原子与分子物理学报
原子與分子物理學報
원자여분자물이학보
CHINESE JOURNAL OF ATOMIC AND MOLECULAR PHYSICS
2015年
4期
616-620
,共5页
高次谐波%阿秒脉冲%紫外光源
高次諧波%阿秒脈遲%紫外光源
고차해파%아초맥충%자외광원
High-order harmonic generation ( HHG)%Attosecond pulse%Ultraviolet source
本文理论提出了一种利用超短紫外光源来增强阿秒脉冲强度的方法。计算结果表明，当适当的加入一束62 nm或者125 nm超短紫外光源到双色激光场时，不仅高次谐波的截止能量被延伸了，而且谐波的强度也比原双色场时有明显的增强。尤其是当采用125 nm光源时，谐波的强度被增强了2个数量级，并且形成了一个232 eV的超长平台区。最后通过叠加谐波次数从113次到170次可获得脉宽仅为43 as的孤立阿秒脉冲，其强度比原双色场情况下产生的阿秒脉冲增强了2个数量级。
本文理論提齣瞭一種利用超短紫外光源來增彊阿秒脈遲彊度的方法。計算結果錶明，噹適噹的加入一束62 nm或者125 nm超短紫外光源到雙色激光場時，不僅高次諧波的截止能量被延伸瞭，而且諧波的彊度也比原雙色場時有明顯的增彊。尤其是噹採用125 nm光源時，諧波的彊度被增彊瞭2箇數量級，併且形成瞭一箇232 eV的超長平檯區。最後通過疊加諧波次數從113次到170次可穫得脈寬僅為43 as的孤立阿秒脈遲，其彊度比原雙色場情況下產生的阿秒脈遲增彊瞭2箇數量級。
본문이론제출료일충이용초단자외광원래증강아초맥충강도적방법。계산결과표명，당괄당적가입일속62 nm혹자125 nm초단자외광원도쌍색격광장시，불부고차해파적절지능량피연신료，이차해파적강도야비원쌍색장시유명현적증강。우기시당채용125 nm광원시，해파적강도피증강료2개수량급，병차형성료일개232 eV적초장평태구。최후통과첩가해파차수종113차도170차가획득맥관부위43 as적고립아초맥충，기강도비원쌍색장정황하산생적아초맥충증강료2개수량급。
A promising method to improve the attosecond pulse intensity has been theoretically presented with the assisted of an ultrashort ultraviolet pulse.It shows that by properly adding an ultrashort 62 nm or 125 nm ultravi-olet pulse to the synthesized two-color field, not only the harmonic cutoff but also the harmonic yield are re-markably enhanced compared with the original two-color field case.Especially for adding the 125 nm pulse case, the harmonic yield is enhanced by 2 orders of magnitude, and an ultrabroad 232 eV bandwidth is ob-tained.Finally, by superposing harmonics from the 113th to the 170th, an intense isolated pulse as short as 43 as can be directly produced, which is 2 orders of magnitude higher than the case of generation from the original two-color field.
