This paper proposes a blue LD pumping Pr:YLF crystal acousto-optic Q-switched double pulse laser with 639 nm red light output. The output principle of the Pr:YLF double pulse laser is demonstrated, and a four level differential rate equation model is established to describe the distribution of the double pulse sequence at a high repetition frequency. When the laser repetition frequency is 10 kHz, the double step signal generator, as the modulator of the acousto-optic Q-switching, turns on the Q-switching twice in one pumping period, and obtains the maximum output power of 144 mW, pulse energy of 7.1μJ and the output of visible light double pulse with the pulse interval of 20 μs.
The output characteristics of a narrow linewidth, no-gain competition, dualwavelength solid-state laser using an intra-cavity pumped method are reported. This system consists of an intra-cavity pumped Nd:YVO 4 laser emitting at 1064 nm, using a 912 nm Nd:GdVO 4 laser. A Fabry-Perot etalon is used to compress the linewidth that located at the common cavity of 912 nm and 1064 nm laser. Theoretical analysis and experimental verification were carried out. When the pump power is 32.8 W, the output of 912 nm and 1064 nm theoretical value is 0.036 W and 0.046 W, and the experimental value is 0.017 W and 0.016 W, respectively. The change trend of the theoretical simulated output power value was the same as the actual measured value in the experiment. In addition to this, the experimental measurement shows when the etalon with an angle of 15˚, corresponding minimum linewidths were 0.284 nm and 0.627 nm, respectively.
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