Sun Mingguo, Ma Hongliang, Wang Guishi, Wang Lei, Cao Zhensong, Liang Wanguo, Chen Huaixi, Zhou Huang, Zou Xiaolin, Chen Weidong, Gao Xiaoming. Frequency Stabilization of Mid-Infrared Difference Frequency Laser by Iodine Molecule Absorption[J]. Chinese Journal of Lasers, 2014, 41(7): 702006