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采用共线相位匹配和小角度非共线相位匹配相结合的联合调谐方式,设计并实验构建了具有宽调谐范围的中红外飞秒光参量放大器.采用两级LiNbO3飞秒OPA,可输出2.0～4.7μm波长范围可调谐的中红外飞秒激光,调谐范围大幅超过了目前文献报道的数据,获得的中红外飞秒激光脉冲能量超过30μJ.
The mid-infrared femtosecond optical parametric amplifier with wide tuning range is designed and experimentally constructed by the combination of collinear phase matching and small-angle non-collinear phase matching.The two-stage LiNbO3 femtosecond OPA can output 2.0 ~ The tunable mid-infrared femtosecond laser with 4.7μm wavelength range greatly exceeds the data reported in the literature, and the obtained mid-infrared femtosecond laser pulse energy exceeds 30μJ.