National Ignition Facility alignment and wavefront control

Zacharias, R.; Beer, Neil Reginald; Bliss, Erlan S.; Burkhart, Scott C.; Cohen, Simon J.; Sutton, Steven B.; Atta, Rinki; Winters, Scott; Salmon, J. Thaddeus; Stolz, Christopher J.; Pigg, D.; Arnold, Timothy

doi:10.1117/12.538469

Cited by 18 publications

(8 citation statements)

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“…In addition to minimizing these parameters by advanced finishing 2 and coating 3 technologies, both of these parameters can be further reduced within the main laser section with a full-aperture deformable mirror. 11 The PSD over spatial lengths from 0.12 mm to 33 mm predominately control nonlinear amplification of the beam leading to high contrast as defined by the peak over mean intensity. Low contrast ratios are desired to maximize the energy to the target for a given laser damage threshold of the optical components.…”

Section: Wavefrontmentioning

confidence: 99%

Metrology of mirrors for the National Ignition Facility

et al. 2004

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The large-aperture (up to 40 cm × 80 cm) mirrors required for the National Ignition Facility have very stringent specifications. The specifications include requirements for transmitted and reflected wavefront over a wide spectral frequency, surface quality, laser resistance, spectral characteristics, etc. In order to validate optic performance, metrology tools were fielded at optic fabrication vendors to assure production control. These tools include interferometers, largearea conditioning stations, and photometers. Of the 1800 large-aperture mirrors required for the NIF, approximately 35% have been completed. This presentation will review the types of large-aperture mirrors used on NIF along with the performance of NIF optics as measured and received from our vendors.

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Section: Wavefrontmentioning

confidence: 99%

Metrology of mirrors for the National Ignition Facility

et al. 2004

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“…The wavefront can be obtained by many optical measurement techniques; two typical approaches of which are wavefront direct measurements by interferometers [4,5] and wavefront slope measurements by Shack-Hartmann wavefront sensors (SHWFS) [6,7]. In addition to being used to reconstruct the wavefront, the wavefront slope is also used as an optics specification [8] in a laser system to meet performance goals.…”

Section: Introductionmentioning

confidence: 99%

Modal wavefront reconstruction from slope measurements for rectangular apertures

Zhang

et al. 2015

J. Opt. Soc. Am. A

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We present a modal wavefront reconstruction from slope measurements for rectangular optical components of high-power laser systems. Wavefront reconstruction with slope data is an important approach used for wavefront control or correction in high-power systems. In this work, we derive a complete set of orthonormal wavefront slope polynomials for rectangular apertures and describe the modal method for obtaining wavefront representation with the aberration balancing property. Error propagation properties for the modal method are evaluated and compared with the Southwell method. The cross-coupling error is also discussed. Numerical experiments are conducted to illustrate that the modal method can achieve a higher accuracy than the Southwell method. In addition, we also investigate the influence of noise on the modal method compared with that of the Southwell method.

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“…Eventually the average of 96 beams entering each laser entrance hole of target matches the goal position to within 25 µm, and the random variations in beam pointing relative to aim point are less than 50 µm (RMS). [4][5][6][10][11][12] Different from the NIF, the target and beam alignment of laser mégajoule (LMJ) are done by common reference (CR) and telemicroscope (SOPAC) which is made up of six face-to-face tele-microscopes. As an emitter/receptor system, the CR can locate the 3ω autocollimation spot reflected successively by each Final Optic Assemblies (FOA) beam and define the target frame origin of tele-microscopes.…”

Section: Introductionmentioning

confidence: 99%

A target positioning and laser beam pointing system used for laser-induced plasma experiments

Wang

Xue

Zhao

et al. 2022

Sixth International Symposium on Laser Interaction With Matter

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In the high-power laser device, through precisely positioning the target and pointing multiple laser beams at a very small area on the target surface, the laser power density coupled with the target can be greatly improved and is conducive to the research of laser-induced plasma experiments. This paper proposes a set of target positioning and laser beam pointing system, which has advantages of high experiment efficiency, high target positioning and laser pointing accuracy. This system can automatically correct the attitude and position of targets, and make all laser converge together by adjusting their incident directions. It was verified that the target positioning error is 14.83 µm and the beam guidance accuracy is 9.70 µm.

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National Ignition Facility alignment and wavefront control

Cited by 18 publications

References 0 publications

Metrology of mirrors for the National Ignition Facility

Metrology of mirrors for the National Ignition Facility

Modal wavefront reconstruction from slope measurements for rectangular apertures

A target positioning and laser beam pointing system used for laser-induced plasma experiments

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