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在飞秒脉冲激光的驱动下 ,使用泵浦 -探测技术测量了复合薄膜 Au- Ba- O的瞬态光学透过率随延迟时间的变化曲线 ,观察到了薄膜对光的吸收迅速增大并在皮秒时间内恢复原状的现象。该现象是薄膜中 Au超微粒子内费米能级附近电子被飞秒激光脉冲激发 ,产生非平衡态电子而经历瞬态弛豫造成的。从理论上给出了复合薄膜中 Au超微粒子的电子声子相互作用常数 g的数值
Driven by the femtosecond pulsed laser, the transient optical transmittance of composite film Au-Ba-O with the delay time curve was measured by using the pump-probe technique. It was observed that the absorption of light by the film increased rapidly and Picoseconds to restore the status quo ancestral phenomenon. This phenomenon is caused by the fact that the electrons near the Fermi level in Au ultrafine particles in the film are excited by femtosecond laser pulses to generate non-equilibrium electrons and undergo transient relaxation. The numerical value of the electron-phonon interaction constant g of the Au ultrafine particles in the composite film is given theoretically