Final optics design for the megajoule laser

Adolf, Alain; Boscheron, A.; Dulac, A.; Journot, Eric

doi:10.1117/12.354239

Cited by 15 publications

(6 citation statements)

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“…This polarization was retained for conversion frequency considerations. 7 The basic geometric law of diffraction grating relates the incident ͑i 1 ͒ and diffraction ͑i p ͒ angles with the wavelength () and period of the grating (⌳) [see Fig. 2 and Eq.…”

Section: Design Of the 1 And 3 Gratingsmentioning

confidence: 99%

“…Moreover, since the laser is used in broad spectral bandwidth for beam-smoothing purposes, 6 dispersion of the 1 grating enhances the KDP conversion yield because the phase-matching angle of each wavelength on the KDP crystals is adapted. 7 Another advantage of the diffractive method is due to the holographic nature of the 3 grating. By construction, this grating features a focused reflected order that can be used for laser line focal spot diagnostic.…”

Section: Introductionmentioning

confidence: 99%

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Design, optical characterization, and operation of large transmission gratings for the laser integration line and laser megajoule facilities

Néauport¹,

Journot²,

Gaborit³

et al. 2005

Appl. Opt.

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Within the framework of the laser integration line (LIL) and the laser megajoule, we describe the design, optical characterization, mounting, alignment, and operation on the LIL of large 420 mm x 470 mm transmission gratings. Two types of grating were manufactured. The first, operating at a wavelength of 1.053 microm, was used for deviation purposes. The second, operating at a wavelength of 0.351 microm, was used for both deviation and focusing purposes. We demonstrate that these large transmission gratings are suitable for nanosecond-regime operation on high-power laser facilities.

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Section: Design Of the 1 And 3 Gratingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design, optical characterization, and operation of large transmission gratings for the laser integration line and laser megajoule facilities

Néauport¹,

Journot²,

Gaborit³

et al. 2005

Appl. Opt.

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“…Figure 1 shows the final optics design of the LIL and the LMJ. 6 A broad spectrum is generated by a sinusoidal phase modulator placed in the front end of the laser. After frequency conversion, the 0.351-m converted light is focused by the 3 grating lens 7,8 onto the target.…”

Section: Design and Optical Characterization Of A Large Continuous Phmentioning

confidence: 99%

Design and optical characterization of a large continuous phase plate for Laser Integration Line and laser Megajoule facilities

et al. 2003

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For development of the French Laser Integration Line and the Laser Megajoule, we describe the design and the control of a first 383 mm x 398 mm continuous phase-plate prototype. Extensively used in laser fusion facilities for beam smoothing, this optical component was manufactured by deep etching onto a fused-silica substrate, which led to a phase plate engraved directly onto fused silica, with which good optical performance could be achieved. We demonstrate good agreement between the desired simulated component and the manufactured component in terms of focal spot shape. This demonstration was performed by both interferometric and photometric measurements.

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“…The LIL and LMJ baselines have been widely detailed in previous publications 1,2 . We remind that the laser is divided into main subassemblies : front-end, amplifying section, transport, frequency conversion and focusing system (FCFS).…”

Section: Introductionmentioning

confidence: 99%

Diffraction gratings production for LIL high-power laser: an overview

Néauport

Flamand²,

Josserand³

et al. 2004

SPIE Proceedings

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Unlike other drive fusion class laser, Megajoule laser (LMJ) and its first prototype, the Laser Integration Line (LIL) are equipped with specific diffractive optical components. All these optics are situated in the final optic assembly.A high efficiency diffraction focusing grating called 3w grating is used to focus the beam into the center of the target chamber instead of a classical focusing lens. Another large grating called 1w grating is used for optical path compensation purposes. Both components have a dimension of 420x470mm² and are working at an incidence of 25°. They are plano transmission holographic gratings directly engraved into fused silica substrates. The 1w grating is working at the wavelength of 1.053µm, its grooves are straight and equispaced. The 3w grating is a focusing grating working at the wavelength of 0.351µm. Its grooves are curved and non equispaced.Jobin Yvon was selected by CEA to manufacture these two types of diffraction gratings. After process developments and facilitization, a complete batch of twelve 1w gratings and ten 3w gratings were delivered to CEA for integration.After a brief presentation of CEA's specification for this diffractive optics, we give some details on the manufacturing processes. We also demonstrate good agreement between specified and manufactured component. We give an overview of the global production performances

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Final optics design for the megajoule laser

Cited by 15 publications

References 0 publications

Design, optical characterization, and operation of large transmission gratings for the laser integration line and laser megajoule facilities

Design, optical characterization, and operation of large transmission gratings for the laser integration line and laser megajoule facilities

Design and optical characterization of a large continuous phase plate for Laser Integration Line and laser Megajoule facilities

Diffraction gratings production for LIL high-power laser: an overview

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