A dual-wavelength alternately Electro-Optic (EO) Q-switched output laser operating at 1064 and 1319nm is demonstrated. The mathematical model describing the operation mechanism of alternately Q-switched output of dual-wavelength laser was put forward, and the principle of the dual-wavelength laser alternately Q-switched output was analyzed. When the full pumping current of Nd:YAG (A) crystal is 90 A and that of Nd:YAG (B) crystal is 70 A, alternating dual-wavelength pulsed lasers are achieved with a delay of 200μs at the pulse repetition frequency (PRF) of 10 Hz under the voltage on RTP crystals of 1000V. The results show that the experimental results were consistent with the theory, which proved the correctness of the theory of dual-wavelength laser alternately Q-switched laser.
For the asymmetric plane-plane cavity, the influence of cavity length as a variable factor on the thermal lens diopter, dynamic stable zone, and modes selection in the stable zone is discussed. The relationship between the length of the cavity and the width of the dynamic stability zone is pointed out. The influence of the ratio of the long arm to the short arm on the degree of separation of the various oscillation modes is indicated. A suitable pump operating point for modes selection is indicated. A end-pump Nd:YVO4 cavity with different long arms is built up for modes selection experimentally, the fundamental mode and hollow beam (TEM01+TEM10) output are observed in the experiments, which are concordant with the theoretical predictions.
We develop a theoretical model of multimode rate equation that accurately describes mode evolution mechanism of prelase Q-switched Pr3+:YLF single longitudinal mode (SLM).The theoretical simulation process explained each part of the operation and experimental phenomenon in the pre-lase process effectively.We identify that there is an optimal parameter for the two step signal of acoustic-optic modulator which determines the stability of SLM output.Our theoretical model can be applied to most solid-state lasers, and offer theoretical references for the design and construction of experimental facilities, which is significant for future research.Up to now, there is still not a complete theory to accurate description of prelase Q-switching technology. Moreover, there have been no reported about directly emitting Q-switched SLM laser in the visible region.
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