Abstract—By using both the single-walled carbon nanotube saturable absorber (SWCNT-SA) and an acousto-optic (AO) modulator, the stably doubly Q-switched and mode-locked (QML) lasers with Nd-doped mixed vanadate crystals have been realized. The doubly QML laser characteristics are measured. The doubly Q-switching and mode-locking performances are found to be greatly improved by use of Nd:Gd_0.3Lu_0.33Y_0.37VO₄ incomparison to that achieved with Nd:YVO₄, Nd:LuVO₄, and Nd:Lu_0.2Y_0.8VO₄. The experiment results show that the Nd:Gd_0.3Lu_0.33Y_0.37VO₄ crystal is more favorable than Nd:YVO₄, Nd:LuVO₄, and Nd:Lu_0.2Y_0.8VO₄ for doubly QML lasers with AO modulator and SWCNT-SA.

Index Terms—SWCNT-SA, doubly QML laser, mixed vanadate crystal.

Gang Zhang is with Colllege of Science, China University of Petroleum (East China), Qingdao 266555, China.
Shengzhi Zhao is with School of Information Science and Engineering, Shandong University, Jinan, China.
Bin Zhao is with College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou, China.
Yonggang Wang is with Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, China.

Cite: Gang Zhang, Shengzhi Zhao, Bin Zhao, Yonggang Wang, "Improvement of Doubly Q-Switching and Mode-Locking Performance with Nd-Doped Mixed Vanadate Crystals," International Journal of Applied Physics and Mathematics vol. 5, no. 2, pp. 137-143, 2015.