直接准相位匹配四波混频。

Direct quasi-phase-matched fourth-harmonic generation.

作者信息

Chen Xianfeng, Chen Yuping, Xia Yuxing

机构信息

Institute of Optics and Photonics, Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China.

出版信息

Appl Opt. 2005 Feb 20;44(6):1028-31. doi: 10.1364/ao.44.001028.

DOI:10.1364/ao.44.001028

PMID:15751694

Abstract

We have theoretically demonstrated direct fourth-harmonic generation (FHG) based on a quasi-phase-matching (QPM) configuration in periodically poled lithium niobate. The wavelength dependence of period of FHG QPM gratings is calculated. Bandwidths of fundamental wavelength, temperature, and incident angle are also studied. We find a very wide bandwidth, as large as 115 nm, of fundamental wavelength near the wavelength of 3797 nm with the QPM period of 9.73 microm. The numerical calculation shows that the conversion efficiency for QPM FHG and cascading QPM by two-step second-harmonic generation is almost identical.

摘要

我们从理论上证明了基于周期极化铌酸锂中准相位匹配（QPM）结构的直接四波混频（FHG）。计算了FHG QPM光栅周期的波长依赖性。还研究了基波波长、温度和入射角的带宽。我们发现，在QPM周期为9.73微米时，在3797纳米波长附近的基波波长具有高达115纳米的非常宽带宽。数值计算表明，QPM FHG和通过两步二次谐波产生的级联QPM的转换效率几乎相同。