Characterization Of Diode-pumped Q-switched And Mode-locking Nd～(3+): GdVO₄ Lasers

Pulsed lasers have been used widely in various fields, such as optical communication, medical, materials processing and nonlinear optics. Diode-pumped solid-state lasers have various advantages such as high conversion efficiency, long lifetime, compactness and high stability. Consequently, developing techniques for Q-switching or mode-locking in diode-pumped lasers has been burgeoning as a new exploration to get compact pulsed lasers. In this dissertation, we discussed the technologies of fundamental wavelength and second harmonic wavelength Q-switched and mode-locking laser properties in diode-pumped Nd³⁺:GdVO₄ solid-state lasers. The contents can be outlined as below:1. Review of the history and development of all-solid-state pulses lasers. The main approaches and new results of all-solid-state pulses laser at present are summarized.2. Investigation of the lasing properties of a diode-pumped Nd³⁺:GdVO₄ passively Q-switched and mode-locking laser with Cr⁴⁺:YAG saturable absorber. An analysis of the temporal shape of a single Q-switched envelope with mode-locked pulse trains is presented. 1.04 W Q-switched mode-locking laser output in the 1064nm is obtained, and the modulation depth is about 100%.3. The theory of the second harmonic generation is introduced simply. A diode-pumped passively Q-switched and mode-locking Nd³⁺:GdVO₄ /KTP green laser with a Cr⁴⁺:YAG saturable absorber is explored for the first time. In our experiment, 173 mW Q-switching and mode-locking laser output in the second harmonic wavelength of 532 nm is obtained.4. With a Low Temperature GaAs saturable absorber as well as an output coupler we obtain diode-pumped Nd³⁺:GdVO₄ laser Q-switched and mode-locking operation. In our experiment, 953 mW Q-switched and mode-locking laser output in the 1064 nm is obtained.5. With a Low Temperature GaAs as intracavity saturable absorber we obtain diode-pumped Nd³⁺:GdVO₄ laser Q-switched and mode-locking operation. In our experiment, Q-switched and mode-locking laser output power of 750 mW in the 1064 nm is obtained.