Study on Mid-Infrared Energy Conversion of a Doubly Resonant Optical Parametric Oscillator Using Aperiodically Poled Lithium Niobate
Zijian Wang; Bingyang Li; Yuheng Wang; Renzhe Han; Yaru Yang; Yongji Yu; Guangyong Jin
This paper presents an external-cavity dual-wavelength mid-infrared multiple optical parametric oscillator based on a single MgO:APLN crystal, which is pumped by a pulsed 1.064 &mu:m laser. The output power and beam qualities of parametric lasers at different repetition rates and transmittance were studied. When the pump power of the 1.064 &mu:m laser was 34.5 W, the repetition rate was 63 kHz, the maximum output powers of 2.79 W@3.30 &mu:m and 4.92 W@3.84 &mu:m were obtained with the transmittance T = 60%@1.57 &mu:m, corresponding to optical&ndash:optical conversion efficiencies of 8.1% and 14.3%, respectively. Meanwhile, the beam qualities of two mid-infrared laser beams were effectively optimized and the pulse widths of 9.72 ns@3.30 &mu:m and 9.67 ns@3.84 &mu:m were obtained synchronously.
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