Spatio-temporal focal spot characterization and modeling of the NIF ARC kilojoule picosecond laser

Wade H. Williams; John K. Crane; David A. Alessi; Charles D. Boley; Mark W. Bowers; Alan D. Conder; Jean-Michel G. Di Nicola; Pascale Di Nicola; Constantin Haefner; John M. Halpin; Mathew Y. Hamamoto; John E. Heebner; Mark R. Hermann; Sandrine I. Herriot; Doug C. Homoelle; Daniel H. Kalantar; Thomas E. Lanier; Kai N. LaFortune; Janice K. Lawson; Roger R. Lowe-Webb; Francis X. Morrissey; Hoang Nguyen; Charles D. Orth; Lawrence J. Pelz; Matthew A. Prantil; Michael C. Rushford; Richard A. Sacks; J. Thaddeus Salmon; Lynn G. Seppala; Michael J. Shaw; Ronald J. Sigurdsson; Paul J. Wegner; C. C. Widmayer; Steven T. Yang; Thomas L. Zobrist

doi:10.1364/AO.416846

Applied Optics
Vol. 60,
Issue 8,
pp. 2288-2303
(2021)
•https://doi.org/10.1364/AO.416846

Spatio-temporal focal spot characterization and modeling of the NIF ARC kilojoule picosecond laser

Wade H. Williams, John K. Crane, David A. Alessi, Charles D. Boley, Mark W. Bowers, Alan D. Conder, Jean-Michel G. Di Nicola, Pascale Di Nicola, Constantin Haefner, John M. Halpin, Mathew Y. Hamamoto, John E. Heebner, Mark R. Hermann, Sandrine I. Herriot, Doug C. Homoelle, Daniel H. Kalantar, Thomas E. Lanier, Kai N. LaFortune, Janice K. Lawson, Roger R. Lowe-Webb, Francis X. Morrissey, Hoang Nguyen, Charles D. Orth, Lawrence J. Pelz, Matthew A. Prantil, Michael C. Rushford, Richard A. Sacks, J. Thaddeus Salmon, Lynn G. Seppala, Michael J. Shaw, et al.

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Wade H. Williams, John K. Crane, David A. Alessi, Charles D. Boley, Mark W. Bowers, Alan D. Conder, Jean-Michel G. Di Nicola, Pascale Di Nicola, Constantin Haefner, John M. Halpin, Mathew Y. Hamamoto, John E. Heebner, Mark R. Hermann, Sandrine I. Herriot, Doug C. Homoelle, Daniel H. Kalantar, Thomas E. Lanier, Kai N. LaFortune, Janice K. Lawson, Roger R. Lowe-Webb, Francis X. Morrissey, Hoang Nguyen, Charles D. Orth, Lawrence J. Pelz, Matthew A. Prantil, Michael C. Rushford, Richard A. Sacks, J. Thaddeus Salmon, Lynn G. Seppala, Michael J. Shaw, Ronald J. Sigurdsson, Paul J. Wegner, C. C. Widmayer, Steven T. Yang, and Thomas L. Zobrist, "Spatio-temporal focal spot characterization and modeling of the NIF ARC kilojoule picosecond laser," Appl. Opt. 60, 2288-2303 (2021)

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- Lasers, Optical Amplifiers, and Laser Optics
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About this Article
History
- Original Manuscript: December 21, 2020
- Revised Manuscript: February 10, 2021
- Manuscript Accepted: February 10, 2021
- Published: March 8, 2021

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Abstract

The advanced radiographic capability (ARC) laser system, part of the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory, is a short-pulse laser capability integrated into the NIF. The ARC is designed to provide adjustable pulse lengths of ${\sim}{1} {-} 38\;{\rm ps}$ in four independent beamlets, each with energies up to 1 kJ (depending on pulse duration). A detailed model of the ARC lasers has been developed that predicts the time- and space-resolved focal spots on target for each shot. Measurements made to characterize static and dynamic wavefront characteristics of the ARC are important inputs to the code. Modeling has been validated with measurements of the time-integrated focal spot at the target chamber center (TCC) at low power, and the space-integrated pulse duration at high power, using currently available diagnostics. These simulations indicate that each of the four ARC beamlets achieves a peak intensity on target of up to a few ${{10}^{18}}\;{\rm W}/{{\rm cm}^2}$.

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Beamline	Beamlet	G1 [lines/mm]	G2 [lines/mm]	G3 [lines/mm]	G4 [lines/mm]
353	A	1753.34	1753.30	1782.63	1782.65
353	B	1748.67	1748.87	1779.07	1779.11
354	A	1753.36	1753.32	1782.64	1782.66
354	B	1748.72	1748.81	1779.12	1779.13

Subsystem	$ϕ^{''}$ [ ${p s}^{2} / r a d$ ]	$ϕ^{'''}$ [ ${p s}^{3} / {r a d}^{2}$ ]	$ϕ^{''''}$ [ ${p s}^{4} / {r a d}^{3}$ ]
Martinez stretcher	318.71	−4.84	0.122
PWC-A, 1 ps	−27.97	0.37	−0.008
PWC-A, 30 ps	−19.91	0.262	−0.006
PWC-B, 1 ps	−43.83	0.745	−0.021
PWC-B, 30 ps	−36.31	0.617	−0.017
ADT, 30 ps	−7.74	0.11	−0.003
Material	0.234	0.0012	−2E-6

Subsystem	$ϕ^{''}$ [ ${p s}^{2} / r a d$ ]	$ϕ^{'''}$ [ ${p s}^{3} / {r a d}^{2}$ ]	$ϕ^{''''}$ [ ${p s}^{4} / {r a d}^{3}$ ]
353/4A	−290.7	4.46	−0.117
353/4B	−274.3	4.08	−0.102

	Pulse Duration (ps)
Beamlet	Shot Number	VBL	FROG
B354B	N180213-002	2.0	1.7
B353A	N180506-002	7.7	9.8
B354A	N180802-001	8.0	9.8
B354B	N170517-003	11.5	11.3
B354A	N180507-001	26.0	27.9
B353A	N180614-001	32.8	35.7

Beamline	Beamlet	G1 [lines/mm]	G2 [lines/mm]	G3 [lines/mm]	G4 [lines/mm]
353	A	1753.34	1753.30	1782.63	1782.65
353	B	1748.67	1748.87	1779.07	1779.11
354	A	1753.36	1753.32	1782.64	1782.66
354	B	1748.72	1748.81	1779.12	1779.13

David A. Alessi	https://orcid.org/0000-0002-6045-5838
John E. Heebner	https://orcid.org/0000-0003-2207-3916
Sandrine I. Herriot	https://orcid.org/0000-0002-8555-8948

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Applied Optics