氘含量对DKDP晶体横向受激拉曼散射增益系数的影响

摘要

In this paper, the spontaneous Raman spectra of K(H1−xDx)2PO4 (DKDP) crystals with different deuteration degrees in the Z(XX)Y scattering geometry are measured. And the Raman spectroscopy parameters including Raman shift, full-width at half maximum, and scattering intensity, which are related to the transverse stimulated Raman scattering (TSRS) gain coefficients, are analyzed in detail. Using the Raman scattering from water as a reference, the TSRS gain coefficients of DKDP crystals with different deuteration degrees are derived. It is found that with increasing deuteration degree in DKDP crystal the TSRS gain coefficient first decreases to about 40.1% of the KDP crystal, then increases to about 68.9%. We regard the change of the full-width at half maximum as the main reason for the dependence of TSRS gain coefficient on the deuteration degree.%本文测量了不同氘含量K(H1−xDx)2PO4晶体(DKDP晶体)在Z(XX)Y 散射配置下的自发拉曼散射光谱，并详细分析了氘含量对与横向受激拉曼散射(TSRS)增益系数有关的拉曼频移、半峰宽和散射强度的影响.然后通过与去离子水拉曼散射对比得出了不同氘含量DKDP晶体的TSRS增益系数.结果表明随着氘含量的增加DKDP晶体的TSRS增益系数先减小至KDP晶体的40.1%，后增大至68.9%；本文认为掺氘后拉曼半峰宽的变化是引起TSRS增益系数随氘含量变化的主要原因.