论文信息 - Measurements of laser-hole boring into overdense plasmas using x-ray laser refractometry (invited)

Measurements of laser-hole boring into overdense plasmas using x-ray laser refractometry (invited)

We developed a 19.6 nm laser x-ray laser grid-image refractometer (XRL-GIR) to diagnose laser-hole boring into overdense plasmas. The XRL-GIR was optimized to measure two-dimensional electron density perturbation on a scale of a few tens of μm in underdense plasmas. Electron density profiles of laser-produced plasmas were obtained for 1020–1022 cm−3 with the XRL-GIR and for 1019–1020 cm−3 from an ultraviolet interferometer, the profiles of which were compared with those from hydrodynamic simulation. By using this XRL-GIR, we directly observed laser channeling into overdense plasmas accompanied by a bow shock wave showing a Mach cone ascribed to supersonic propagation of the channel front.

[1] D L Matthews,et al. Power measurements of a saturated yttrium x-ray laser. , 1993, Optics letters.

[2] Kodama,et al. Generation of small-divergence soft x-ray laser by plasma waveguiding with a curved target. , 1994, Physical review letters.

[3] Troy W. Barbee,et al. New plasma diagnostic possibilities from radiography with x.u.v. lasers , 1995 .

[4] K. Tanaka,et al. Study of laser channeling into an overdense plasma , 1997 .

[5] P. Young. Experimental study of filamentation in laser–plasma interactions , 1991 .

[6] Richard A. London,et al. Novel x-ray imaging methods at the Nova laser facility (invited) , 1995 .

[7] F. S. Turner,et al. Characterization of laser‐produced plasma density profiles using grid image refractometry , 1993 .

[8] Weber,et al. Electron Density Measurements of High Density Plasmas Using Soft X-Ray Laser Interferometry. , 1995, Physical review letters.

[9] O. Willi,et al. Electron-Density Structures in Laser-Produced Plasmas at High Irradiances , 1979 .

[10] Peter M. Celliers,et al. XUV laser grid image refractometry applied in laser hole boring experiments , 1997, Optics & Photonics.