II 型周期性极化磷酸钛氧钾中二次谐波相位匹配带宽的拓宽

Broadening of the second-harmonic phase-matching bandwidth in type II periodically poled KTP.

作者信息

Wu Rui, Chen Yuping, Zhang Junfeng, Chen Xianfeng, Xia Yuxing

机构信息

Department of Physics, State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.

出版信息

Appl Opt. 2005 Sep 10;44(26):5561-4. doi: 10.1364/ao.44.005561.

DOI:10.1364/ao.44.005561

PMID:16163804

Abstract

We have theoretically demonstrated type II broadband second-harmonic generation (SHG) based on a quasi-phase-matching (QPM) configuration in periodically poled KTP (PPKTP). The wavelength dependence of QPM grating periods at different temperatures of 5 degrees C, 25 degrees C, and 45 degrees C is calculated with the crystal length of 1 cm. We find a very wide bandwidth, as large as 42.6 nm, of fundamental wavelength of 1.58 microm at the telecommunication band with the QPM period of 48.9 microm at 25 degrees C. The corresponding bandwidths of incident angle and temperature are found to be 4.24 degrees and 14.8 degrees C, respectively. The comparison among PPKTP, periodically poled lithium niobate (PPLN), and MgO:PPLN reveals the unique performance of PPKTP in the broadband SHG.

摘要

我们从理论上证明了基于周期性极化磷酸钛氧钾（PPKTP）中的准相位匹配（QPM）配置的II型宽带二次谐波产生（SHG）。在晶体长度为1厘米的情况下，计算了5摄氏度、25摄氏度和45摄氏度不同温度下QPM光栅周期的波长依赖性。我们发现在电信波段，当25摄氏度下QPM周期为48.9微米时，1.58微米的基波波长具有非常宽的带宽，高达42.6纳米。发现入射角和温度的相应带宽分别为4.24度和14.8摄氏度。PPKTP、周期性极化铌酸锂（PPLN）和氧化镁掺杂的PPLN之间的比较揭示了PPKTP在宽带SHG方面的独特性能。