宽波带二次谐波产生过程中误差函数的研究

发布时间：2018-01-18 13:22

本文关键词：宽波带二次谐波产生过程中误差函数的研究　出处：《激光与红外》2017年02期 　论文类型：期刊论文

【摘要】：在无泵浦损耗近似(undepleted pump approximation,UPA)下用模拟退火算法设计的非周期光学超晶格(aperiodi optical superlattice,AOS)中实现了1.06~1.08μm波长范围内高转换效率的宽波带二次谐波产生(second harmonic generation,SHG),并且在该结构中研究了已有文献所提出的误差函数对宽波带SHG过程的适用性。该文献提出的误差函数可以用来很好地估计SHG过程中UPA的适用范围,并且指出误差函数只跟SHG的转换效率有关。研究结果表明:宽波带SHG过程中的误差函数曲线与该文献提出的误差函数曲线(本文中称其为标准曲线)是有偏离的,也即该文献提出的误差函数曲线并不适用于宽波带SHG过程。这是因为在实现宽波带SHG的结构中并不能达到好的准相位匹配(quasi phase matching,QPM),该文献提出的误差函数曲线只有在满足完美的QPM的情况下才完全适用。并且还发现在宽波带SHG过程中,误差函数不仅与SHG的转换效率有关,与入射的基频波波长也有关系;对于某些误差函数曲线与标准曲线偏离不大的波长,该文献提出的误差函数曲线可以近似地用来估计UPA的适用范围。
[Abstract]:At no pump loss approximately undepleted pump approximation. The aperiodi optical superlattice of aperiodi superlattices designed by simulated annealing algorithm under UPA). Second harmonic generation with high conversion efficiency in 1.08 渭 m wavelength range is realized. SHG). In this structure, the applicability of the error function to the wide band SHG process is studied, which can be used to estimate the applicable range of UPA in the SHG process. It is pointed out that the error function is only related to the conversion efficiency of SHG. The results show that the error function curve in the wide band SHG process and the error function curve proposed in this paper are called standard curves in this paper. There's a deviation. In other words, the error function curve proposed in this paper is not suitable for wide-band SHG processes. This is because the quasi-phase matching can not be achieved in the structure of wide-band SHG. Quasi phase matching. QPM, the error function curve proposed in this paper is suitable only if the perfect QPM is satisfied, and it is also found in the wide wave band SHG process. The error function is not only related to the conversion efficiency of SHG, but also to the fundamental frequency wave length. For the wavelength with little deviation from the standard curve, the error function curve proposed in this paper can be approximately used to estimate the applicable range of UPA.
【作者单位】：晋中学院信息技术与工程学院;首都师范大学物理系理论物理中心;
【基金】：国家自然科学基金(No.11004139) 北京市自然科学基金(No.1102012) 山西省“131”领军人才工程项目资助
【分类号】：O734
【正文快照】： 1引言利用非线性材料中的频率转换效应可以拓宽激光的频率范围[1-4],随着室温电场极化技术的出现,准相位匹配(quasi phase matiching,QPM)[5-6]技术广泛地应用于各种光学超晶格材料的制备过程中,包括准周期光学超晶格(quasi-periodic optical su-perlattice,QOS)[7-8],非周期

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