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双包层光纤激光器和非线性光学材料 (如周期性极化的铌酸锂晶体 ,PPLN)相结合 ,开辟了实用性非线性光学器件的一个新领域。研究了准相位匹配周期性极化反转铌酸锂晶体对宽带准连续光纤激光倍频的温度特性和频谱特性。在理论上 ,从准相位匹配相位失配关系出发 ,推导了晶体温度与抽运源中心波长的关系以及温度响应带宽 ,并和已报道实验结果进行了比较 ,二者符合得很好。此外 ,还推导了倍频周期极化铌酸锂晶体对抽运基频光源的响应谱线带宽。在实验上 ,采用长度 2 0mm ,极化周期 6 .5 μm ,厚度 0 .5mm的周期极化铌酸锂晶体光纤激光器准连续宽带输出进行了倍频 ,获得了在不同控制温度下的倍频光光谱 ,并对此进行了详细分析。
The combination of double-clad fiber lasers and non-linear optical materials, such as periodically poled lithium niobate crystals (PPLNs), opens up a new area of practical nonlinear optics. The temperature characteristics and spectral characteristics of a quasi-phase-matched periodically poled LiNbO 3 crystal for broadband quasi-continuous fiber lasers are studied. In theory, based on the phase mismatch phase mismatch relationship, the relationship between the crystal temperature and the central wavelength of pumping source and the temperature response bandwidth are deduced and compared with the reported experimental results, which are in good agreement. In addition, the bandwidth of the response spectrum of the frequency doubling period-polarized lithium niobate crystal to the pumping fundamental frequency light source is also deduced. In the experiment, the frequency of quasi-continuous wideband output was obtained by using a periodically poled LiNbO3 crystal fiber laser with a length of 20mm, a polarization period of 6.5μm and a thickness of 0.5mm, and the frequency doubling frequency was obtained under different control temperatures Light spectrum, and a detailed analysis of this.