光谱学与光谱分析 |
|
|
|
|
|
Third Harmonic Enhancement and Spectral Analysis within Plasma Channel Based on Pump-Probe Effect |
WANG Yan-ling, WU Hong, DING Liang-en* |
State Key Laboratory of Precision Spectroscopy and Department of Physics, East China Normal University, Shanghai 200062, China |
|
|
Abstract The experiment realized third harmonic enhancement by using non-collinear dual plasma channels based on pump-probe effect. The coupling action between pump and probe beams can improve saturation effect within filament and overcome the limitation of harmonic enhancement due to intensity clamping. By non-collinearly focusing two ultrafast pulses in air which have respectively a single pulse energy of 4.4 and 10.2 mJ, both with duration of 60fs and central wavelength of 810 nm, dual filaments as well as weak third harmonics can be generated. When strong beam is ahead of weak one, the former induces a plasma channel in advance which can modulate later weak beam and make obvious harmonic increase produced by probe beam. It was found that oscillation variation of spectral bandwidth in the region of harmonic energy increased significantly. When two beams intersect in a small angle of 27.3 mrad about 15 mm before geometric focus and the probe beam lags behind about 55 fs, the energy increase rate nearly reaches 70, and the corresponding spectral bandwidth is approximately 5 nm.
|
Received: 2009-09-02
Accepted: 2009-12-06
|
|
Corresponding Authors:
DING Liang-en
E-mail: leding@phy.ecnu.edu.cn
|
|
[1] LI Hai-ning, ZHANG Li-ping, WU Hong, et al(李海宁, 张丽平, 吴 洪, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2008, 28(6): 1201. [2] Kuo C, Pai C H, Lin M W, et al. Phy. Rev. Lett., 2007, 98(3): 033901. [3] Shim B, Hays G, Zgadzaj R, et al. Phys. Rev. Lett., 2007, 98(12): 123902. [4] Banks P S, Feit M D, Perry M D. J. Opt. Soc. Am. B , 2002, 19(1): 102. [5] Trushin S A, Panja S, Kosma K, et al. Appl. Phys. B, 2005, 80(4): 399. [6] Théberge F, Akzbek N, Liu W, et al. Opt. Comm., 2005, 245(1-6): 399. [7] Kolesik M, Wright E M, Becker A, et al. Appl. Phys. B, 2006, 85(4): 531. [8] Klaus Hartinger, Randy A Bartels. Appl. Phys. Lett., 2008, 93(15): 151102. [9] Ladouceur H D, Baronavski A P, Lohrmann D, et al. Opt. Commun., 2001, 189(1-3): 107. [10] Chin S L, Hosseini S A, Liu W, et al. Can. J. Phys., 2005, 83: 863. [11] Kolesik M, Wright E M, Becker A, et al. Appl. Phys. B, 2006, 85(4): 531. [12] Bergé L, Skupin S, Méjean G, et al. Phys. Rev. E, 2005, 71(1): 016602.
|
[1] |
HOU Xue-shun1, WANG Ying-wei1, WANG Dao-wei1, XIAO Si1, HE Jun1*, GU Bing2*. The Variable Nonlinear Absorption and Carrier Dynamics in GaN Thin Film under the Excitation of Femtosecond Pulses at Ultraviolet Wavelength[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(12): 3781-3785. |
[2] |
LI Hai-ning,ZHANG Li-ping,WU Hong,LI Xian,DING Liang-en*. Study on Spectral Characteristics of Third-Order Harmonic Emission of Plasma Channels in Atmosphere[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(06): 1201-1204. |
[3] |
LI Dan1,YANG He-qing2,LIANG Chun-jun1,QIAN Shi-xiong3 . Transient Dynamics of Excited States and Nonlinear Optical Properties of InP Nanoparticles [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2006, 26(09): 1742-1745. |
[4] |
ZHANG Hui1, PENG Yue-xiang2, ZANG Er-jun3 . Studies on the Hyperfine Structures of I2 Absorption Line with Third Harmonic Frequency Stabilization in Nd:YVO4-KTP Ring Laser [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(05): 641-643. |
|
|
|
|