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通过对聚片多畴LiNbO3晶体倍频效应的研究,从实验上对Bloembergen等人所提出的准位相匹配理论进行了细致的检验。首先运用Maker条纹法在实验上直接测定了单畴LiNbO3晶体在eω·eω→e2ω非位相匹配下的倍频光强,并采用角度扫描和温度扫描方法,以获得满足准位相匹配条件时的不同片数的聚片多畴晶体的最大倍频强度,从而验证了聚片多畴晶体倍频相对光强与片畴数N成平方关系。在N<200时,取得We studied the second harmonic generation of light in LiNbO3 crystals with periodic laminar ferroelectric domains, in order to make a detailed experimental verification of the theory of quasi-phase-matching proposed by N. Bloembergen et al. First we determined the second harmonic light intensity of single domain LiNbO3 crystals in the regime eω ·eωe→e2ω. Then by using angle-scanning and temperature-scanning, we obtained the maximum second harmonic output from crystals with periodic domains corresponding to quasi-phase-matching. We have verified experimentally the relation that the second harmonic output is proportional to N2(N is the number of domains in the crystal) with N up to 200. We have compared the second harmonic output of crystals with periodic laminar domains in the quasi-phase-matching regime with that of single domain crystals of the same length and optical quality under phase-matched condition oω· oω→e2ω. An order of magnitude enhancement of second harmonic light output has been found. Finally, the structure sensitivity of the second harmonic generation of LiNbO3 crystal with periodic laminar ferroelectric domains has also been studied experimentally.
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