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在超强脉冲激光与固体靶相互作用中,利用光学CCD相机和光学多道分析仪(OMA),分别在固体薄膜靶背表面法线方向测量了光辐射积分成像图案和光谱。测量结果显示,光辐射空间分布图案呈圆环状,而辐射区域有发散角、有光强分布,包含多种辐射成分;光辐射光谱在800nm附近出现尖峰,是激光的基频(ω0)波,这一现象归因于超热电子束在输运的过程中产生的微束团而引起的相干渡越辐射(CTR);如果考虑超热电子的产生和加热机制,共振吸收和真空加热对超热电子都有贡献,其中占主导地位的加热机制则是共振吸收对电子的加热。
In the interaction between the super-pulsed laser and the solid target, the optical radiation integral imaging pattern and the spectrum were measured in the normal direction of the target surface of the solid film using an optical CCD camera and an optical multiplex analyzer (OMA). The measurement results show that the spatial pattern of optical radiation is annular, while the radiation area has divergent angle with light intensity distribution and contains a variety of radiation components. The optical radiation spectrum peaks around 800 nm and is the fundamental frequency (ω0) of the laser , This phenomenon is due to the coherent transition radiation (CTR) caused by the micro-bunches generated during the transport of the superheated electron beam. Considering the generation and heating mechanism of the superheated electrons, the resonance absorption and the vacuum heating Superheated electrons have contributed, including the dominant heating mechanism is resonant absorption of electronic heating.