物理学报
物理學報
물이학보
2013年
8期
083202-1-083202-6
,共1页
中红外飞秒光脉冲%晶体%高次谐波%截止频率
中紅外飛秒光脈遲%晶體%高次諧波%截止頻率
중홍외비초광맥충%정체%고차해파%절지빈솔
mid-infrared femtosecond pulses%crystal%high order harmonic generation%cutoff frequency
通过数值求解中红外飞秒光脉冲与一维单电子多阱势相互作用的含时薛定谔方程,研究了晶体环境下的高次谐波发射光谱,发现了晶体谐波谱的截止位置公式.研究发现,不同于气体环境下的谐波谱截止频率规律,晶体谐波谱的截止频率与激光电场的峰值振幅及晶格参数成线性关系.鉴于准经典力学的三步模型对于气体谐波截止频率的解释,进一步采用准经典力学方法验证了晶体谐波截止位置规律的正确性.
通過數值求解中紅外飛秒光脈遲與一維單電子多阱勢相互作用的含時薛定諤方程,研究瞭晶體環境下的高次諧波髮射光譜,髮現瞭晶體諧波譜的截止位置公式.研究髮現,不同于氣體環境下的諧波譜截止頻率規律,晶體諧波譜的截止頻率與激光電場的峰值振幅及晶格參數成線性關繫.鑒于準經典力學的三步模型對于氣體諧波截止頻率的解釋,進一步採用準經典力學方法驗證瞭晶體諧波截止位置規律的正確性.
통과수치구해중홍외비초광맥충여일유단전자다정세상호작용적함시설정악방정,연구료정체배경하적고차해파발사광보,발현료정체해파보적절지위치공식.연구발현,불동우기체배경하적해파보절지빈솔규률,정체해파보적절지빈솔여격광전장적봉치진폭급정격삼수성선성관계.감우준경전역학적삼보모형대우기체해파절지빈솔적해석,진일보채용준경전역학방법험증료정체해파절지위치규률적정학성.
@@@@By numerically solving the time-dependent Schr¨odinger equation with the interaction between one-dimensional multi-well po-tential and the mid-infrared few-cycle femtosecond pulses, we theoretically investigate the high-order harmonic generation spectra in a crystal, further find the cutoff frequency formula under the new condition. Our results clearly show that the high order harmonic generation in the crystal is fundamentally different from that in the atomic case, owing to the high density and periodic structure. The harmonics spectrum shows a cutoff position that scales linearly with the peak amplitude of electric field of the drive laser and the lattice parameters. Based on the important role of the three-step model obtained by quasi-calssical mechanics method in gas harmonic generation, in this paper, this method is also well used to verify the cutoff position law in crystal harmonic generation.
