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Chin. Phys. B, 2017, Vol. 26(5): 054209    DOI: 10.1088/1674-1056/26/5/054209

Field-free molecular orientation enhanced by tuning the intensity ratio of a three-color laser field

Zhi-Yuan Huang(黄志远)1, Ding Wang(王丁)1, Lang Zheng(郑浪)2, Wen-Kai Li(黎文开)1, Rui-Rui Zhao(赵睿睿)1, Yu-Xin Leng(冷雨欣)1
1 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
2 Jiangxi Provincial Education Examination Authority, Nangchang 330038, China

We theoretically study the field-free molecular orientation induced by a three-color laser field. The three-color laser field with a large asymmetric degree can effectively enhance the molecular orientation. In particular, when the intensity ratio of the three-color laser field is tuned to a proper value of I3:I2:I1 = 0.09:0.5:1, the molecular orientation can be improved by ~ 20% compared with that of the two-color laser field at intensity ratio I2:I1 = 1:1 for the same total laser intensity of 2× 1013 W/cm2. Moreover, we investigate the effect of the carrier-envelope phase (CEP) on the molecular orientation and use the asymmetric degree of the laser field to explain the result. We also show the influences of the laser intensity, rotational temperature, and pulse duration on the molecular orientation. These results are meaningful for the theoretical and experimental studies on the molecular orientation.

Keywords:  molecular orientation      three-color laser field      carrier-envelope phase     
Received:  30 November 2016      Editor Suggest Published:  05 May 2017
PACS:  42.50.-p (Quantum optics)  
  33.80.-b (Photon interactions with molecules)  
  33.20.Sn (Rotational analysis)  

Project supported by the National Natural Science Foundation of China (Grant Nos. 61221064, 61078037, 11134010, 61205208, and 61521093), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB16), and the International S&T Cooperation Program of China (Grant No. 2016YFE0119300).

Corresponding Authors:  Yu-Xin Leng     E-mail:

Cite this article: 

Zhi-Yuan Huang, Ding Wang, Lang Zheng, Wen-Kai Li, Rui-Rui Zhao, Yu-Xin Leng Field-free molecular orientation enhanced by tuning the intensity ratio of a three-color laser field 2017 Chin. Phys. B 26 054209

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