红外与激光工程
紅外與激光工程
홍외여격광공정
INFRARED AND LASER ENGINEERING
2014年
3期
676-680
,共5页
田秀芹%肖思%陶少华%袁战忠%周炎强
田秀芹%肖思%陶少華%袁戰忠%週炎彊
전수근%초사%도소화%원전충%주염강
飞秒超短脉冲激光%太阳能电池%损伤阈值%光束整形
飛秒超短脈遲激光%太暘能電池%損傷閾值%光束整形
비초초단맥충격광%태양능전지%손상역치%광속정형
femtosecond laser with ultrashort pulse%silicon solar cells%damage threshold%beam shaping
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。
首次採用飛秒超短脈遲激光(≤35 fs),研究其對硅太暘能電池的損傷閾值。與相同波長的連續激光對比,飛秒激光的損傷閾值略高。這一結果不同于納秒或皮秒激光,主要是因為噹加熱脈遲時間相噹或小于電子-聲子耦閤時間時,非熱平衡效應顯著,熱傳導現象不再滿足Fourier定律。在實驗中採用瞭光束整形技術,首次採用彊度均勻分佈的激光研究損傷閾值。此技術能減小高斯激光中心光彊過大造成的實驗偏差。
수차채용비초초단맥충격광(≤35 fs),연구기대규태양능전지적손상역치。여상동파장적련속격광대비,비초격광적손상역치략고。저일결과불동우납초혹피초격광,주요시인위당가열맥충시간상당혹소우전자-성자우합시간시,비열평형효응현저,열전도현상불재만족Fourier정률。재실험중채용료광속정형기술,수차채용강도균균분포적격광연구손상역치。차기술능감소고사격광중심광강과대조성적실험편차。
Femtosecond laser with ultrashort pulse (≤35 fs) was first applied to investigate damage threshold of a monocrystalline silicon solar cell. Compared with a continuous-wave laser of the same central wavelength, a femtosecond laser pulse was found to have a slightly higher damage threshold. Unlike nanosecond or picosecond lasers, the femtosecond laser has heating pulse time equal to or shorter than the electron- phonon coupling time. Thus, the thermal non-equilibrium effect becomes obvious, and the heat conduction phenomenon no longer meets the law of Fourier. In the damage threshold experiments, a beam shaping technique was applied for a femtosecond laser to generate uniform intensity distribution, which could prevent experimental deviation caused by great concentrated intensity distribution of a conventional laser pulse with the Gaussian profile.