实验研究宽频带脉冲光束通过非线性介质时的非线性热像的形成过程,揭示了光束入射功率和脉冲宽度、介质厚度等因素对热像光强和位置的影响.结果表明,与单纵模激光束一样,在宽频带脉冲光束情形下,非线性介质上游元件的模糊斑调制也可导致在下游共轭位置形成热像.热像光强随入射光束功率的增加而增加;若脉冲能量一定,则热像光强随脉冲宽度的增加而减弱;若脉冲峰值功率一定,则热像光强随脉冲宽度的增加而增强. The influence of the incident power, pulse width, dielectric thickness and other factors on the intensity and position of thermal image is revealed experimentally. The results show that, compared with the single-longitudinal mode Like a laser beam, in the case of a broad band pulsed beam, the modulation of the blurring of the components upstream of the nonlinear medium can also lead to the formation of a thermal image at the downstream conjugate position. The intensity of the thermal image increases with the power of the incident beam; , The intensity of thermal image weakens with the increase of pulse width. If the pulse peak power is constant, the intensity of thermal image increases with the increase of pulse width.