标题：Diode-pumped doubly Q-switched mode-locked YVO_(4)/Nd:YVO_(4) laser with AO and GaAs saturable absorber
作者：Yan Zhang;Shengzhi Zhao;Dechun Li;Kejian Yang;Guiqiu Li;Gang Zhang;Kang Cheng
作者机构：[Zhang, Y] School of Information Science and Engineering, Shandong University, Jinan 250100, China;[ Zhao, S] School of Information Science and Engine 更多
通讯作者地址：[Zhao, SZ]Shandong Univ, Sch Informat Sci & Engn, Jinan 250100, Peoples R China.
来源：Optics Communications: A Journal Devoted to the Rapid Publication of Short Contributions in the Field of Optics and Interaction of Light with Matter
关键词：YVO_(4)/Nd:YVO_(4) crystal;Q-switched and mode-locked;Laser stability;Modulation depth
摘要：By using both acousto-optic (AO) modulator and GaAs saturable absorber, a diode-pumped doubly Q-switched and mode-locked (QML) YVO_(4)/Nd:YVO_(4) laser is presented. The average output power and the pulse width of the Q-switched envelope have been measured. The Q-switch pulse energy of the doubly QML laser are higher than that only with GaAs. The stability of the QML laser with the dual-loss-modulation is significantly improved if compared to that only with GaAs. The experimental results show that the doubly QML YVO_(4)/Nd:YVO_(4) laser has nearly 80percent modulation depth and deeper than that of the singly passively QML pulse. The doubly Q-switched mode-locked pulse inside the Q-switched envelope has a repetition rate of 111 MHz and its pulse width is estimated to be about 700 ps. By using a hyperbolic secant square function and considering the Gaussian distribution of the intracavity photon density, the coupled equations for diode-pumped dual-loss-modulated QML laser is given and the numerical solutions of the equations are in good agreement with the experimental results.