period with the wavelength difference when the helical charge l ＝±1
图 4. Surface shape of an original CPP (a) and its conjugate CPP (b). (c) is the far-field intensity distributions of a same laser beam after propagating through these two CPPs. Red regions shows the speckles generated by the original CPP, and green regions within the focal spot show the speckles generated by the conjugate CPP
Fig. 4. Surface shape of an original CPP (a) and its conjugate CPP (b). (c) is the far-field intensity distributions of a same laser beam after propagating through these two CPPs. Red regions shows the speckles generated by the original CPP, and green regions within the focal spot show the speckles generated by the conjugate CPP
图 5. Variation of the linear velocity of the speckles at different locations inside the focal spot
Fig. 5. Variation of the linear velocity of the speckles at different locations inside the focal spot
图 6. Comparison of the conjugate spin-light smoothing scheme at different combination of helical charges with smoothing by spectral dispersion.
Fig. 6. Comparison of the conjugate spin-light smoothing scheme at different combination of helical charges with smoothing by spectral dispersion.
图 7. Focused intensity distribution of the laser quad at different time (without CPP), red areas denote the intensity distribution of beam 1 and beam 3, and green areas denote the intensity distribution of beam 2 and beam 4
Fig. 7. Focused intensity distribution of the laser quad at different time (without CPP), red areas denote the intensity distribution of beam 1 and beam 3, and green areas denote the intensity distribution of beam 2 and beam 4
图 8. (a) Variation of the contrast of the focal spot with the integral time when the beamlets have different beam quality. PV denotes the peak-to-mean value of the wavefront distortion, and a denotes the max-to-mean value of the amplitude modulation. (b) FOPAI curves of the focal spot when the integral time is 5 ps
Fig. 8. (a) Variation of the contrast of the focal spot with the integral time when the beamlets have different beam quality. PV denotes the peak-to-mean value of the wavefront distortion, and a denotes the max-to-mean value of the amplitude modulation. (b) FOPAI curves of the focal spot when the integral time is 5 ps
图 9. Focal spots at different time without the use of continuous phase plates, when both spin-light smoothing scheme and radial smoothing are adopted
Fig. 9. Focal spots at different time without the use of continuous phase plates, when both spin-light smoothing scheme and radial smoothing are adopted
钟哲强, 张彬. 基于双频光源和涡旋相位的互补旋转集束匀滑方案[J]. 强激光与粒子束, 2020, 32(1): 011012. Zheqiang Zhong, Bin Zhang. Conjugate rotation smoothing scheme for laser quad based on dual-frequency laser and spiral phase plate[J]. High Power Laser and Particle Beams, 2020, 32(1): 011012.
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