Abstract

By using both a $\beta \text{-}\mathrm{Ba}{\mathrm{B}}_2{\mathrm{O}}_4$ (BBO) electro-optic (EO) modulator and a GaAs saturable absorber, a laser-diode (LD) end-pumped doubly Q-switched $\mathrm{Y}\mathrm{V}{\mathrm{O}}_4∕\mathrm{Nd}:\mathrm{Y}\mathrm{V}{\mathrm{O}}_4$ laser is realized. A symmetric factor is defined to describe the temporal symmetry of output pulses. At $20\mathrm{W}$ incident pump power, a symmetric factor of 1.04 is obtained by the doubly Q-switched laser with $2.5\mathrm{ns}$ pulse width and $300\mathrm{kW}$ peak power. The experimental results show that the double Q-switching can generate a symmetric and shorter pulse with higher peak power in comparison with the single EO Q-switching. In order to explain these results, a rate equation model has been developed, and it leads to good agreement with the experimental data.

© 2009 Optical Society of America

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