Eur. Phys. J. D 44, 181-186 (2007)
https://doi.org/10.1140/epjd/e2007-00138-1

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 dabaojiu@126.com

Received: 4 December 2006
Published online: 30 March 2007

Abstract

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.