论文标题
多个准相匹配在相位逆转光学超晶格结构中的第二次谐波产生
Multiple quasi phase matched second harmonic generation in phase reversal optical superlattice structure
论文作者
论文摘要
域设计的准阶段匹配（QPM）设备以其多功能性和调整非线性光学频率转换过程的能力而闻名。在本文中，提出了一种简单的方法，以生成相位逆转光学超级晶格（PROS）结构中多个准阶段匹配的第二谐波生成（SHG）。理论研究是通过基于结构域逆转niobate QPM设备的模拟进行的。当相位逆转（PR）域沿设备的长度以相等和不相等的间隔分布时，分析了生成的多个SHG光谱的性质。相等间隔的相位反转域的分布仅限于双重SHG峰的产生，而与其数量无关。相反，我们可以以不等的间隔生成具有PR域分布的相等强度多重SHG峰。使用此方案，通过在PROS QPM设备的特定位置分配四个PR域来生成五个峰QPM SHG。分析PR域及其在PROS QPM设备中的位置的依赖性以设计理想的多波长转换器
Domain-engineered quasi-phase-matching (QPM) devices are known for its versatility and ability to tune the nonlinear optical frequency conversion process. In this paper, a simple approach is presented to generate multiple quasi-phase-matched second-harmonic generation (SHG) in the phase reversal optical superlattice (PROS) structure. Theoretical studies are carried out by simulation based on the domain reversed lithium niobate QPM devices. The nature of the generated multiple SHG spectra is analyzed when the phase reversal (PR) domains are distributed at equal and unequal intervals along the length of the device. The distribution of phase reversal domains at equal intervals is limited to the generation of dual SHG peaks irrespective of its number. On the contrary, we could generate equal-intensity multiple SHG peaks with PR domains distribution at unequal interval. Using this scheme, five peaks QPM SHG are generated by distributing four PR domains in specific locations of the PROS QPM device. The dependency of the PR domain and its location in the PROS QPM device are analyzed to design desirable multi-wavelength converters
