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首次采用飞秒超短脉冲激光(≤35 fs),研究其对硅太阳能电池的损伤阈值。与相同波长的连续激光对比,飞秒激光的损伤阈值略高。这一结果不同于纳秒或皮秒激光,主要是因为当加热脉冲时间相当或小于电子-声子耦合时间时,非热平衡效应显著,热传导现象不再满足Fourier定律。在实验中采用了光束整形技术,首次采用强度均匀分布的激光研究损伤阈值。此技术能减小高斯激光中心光强过大造成的实验偏差。
The femtosecond ultra-short pulse laser (≤35 fs) was used for the first time to study the damage threshold of silicon solar cells. Compared with continuous lasers of the same wavelength, the damage threshold of femtosecond laser is slightly higher. This result is different from nanosecond or picosecond lasers, mainly because the nonthermal equilibrium effect is significant when the heating pulse time is quite or less than the electron-phonon coupling time, and the thermal conduction no longer satisfies Fourier’s law. In the experiment, the beam shaping technique was used. The damage threshold was first studied by the laser with uniform intensity distribution. This technique can reduce experimental deviations caused by excessive light intensity at Gaussian laser center.