利用谐波光谱的伴线结构测量自生磁场

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Abstract The satellites structures of doubling harmonic spectrum and tripling harmonic spectrum were measured at the reflection direction of laser wave from the front side of targets, employing OMA optical multi-channel spectrometer during the interactions of femtosecond laser with solid targets. The satellites structures of red-shift harmonic spectrum of 2ω₀ and 3ω₀ were observed. Under the intensity of ～10¹⁸ W·cm^-2, the result of measurement indicates that the spontaneous magnetic field was all less than 1 MGs level by analyzing the satellites structures of doubling harmonic spectrum and tripling harmonic spectrum during the laser-plasma interaction. With increasing the intensity of the laser pulse, the peak of the red-shift moves further to the long wavelength side causing the broadening of the spectrum. The measurements of the spontaneous magnetic field provide a basis of diagnosing the movement of the critical surface in the laser-plasma interaction process.

Key words：Femtosecond laser;Harmonic spectrum;Satellites structures;Spontaneous magnetic field;Red-shift

Received: 2006-09-28 Accepted: 2006-12-26

ZTFLH:

O434.1

Corresponding Authors: WANG Guang-chang E-mail: wgchang@tom.com

Cite this article:

WANG Guang-chang,CHEN Tao,ZHANG Ting, et al. A Measurement of Spontaneous Magnetic Field by Satellites Structures of Harmonic Spectrum[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(10): 1917-1920.

URL:

https://www.gpxygpfx.com/EN/Y2007/V27/I10/1917

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