Enhancement of femtosecond laser-induced plasma fluorescence using a nanosecond laser

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Enhancement of femtosecond laser-induced plasma fluorescence using a nanosecond laser. / Li, Xiaofeng; Li, Bo; Liu, Jixu; Zhu, Zhifeng; Zhang, Dayuan; Tian, Yifu; Gao, Qiang; Li, Zhongshan.

In: Optics Express, Vol. 27, No. 4, 2019, p. 5755-5763.

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Li, X, Li, B, Liu, J, Zhu, Z, Zhang, D, Tian, Y, Gao, Q & Li, Z 2019, 'Enhancement of femtosecond laser-induced plasma fluorescence using a nanosecond laser', Optics Express, vol. 27, no. 4, pp. 5755-5763. https://doi.org/10.1364/OE.27.005755

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Li, Xiaofeng ; Li, Bo ; Liu, Jixu ; Zhu, Zhifeng ; Zhang, Dayuan ; Tian, Yifu ; Gao, Qiang ; Li, Zhongshan. / Enhancement of femtosecond laser-induced plasma fluorescence using a nanosecond laser. In: Optics Express. 2019 ; Vol. 27, No. 4. pp. 5755-5763.

RIS

TY - JOUR

T1 - Enhancement of femtosecond laser-induced plasma fluorescence using a nanosecond laser

AU - Li, Xiaofeng

AU - Li, Bo

AU - Liu, Jixu

AU - Zhu, Zhifeng

AU - Zhang, Dayuan

AU - Tian, Yifu

AU - Gao, Qiang

AU - Li, Zhongshan

PY - 2019

Y1 - 2019

N2 - We demonstrate the enhancement of femtosecond (fs) laser-induced filaments in air and nitrogen flow fields using a nanosecond (ns) laser. With the ns laser being imposed on the filaments, the length and the emission intensity of the filaments were largely increased. Temporally resolved spectra of the enhanced filaments were obtained. The results show that the ns laser enhanced the short-lifetime fluorescence of nitrogen, which comes from the transition processes of N 2 + (B 2 Σ u + - X 2 Σ g + ), N 2 (B 3 Π g - A 3 Σ u + ) and N 2 (C 3 Π u - B 3 Π g ). However, it had little effect on the long-lifetime chemiluminescence, which mainly comes from reactions such as N 2 (A 3 Σ u + ) + N 2 (A 3 Σ u + ) → N 2 (X 1 Σ g + , v = 0) + N 2 (B 3 Π g ). A possible explanation of this phenomenon is given, and this phenomenon might have potential applications in instantaneous one-dimensional measurements of various species in gas flow fields.

AB - We demonstrate the enhancement of femtosecond (fs) laser-induced filaments in air and nitrogen flow fields using a nanosecond (ns) laser. With the ns laser being imposed on the filaments, the length and the emission intensity of the filaments were largely increased. Temporally resolved spectra of the enhanced filaments were obtained. The results show that the ns laser enhanced the short-lifetime fluorescence of nitrogen, which comes from the transition processes of N 2 + (B 2 Σ u + - X 2 Σ g + ), N 2 (B 3 Π g - A 3 Σ u + ) and N 2 (C 3 Π u - B 3 Π g ). However, it had little effect on the long-lifetime chemiluminescence, which mainly comes from reactions such as N 2 (A 3 Σ u + ) + N 2 (A 3 Σ u + ) → N 2 (X 1 Σ g + , v = 0) + N 2 (B 3 Π g ). A possible explanation of this phenomenon is given, and this phenomenon might have potential applications in instantaneous one-dimensional measurements of various species in gas flow fields.

U2 - 10.1364/OE.27.005755

DO - 10.1364/OE.27.005755

M3 - Article

VL - 27

SP - 5755

EP - 5763

JO - Optics Express

T2 - Optics Express

JF - Optics Express

SN - 1094-4087

IS - 4

ER -