Application of adaptive optics for controlling the NIF laser performance and spot size

Sacks, Richard A.; Auerbach, Jerome M.; Bliss, Erlan S.; Henesian, Mark A.; Lawson, Janice K.; Manes, Kenneth R.; Renard, P.; Salmon, J. Thaddeus; Trenholme, John B.; Williams, Wade H.; Winters, Scott; Zacharias, R.

doi:10.1117/12.354146

Cited by 10 publications

(10 citation statements)

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“…From table 2, power focusability of focal spot was improved obviously and beam quality was raised apparently after compensating. Especially with the amplitude of wave front 1 A =3 and x y ω = ω =100mm, the power focusability improved above the half. 6.…”

Section: Compensation Resultsmentioning

confidence: 94%

Compensation analysis of low frequency distorted wave front of laser beam

Feng

Zhang

2015

SPIE Proceedings

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Because of low frequency distorted wave front impacting on beam quality in ICF system, a thin mirror with diameter 300mm is optimized in order to compensate the distorted wave front. Meanwhile, the influences of low frequency distorted wave front made to laser beam quality are discussed in detail. Far field beam quality before and after compensating distorted wave front is discussed in detail, too. The analysis results show whether the space scale parameter of the low frequency wave front is altered or the amplitude of the wave front is changed, the amplitude of the wave front decrease obviously, phase gradient reduce during the whole spatial period, the peak of far field intensity increase, power focusability of focal spot is improved obviously.

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Section: Compensation Resultsmentioning

confidence: 94%

Compensation analysis of low frequency distorted wave front of laser beam

Feng

Zhang

2015

SPIE Proceedings

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“…Another technique is that the wave-front sensor detects the wave-front aberrations and DM corrects it 3,4,12 . Obviously, the DM can control the focal spot indirectly.…”

Section: Introductionmentioning

confidence: 99%

“…In order to meet the spot-size requirement and goal, Adaptive Optics technique is used to control the wave-front aberrations. Usually, two kinds of Adaptive Optics techniques are employed in ICF system to correct wave-front aberrations 3,4,7 .…”

Section: Introductionmentioning

confidence: 99%

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A method of aberration measurement and correction for entire beam path of ICF beam path

Yang

et al. 2007

SPIE Proceedings

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In an inertial confinement fusion (ICF) system, wave-front aberrations existed in laser beam will enlarge the focal spot size and decrease power density at the target. Fortunately, an adaptive optical system (AO) could be employed in ICF system to correct the beam aberrations. As a powerful wave-front detector, Hartmann-Shack (H-S) sensor is often utilized as a wave-front sensor in AO. However, H-S sensor can not detect the aberrations after the sampling location. A new method is presented to measure the aberrations of entire ICF beam path in this paper. Based on the AO, a CCD is installed in the target chamber to detect the focal spot distribution. The deformable mirror's (DM) is yielded to different surface shapes; the extra different aberrations are modulated and added to ICF beam path, and then create their corresponding focal spots. The extra aberrations and the corresponding focal spots intensity could be recorded simultaneously by H-S sensor and CCD respectively. An amendatory phase-retrieval algorithm which is introduced can reconstruct the aberrations of entire ICF beam path from the pairs of extra aberrations and their corresponding focal spots intensity. The numerical simulation show that the AO can correct the aberrations of entire beam path of ICF successfully based on this method.

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“…Adaptive Optics (AO) techniques [1][2][3][4][5][8][9][10][11][12][13] have been extensively used to correct the dynamic and static aberrations of the optical systems induced by the optical figuring errors of optical components, inhomogeneity of optical materials, optical components assembling errors, and the turbulence, etc. In ICF system, a high power and high optical beam quality laser pulse is needed to focus on a target to initiate nuclear fusion reaction.…”

Section: Introductionmentioning

confidence: 99%

Medical and industrial application of adaptive optics in Institute of Optics and Electronics, Chinese Academy of Sciences

et al. 2005

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In 1980, the first laboratory on Adaptive Optics in China was established in Institute of Optics and Electronics, Chinese Academy of Sciences. Several adaptive optical systems had been set up and applied in Inertial Confinement Fusion (ICF) and retinal high-resolution imaging. In 1985, the first adaptive optical system for ICF equipment was set up in the world. Another 45 element adaptive optical system was first built for correcting the static and dynamic wavefront aberrations existed in the large-aperture Nd: glass laser for inertial confinement fusion in 2001. Two set adaptive optical system with 19-element and 37-element deformable mirror had been developed for human retina imaging in 2000 and 2002 respectively. In this paper, the function and performance of these adaptive optical systems are described and the experiment results are presented.

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Application of adaptive optics for controlling the NIF laser performance and spot size

Cited by 10 publications

References 0 publications

Compensation analysis of low frequency distorted wave front of laser beam

Compensation analysis of low frequency distorted wave front of laser beam

A method of aberration measurement and correction for entire beam path of ICF beam path

Medical and industrial application of adaptive optics in Institute of Optics and Electronics, Chinese Academy of Sciences

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