Measurement of femtosecond laser-driven X-ray focal spot with repetition frequency

Wang Hongjian; Yang Qingguo; Ye Yan; Li Jun; Meng Limin; Yu Yong; Wang Hairong; Mu Jian; Peng Qixian; Li Ze’ren

doi:10.11884/HPLPB201527.032039

Volume 27 Issue 03

Mar. 2015

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Wang Hongjian, Yang Qingguo, Ye Yan, et al. Measurement of femtosecond laser-driven X-ray focal spot with repetition frequency[J]. High Power Laser and Particle Beams, 2015, 27: 032039. doi: 10.11884/HPLPB201527.032039

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Wang Hongjian, Yang Qingguo, Ye Yan, et al. Measurement of femtosecond laser-driven X-ray focal spot with repetition frequency[J]. High Power Laser and Particle Beams, 2015, 27: 032039. doi: 10.11884/HPLPB201527.032039

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Measurement of femtosecond laser-driven X-ray focal spot with repetition frequency

doi: 10.11884/HPLPB201527.032039

1.
Chongqing Engineering Technology Research Center for Information Management in Development,Chongqing Key Laboratory of Manufacturing Equipment Mechanism Design and Control,Chongqing Technology and Business University,Chongqing 400067,China;
2.
Institute of Fluid Physics,CAEP,Mianyang 621900,China

Received Date: 2014-10-16
Rev Recd Date: 2014-12-04
Publish Date: 2015-02-10

Abstract

Abstract

In order to obtain focal spot size and spatial resolution of X-ray driven by the ultra-intense laser, a new method was designed to diagnose with a 0.2-m-thick knife-edge attached two different meshes, one copper mesh of 400 meshes and another nickel of 394 line pairs per centimeter. The X-ray was obtained by X-ray CCD. Tisapphire laser (1 J/40 fs/10 Hz) with an intensity of approximately 4.41018 W/cm2 shot the disc Cu target by repetition frequency. The experiment was carried out successfully on a 25 TW laser device at CAEP, in which the first focal spot and the X-ray image of the meshes were both obtained. The estimated focal spot of the X-ray was 43 m, and the estimated spatial resolution was 34 m. The results showed that the method of knife-edge and two meshes was suitable for the measurement of focal spot size of X-ray driven by ultra-intense laser.
- laser interaction with matter,
- repetition frequency,
- knife-edge method,
- spatial resolution

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