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推导出在掺杂摩尔分数为5%氧化镁的铌酸锂晶体中,非寻常光的温度依赖折射率公式.结果表明,室温条件下,当泵浦波长为1.064μm时,在周期极化掺杂氧化镁的铌酸锂晶体中,产生4.0μm波长所需要的光栅周期要比周期极化纯铌酸锂的小.当泵浦能量为220μJ时,光学参量谐振腔中信号光1.45μm处最大转换效率可达1.46%.实验证明,晶体的光栅周期和光学谐振腔的阈值泵浦能量分别与其相应的理论值基本吻合.
The temperature-dependent refractive index of unusual light in the case of lithium niobate doped with 5% magnesia is deduced. The results show that when the pump wavelength is 1.064μm, In the hybrid MgO-doped lithium niobate crystals, the grating period required to produce 4.0μm wavelength is smaller than that of purely periodic lithium niobate.When the pumping energy is 220μJ, the optical parametric resonator has the largest signal light at 1.45μm The conversion efficiency can reach 1.46% .Experimental results show that the grating period of the crystal and the threshold pump energy of the optical resonator basically coincide with their corresponding theoretical values.