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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