A Measurement of Spontaneous Magnetic Field by Satellites Structures of Harmonic Spectrum
WANG Guang-chang1,2, CHEN Tao1, ZHANG Ting1, DENG Li1, ZHENG Zhi-jian2
1. Teaching and Research Section of Physics, Chengdu Medical College, Chengdu 610083, China 2. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
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
王光昶1,2, 陈涛1, 张婷1,邓利1,郑志坚2 . 利用谐波光谱的伴线结构测量自生磁场[J]. 光谱学与光谱分析, 2007, 27(10): 1917-1920.
WANG Guang-chang1,2, CHEN Tao1, ZHANG Ting1, DENG Li1, ZHENG Zhi-jian2 . A Measurement of Spontaneous Magnetic Field by Satellites Structures of Harmonic Spectrum. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(10): 1917-1920.
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