A high-resolution, adaptive beam-shaping system for high-power lasers

A new, versatile Thomson parabola ion energy (TPIE) analyzer has been designed, constructed, and used at the OMEGA-EP facility. Laser-accelerated multi-MeV ions from hemispherical C targets are transmitted through a W pinhole into a multi-kG magnetic field and subsequently through a parallel electric field of up to 25 kV/cm. The ion drift region has a user-selected length of 10, 50, or 80 cm. With the highest fields, 400-MeV C(6+) and C(5+) may be resolved. TPIE is ten-inch manipulator (TIM)-mounted at OMEGA-EP and can be used opposite either of the EP ps beams. The instrument runs on pressure-interlocked 15-Vdc power available in EP TIM carts. Flux control derives from the insertion depth into the target chamber and the user-selected pinhole dimensions. The detector consists of CR39 backed by an image plate. A fully relativistic simulation code for calculating ion trajectories was employed for design optimization. Excellent agreement of code predictions with the actual ion positions on the detectors is observed. Through pit counting of carbon-ion tracks in CR39, it is shown that conversion efficiency of laser light to energetic carbon ions exceeds ~5% for these targets.

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“…Work is underway to improve this situation. 22 From Fig. 3, one may make general observations concerning the abundance of various ions.…”

Section: A Carbon Spectrummentioning

confidence: 99%

High-resolution Thomson parabola for ion analysis

Cobble

Flippo

Offermann

et al. 2011

Review of Scientific Instruments

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“…Some devices have recently been employed for wavefront correction in high-power laser systems, and include stimulated Brillouin scattering phase conjugation mirrors (SBS-PCMs) [18][19][20][21][22], a liquid-crystal spatial light modulator (SLM) [23], and a deformable mirror (DM) [24][25][26]. Using SBS-PCMs is a passive method for wavefront shaping, and they are used as cavity end mirrors 2 of 9 that can only compensate the wavefront aberration of the elements in a double-pass structure.…”

Section: Introductionmentioning

confidence: 99%

Wavefront Shaping by a Small-Aperture Deformable Mirror in the Front Stage for High-Power Laser Systems

Zhou

Cui

et al. 2017

Applied Sciences

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Abstract:We demonstrate a method for wavefront distribution compensation with a low-cost small-aperture deformable mirror in the front stage of a complex high-power solid-state laser system. Meanwhile, an iterative algorithm for improving wavefront quality is indicated. Using this method, the wavefront compensation was studied in our single-shot high-power laser system that operated with and without the main amplifiers, respectively. The wavefront was compensated effectively, showing the near-flopped-shape output with the peak-to-valley value of 0.29 λ and root meam square (RMS) of 0.06 λ at 1053 nm.

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“…One of the first successful applications of the AO technique was in astronomy [1,2] to compensate wavefront aberrations induced by atmospheric turbulence. Nowdays, AO technique is used in the fields of microscopy [3,4], ophthalmology [5], tomography [6], laser beam shaping [7], optical communication [8], and more recently in lithography [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Iterative learning control of a membrane deformable mirror for optimal wavefront correction

et al. 2013

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We present an iterative learning control (ILC) algorithm for controlling the shape of a membrane deformable mirror (DM). We furthermore give a physical interpretation of the design parameters of the ILC algorithm. On the basis of this insight, we derive a simple tuning procedure for the ILC algorithm that, in practice, guarantees stable and fast convergence of the membrane to the desired shape. In order to demonstrate the performance of the algorithm, we have built an experimental setup that consists of a commercial membrane DM, a wavefront sensor, and a real-time controller. The experimental results show that, by using the ILC algorithm, we are able to achieve a relatively small error between the real and desired shape of the DM while at the same time we are able to control the saturation of the actuators. Moreover, we show that the ILC algorithm outperforms other control algorithms available in the literature.

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A high-resolution, adaptive beam-shaping system for high-power lasers

Cited by 51 publications

References 18 publications

High-resolution Thomson parabola for ion analysis

High-resolution Thomson parabola for ion analysis

Wavefront Shaping by a Small-Aperture Deformable Mirror in the Front Stage for High-Power Laser Systems

Iterative learning control of a membrane deformable mirror for optimal wavefront correction

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