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

Li, Xiaofeng; Li, Bo LU ; Liu, Jixu; Zhu, Zhifeng; Zhang, Dayuan; Tian, Yifu; Gao, Qiang LU and Li, Zhongshan LU (2019) In Optics Express 27(4). p.5755-5763
Abstract


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

... (More)


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.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Express
volume
27
issue
4
pages
9 pages
publisher
OSA
external identifiers
  • scopus:85062807409
ISSN
1094-4087
DOI
10.1364/OE.27.005755
language
English
LU publication?
yes
id
353b110b-d62e-4198-997f-7479175f3cc0
date added to LUP
2019-03-19 10:59:07
date last changed
2019-04-23 04:46:56
@article{353b110b-d62e-4198-997f-7479175f3cc0,
  abstract     = {<p><br>
                                                         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                             <br>
                            <sub>2</sub><br>
                                                                                      <br>
                            <sup>+</sup><br>
                                                         (B                             <br>
                            <sup>2</sup><br>
                                                         Σ                             <br>
                            <sub>u</sub><br>
                                                                                      <br>
                            <sup>+</sup><br>
                                                          - X                             <br>
                            <sup>2</sup><br>
                                                         Σ                             <br>
                            <sub>g</sub><br>
                                                                                      <br>
                            <sup>+</sup><br>
                                                         ), N                             <br>
                            <sub>2</sub><br>
                                                         (B                             <br>
                            <sup>3</sup><br>
                                                         Π                             <br>
                            <sub>g</sub><br>
                                                          - A                             <br>
                            <sup>3</sup><br>
                                                         Σ                             <br>
                            <sub>u</sub><br>
                                                                                      <br>
                            <sup>+</sup><br>
                                                         ) and N                             <br>
                            <sub>2</sub><br>
                                                         (C                             <br>
                            <sup>3</sup><br>
                                                         Π                             <br>
                            <sub>u</sub><br>
                                                          - B                             <br>
                            <sup>3</sup><br>
                                                         Π                             <br>
                            <sub>g</sub><br>
                                                         ). However, it had little effect on the long-lifetime chemiluminescence, which mainly comes from reactions such as N                             <br>
                            <sub>2</sub><br>
                                                         (A                             <br>
                            <sup>3</sup><br>
                                                         Σ                             <br>
                            <sub>u</sub><br>
                                                                                      <br>
                            <sup>+</sup><br>
                                                         ) + N                             <br>
                            <sub>2</sub><br>
                                                         (A                             <br>
                            <sup>3</sup><br>
                                                         Σ                             <br>
                            <sub>u</sub><br>
                                                                                      <br>
                            <sup>+</sup><br>
                                                         ) → N                             <br>
                            <sub>2</sub><br>
                                                         (X                             <br>
                            <sup>1</sup><br>
                                                         Σ                             <br>
                            <sub>g</sub><br>
                                                                                      <br>
                            <sup>+</sup><br>
                                                         , v = 0) + N                             <br>
                            <sub>2</sub><br>
                                                         (B                             <br>
                            <sup>3</sup><br>
                                                         Π                             <br>
                            <sub>g</sub><br>
                                                         ). 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.                         <br>
                        </p>},
  author       = {Li, Xiaofeng and Li, Bo and Liu, Jixu and Zhu, Zhifeng and Zhang, Dayuan and Tian, Yifu and Gao, Qiang and Li, Zhongshan},
  issn         = {1094-4087},
  language     = {eng},
  number       = {4},
  pages        = {5755--5763},
  publisher    = {OSA},
  series       = {Optics Express},
  title        = {Enhancement of femtosecond laser-induced plasma fluorescence using a nanosecond laser},
  url          = {http://dx.doi.org/10.1364/OE.27.005755},
  volume       = {27},
  year         = {2019},
}