基于阿基米德螺旋线超晶格结构的宽带倍频器研究  

Broadband Frequency Multipliers Based on Archimedean Spiral Chirped Superlattice Structure

作　　者：仝珍珠 何云东 管佳豪 薛少杰 薄方[2] 齐新元 TONG Zhenzhu;HE Yundong;GUAN Jiahao;XUE Shaojie;BO Fang;QI Xinyuan(School of Physics,Northwest University,Xi’an 710127,China;School of Physics,Nankai University,Tianjin 300457,China)

机构地区：[1]西北大学物理学院,西安710127 [2]南开大学物理学院,天津300457

出　　处：《现代应用物理》2024年第6期58-64,共7页Modern Applied Physics

基　　金：国家自然科学基金资助项目(61177059)。

摘　　要：宽带频率转换是非线性光学重要研究方向之一,在激光技术、光通信和光学显示等领域都具有重要意义。为实现宽带且高效的频率转换,利用仿真方法在薄膜铌酸锂晶体上设计了基于阿基米德螺旋线啁啾超晶格结构的脊型波导,模拟实现宽带二次谐波的产生。研究发现,通过采用0型准相位匹配方案,对1 525~1 575 nm基频波段扫频,可在长为3 mm的脊型波导出射端观察到高达31 nm带宽的倍频现象,且在中心波长1 550 nm处实现了高达110.8%/(W·cm^(2))的二倍频转换效率,与同等晶体长度下周期超晶格结构与线性啁啾超晶格结构相比,实现了更大的倍频带宽和更优的响应平坦度,在微型宽带倍频器的研发和集成光学元器件的应用方面具有重要潜在价值。Broadband frequency conversion is one of the important research directions in nonlinear optics,and it is of great significance in fields such as laser technology,optical communication,and optoelectronic displays.In this paper,a ridge waveguide with an Archimedean spiral chirped superlattice structure is designed based on a thin-film lithium niobate crystal using simulation method to simulate the generation of broadband second harmonic generation.It is found that by adopting the 0-type quasi-phase-matching and sweeping the frequency in the fundamental wavelength range from 1525 nm to 1575 nm,a doubling phenomenon with a bandwidth of up to 31 nm is observed at the output end of 3 mm ridge waveguide.Moreover,a high second harmonic generation conversion efficiency of up to 110.8%/(W•cm^(2))is achieved at the central wavelength of 1550 nm.Compared with periodic superlattice structure and linear chirp superlattice structure under the same crystal length,a larger doubling bandwidth and better response flatness are achieved.It has crucial potential in developing miniaturized broadband frequency doublers and integrated optoelectronic devices.

关 键 词：薄膜铌酸锂 非线性光学 准相位匹配 脊型波导 宽带频率转换 

分 类 号：O437[机械工程—光学工程] TN771[理学—光学]