Large optics metrology for high-power lasers

Stéphane Bouillet; Christel Ameil; Vincent Beau; Odile Bonville; Sandy Cavaro; Roger Courchinoux; Jérôme Daurios; Thierry Donval; Laure Eupherte; Sandrine Fréville; Gaël Gaborit; Isabelle Lebeaux; Christophe Leymarie; Sébastien Martin; Romain Parreault; Gérard Razé; Nadja Roquin; Laurent Lamaignère

doi:10.1364/JOSAA.36.000C95

Large optics metrology for high-power lasers

Stéphane Bouillet, Christel Ameil, Vincent Beau, Odile Bonville, Sandy Cavaro, Roger Courchinoux, Jérôme Daurios, Thierry Donval, Laure Eupherte, Sandrine Fréville, Gaël Gaborit, Isabelle Lebeaux, Christophe Leymarie, Sébastien Martin, Romain Parreault, Gérard Razé, Nadja Roquin, and Laurent Lamaignère

Journal of the Optical Society of America A
Vol. 36,
Issue 11,
pp. C95-C103
(2019)
•https://doi.org/10.1364/JOSAA.36.000C95

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Stéphane Bouillet, Christel Ameil, Vincent Beau, Odile Bonville, Sandy Cavaro, Roger Courchinoux, Jérôme Daurios, Thierry Donval, Laure Eupherte, Sandrine Fréville, Gaël Gaborit, Isabelle Lebeaux, Christophe Leymarie, Sébastien Martin, Romain Parreault, Gérard Razé, Nadja Roquin, and Laurent Lamaignère, "Large optics metrology for high-power lasers," J. Opt. Soc. Am. A 36, C95-C103 (2019)

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About this Article
History
- Original Manuscript: June 25, 2019
- Revised Manuscript: September 30, 2019
- Manuscript Accepted: September 30, 2019
- Published: October 23, 2019
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JOSA A Feature Issue: Classical Optics in France (2019)

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Abstract

The Laser MégaJoule (LMJ) is a high-power laser dedicated to laser-plasma experiments. At the beginning of the project in the mid-1990s, an optical metrology laboratory was created at CEA to help accomplish all the steps in the construction of this laser. This paper proposes an overview of the capabilities of this metrology laboratory in four main fields: surface imperfections, photometry, laser damage measurement, and wavefront measurement. The specificities for high-power laser optics in each domain are highlighted as well as the specific features that make our instruments unique.

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Specifications ISO 10110-7	IR Components (1053 nm)	UV Components (351 nm)
${\emptyset 33}\,\,{\rm mm}$ $\emptyset 33 m m$	${5/1 \times 0.250}$ $5 / 1 \times 0.250$ ; ${\rm L1} \times 0.060$ $L 1 \times 0.060$	${5/1 \times 0.010}$ $5 / 1 \times 0.010$ ; ${\rm L1} \times 0.010$ $L 1 \times 0.010$
Clear aperture	${5/256 \times 0.250}$ $5 / 256 \times 0.250$ ; ${\rm L5} \times 0.060\,\,{\rm E0.5}$ $L 5 \times 0.060 E 0.5$	${5/10 \times 0.010}$ $5 / 10 \times 0.010$ ; ${\rm L5} \times 0.010\,{\rm E0.5}$ $L 5 \times 0.010 E 0.5$
Maximum scratch length	50 mm	30 mm

Components	Specification
Mirrors	${R} \gt {0.99}$ $R > 0.99$
Leak mirrors	${R} \gt {0.98}$ $R > 0.98$ and ${0.009} \lt {T} \lt {0.018}$ $0.009 < T < 0.018$
Polarizers	${Tp} \gt {0.985}$ $T p > 0.985$ and ${Ts} \lt {0.01}$ $T s < 0.01$
Lenses	${T} \gt {0.99}$ $T > 0.99$
Diffraction grating	${T} \gt {0.90}$ $T > 0.90$

Spatial Periods (mm)	Parameter	Typical Specification
$\infty - {10}$ $\infty - 10$	Power peak-to-valley	500 nm
$\infty - {10}$ $\infty - 10$	RMS gradient	1 µrad
10 -- 1	PSD and RMS (WFE)	${\rm RMS} \lt {2.5\,\,{\rm nm}}$ $R M S < 2.5 n m$
		${\rm DSP} \lt {3{\rm f}^{-1.55}\,\,{\rm nm}^{2}\cdot{\rm mm}}$ $D S P < 3 f^{- 1.55} {n m}^{2} \cdot m m$
1 -- 0.1	PSD and RMS (surface)	${\rm RMS} \lt {2}\,\,{\rm nm}$ $R M S < 2 n m$
		${\rm DSP} \lt {3{\rm f}^{-1.55}\,\,{\rm nm}^{2}\cdot{\rm mm}}$ $D S P < 3 f^{- 1.55} {n m}^{2} \cdot m m$
0.001 -- 0.1	RMS (surface)	${\rm RMS} \lt {1}\,\,{\rm nm}$ $R M S < 1 n m$

Specifications ISO 10110-7	IR Components (1053 nm)	UV Components (351 nm)
${\emptyset 33}\,\,{\rm mm}$ $\emptyset 33 m m$	${5/1 \times 0.250}$ $5 / 1 \times 0.250$ ; ${\rm L1} \times 0.060$ $L 1 \times 0.060$	${5/1 \times 0.010}$ $5 / 1 \times 0.010$ ; ${\rm L1} \times 0.010$ $L 1 \times 0.010$
Clear aperture	${5/256 \times 0.250}$ $5 / 256 \times 0.250$ ; ${\rm L5} \times 0.060\,\,{\rm E0.5}$ $L 5 \times 0.060 E 0.5$	${5/10 \times 0.010}$ $5 / 10 \times 0.010$ ; ${\rm L5} \times 0.010\,{\rm E0.5}$ $L 5 \times 0.010 E 0.5$
Maximum scratch length	50 mm	30 mm

Components	Specification
Mirrors	${R} \gt {0.99}$ $R > 0.99$
Leak mirrors	${R} \gt {0.98}$ $R > 0.98$ and ${0.009} \lt {T} \lt {0.018}$ $0.009 < T < 0.018$
Polarizers	${Tp} \gt {0.985}$ $T p > 0.985$ and ${Ts} \lt {0.01}$ $T s < 0.01$
Lenses	${T} \gt {0.99}$ $T > 0.99$
Diffraction grating	${T} \gt {0.90}$ $T > 0.90$

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