Conjugate rotation smoothing scheme for laser quad based on dual-frequency laser and spiral phase plate

Zhong Zheqiang; Zhang Bin

doi:10.11884/HPLPB202032.190454

Volume 32 Issue 1

Dec. 2019

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Zhong Zheqiang, Zhang Bin. 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: 011012. doi: 10.11884/HPLPB202032.190454

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Zhong Zheqiang, Zhang Bin. 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: 011012. doi: 10.11884/HPLPB202032.190454

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Conjugate rotation smoothing scheme for laser quad based on dual-frequency laser and spiral phase plate

doi: 10.11884/HPLPB202032.190454

Zhong Zheqiang,
Zhang Bin^,

College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China

Received Date: 2019-11-29
Rev Recd Date: 2019-12-24
Publish Date: 2019-12-26

Abstract

Abstract

Conjugate rotation smoothing scheme for laser quad based on dual-frequency laser and spiral phase plate was proposed. The dual-frequency laser provides frequency shift among the beamlets, the spiral phase plates with same helical charge but opposite sign transform the beamlets into Laguerre-Gaussian beams, and the polarization control is applied to make these beamlets coherently superposed on the target plane. On this basis, the conjugate continuous phase plates are adopted to enable the beamlets with different central wavelength and orthogonal polarization form focal spots with rapid rotation. Moreover, the spatiotemporal focal spot of the laser quad looks like conjugate spin light because of the frequency beats. It is indicated that, the scheme enables the fine-scale speckles within the focal spot rotate in a period of a few picoseconds, and even exhibit different intensities and wavelengths at different time and different positions. Hence, the novel scheme can effectively smooth the irradiation uniformity of the laser quad and even has the potential to mitigate laser plasma interactions.
- inertial confinement fusion,
- beam smoothing for laser quad,
- spiral phase,
- irradiation uniformity,
- laser plasma instabilities

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References(16)

References

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