Ultrafast gain dynamics in N_2^+ lasing from highly excited vibrational states pumped by circularly polarized femtosecond laser pulses

作     者：翟凯旋 李紫婷 谢红强 井晨睿 李贵花 曾斌 储蔚 倪洁蕾 姚金平 程亚 

作者机构：State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences University of Chinese Academy of Sciences School of Physics Science and Engineering Tongji University 

出 版 物：《Chinese Optics Letters》 (中国光学快报（英文版）)

年 卷 期：2015年第13卷第5期

页      面：1-5页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：supported by the National Basic Research Program of China(Grant Nos.2011CB808102 and 2014CB921300) the National Natural Science Foundation of China(Grant Nos.11134010,11204332,and11304330) the Program of Shanghai Subject Chief Scientist(Grant No.11XD1405500) 

主　　题：Circular polarization Excited states Laser pulses Optical pumping Pumping (laser) Ultrafast lasers 

摘      要：We experimentally demonstrate N2^＋ lasing actions at the wavelengths of 353.3, 353.8, and 354.9 nm using a circularly polarized femtosecond laser. The three laser lines correspond to the B2∑u^＋（v＇ = 5, 4, 3） → X2∑g^＋（v = 4, 3, 2） transitions, respectively. Particularly, we reveal the pressure-dependent gain dynamics of these lasing actions from highly excited vibrational states with a pump-probe scheme. Our experimental results confirm that electron eollisional excitation plays an important role in the establishment of a population inversion of N2^＋ lasing at these wavelengths.