Analytical and experimental studies on the diode-pumped, simultaneously Q-switched and mode-locked c-cut Nd:GdVO4/KTP green laser with LT-GaAs absorber
School of Information Science and Engineering, Shandong University, Jinan, 250100, P.R. China
Corresponding author: a email@example.com
Published online: 30 March 2007
A diode-pumped passively Q-switched mode-locked (QML) intracavity frequency doubled c-cut Nd:GdVO4/KTP green laser with a LT-GaAs saturable absorber is presented. More than 90% modulation depth for the mode-locked green pulses has been achieved. Using the hyperbolic secant function methods, a developed rate equation model for Q-switched and mode-locked lasers considering the Gaussian spatial distribution of the intracavity photon intensity, the influences of continuous pump rate, the upper state lifetime of the active medium, and the excited-state lifetime of the saturable absorber, was proposed. With this developed model, the theoretical results are in good agreement with the experimental results and the width of the mode-locked green pulse was estimated to be about 380 ps.
PACS: 42.60.Fc – Modulation, tuning, and mode locking / 42.60.Gd – Q-switching / 42.55.Xi – Diode-pumped lasers
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007