Wavefront correction by target-phase-locking technology in a 500 TW laser facility

Wang, D E; Dai, Weizhong; Zhou, Kainan; Su, Jingqin; Xue, Qiao; Yuan, Qiang; Zhang, X; Deng, Xiaotie; Yang, Ying; Wang, Y C; Xie, Na; Sun, Laixi; D, Hu; Zhu, Qihua

doi:10.1088/1612-202x/aa52fe

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…In the experiment, the MR is measured as the performance metric J since it is an attractive one which gives straightforward mathematical meaning to the idea of energy spread and accounts for the whole intensity distribution [16]. The flow chart of the algorithm is similar to the one in another reference [17].…”

Section: (B))mentioning

confidence: 99%

Improvement of focusing performance for a multi-petawatt OPCPA laser facility

Zhou¹,

Huang²,

Zeng³

et al. 2018

Laser Phys.

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In the paper, we demonstrate improvement of the focused intensity for a multi-petawatt optical parametric chirped-pulse amplification laser facility by several methods. An adaptive optics system with a large-size deformable mirror is employed and it applies a closed-loop correction method based on detection of the on-target focal spot rather than wavefront. In addition, a pair of achromatic lenses is designed and utilized to compensate chromatic and spherical aberrations of the laser system. Moreover, the additional dynamic aberrations introduced by 3-stage optical parametric amplifiers are investigated experimentally. After optimization, the focal spot size (full width at half maximum, FWHM) is 3.3 µm × 4.0 µm in x-axis and y-axis directions and the enclosed energy in FWHM is 28% when an on-axis parabolic mirror with a focal length of 800 mm is used. The focused intensity of ~4 × 10 21 W cm −2 has been achieved for a 1.6 PW shot. The laser intensity is expected to be 10 22 W cm −2 or higher for 4.9 PW peak power.

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Section: (B))mentioning

confidence: 99%

Improvement of focusing performance for a multi-petawatt OPCPA laser facility

Zhou¹,

Huang²,

Zeng³

et al. 2018

Laser Phys.

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“…To ensure its proper operation in the vacuum, the manufacturer selected the piezo electric actuators and the adhesive strictly and optimized the bonding process. The static and thermal wavefront aberrations of the whole system are corrected in two steps [20]. Firstly, the static wavefront aberrations are corrected by a farfield stochastic parallel gradient decent (SPGD) closed-loop technique via a focal spot sampling system behind the target which includes a sampling mirror, a lens and a charge-coupled device (CCD) (see figure 4).…”

Section: Design Of the Picosecond And Nanosecond Beamsmentioning

confidence: 99%

The Xingguang-III laser facility: precise synchronization with femtosecond, picosecond and nanosecond beams

Zhu

Zhou

et al. 2017

Laser Phys. Lett.

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We report a high-intensity laser facility named Xingguang-III that generates femtosecond, picosecond, and nanosecond beams with three wavelengths, i.e. 800 nm, 1053 nm, and 527 nm, respectively. To the best of our knowledge, the laser facility is the first one which produces three beams with different pulse widths and wavelengths. An optical synchronization technique, combining super continuum generation and femtosecond optical parametric amplification, was developed to ensure three beams are from the same source to achieve precise synchronization. The femtosecond beam is a double chirped-pulseamplification Ti:sapphire laser which applies cross-polarized wave generation to improve the temporal contrast. The picosecond/nanosecond beams utilize the optical parametric amplification + Nd:glass mixed amplification scheme. The output energy and pulse width of the three beams are 20.1 J/26.8 fs, 370.2 J/0.48 ps (shortest), and 575.4 J/1.0 ns, respectively. The smallest synchronization time (peak-to-valley) and the shot-to-shot timing jitter (peak-topeak) of less than 1.32 ps have been achieved for the femtosecond and picosecond beams.

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“…to obtain intensities in the order of 10 20 W cm −2 or more [3][4][5][6][7]. To attain a higher intensity to carry out experiments such as on x-ray sources, high harmonic generation, electron acceleration, laser fusion, and relativistic plasma physics, a closed-loop AO system is used in TW and PW chirped pulse amplification (CPA) laser systems [8,9]. Using a closed-loop AO system, Chanteloup et al employed a 10 mW CW laser, an achromatic three-wave transverse shear interferometer as a wavefront sensor, and an optically addressed liquid crystal light valve as a wavefront corrector.…”

Section: Introductionmentioning

confidence: 99%

Optimal design of an adaptive optical system for improving the focusing capability of a high-field laser

Chen¹,

Zhang²,

Ke³

et al. 2019

Laser Phys.

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The adaptive optical system of a TW chirped pulse amplification laser based on Ti:Sapphire was optimized considering the wavefront distortion due to the focusing system itself. A much smaller focal spot was obtained experimentally, and the energy concentration was improved. The size of the focal spot decreased from 2.3 times the diffraction limit to 1.17 times, and more than 50% of the energy was concentrated in the Airy disk. After optimizing the adaptive optical system, we generated hot electrons using a 4 TW laser system under a relativistic power intensity condition. The proposed laser is expected to offer a better experimental condition for laser-matter interaction.

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Wavefront correction by target-phase-locking technology in a 500 TW laser facility

Cited by 4 publications

References 31 publications

Improvement of focusing performance for a multi-petawatt OPCPA laser facility

Improvement of focusing performance for a multi-petawatt OPCPA laser facility

The Xingguang-III laser facility: precise synchronization with femtosecond, picosecond and nanosecond beams

Optimal design of an adaptive optical system for improving the focusing capability of a high-field laser

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