Backward lasing of singly ionized nitrogen ions pumped by femtosecond laser pulses

Xiang Zhang, Rostyslav Danylo, Zhengquan Fan, Pengji Ding, Chenhao Kou, Qingqing Liang, Aurélien Houard, Vladimir Tikhonchuk, André Mysyrowicz, Yi Liu

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

Sammanfattning

We report on the observation of backward lasing at 391.4 nm of nitrogen ions pumped by linearly polarized intense femtosecond pulses at 800 nm. The strongly enhanced spectral intensity at 391.4 nm, as well as the amplification of an externally injected backward seeding pulse, confirm that the backward 391.4 nm signal is due to optical amplification in the nitrogen gas plasma. Compared to the forward emission at 391.4 nm, the optimal backward emission is achieved at a lower gas pressure around 10 mbar, which is due to asymmetry of the backward and forward directions rooted in the traveling excitation geometry. Comparison of the signals in pure nitrogen and air revealed a strong quenching effect of the oxygen molecules, preventing backward lasing action in ambient air.

Originalspråkengelska
Artikelnummer53
TidskriftApplied Physics B: Lasers and Optics
Volym126
Nummer3
DOI
StatusPublished - 2020 mars 2

Ämnesklassifikation (UKÄ)

  • Atom- och molekylfysik och optik

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