【摘要】 本文报道了对YVO4 晶体及其掺Nd的喇曼光谱的测量结果 ,用这些结果可以了解到这种材料的声子能谱情况 ,在与其它基质材料比较中可以看出它的特点是 :分立的低声子在 5 0 0～ 80 0cm-1之间有一个间隙 ,主要的部分分布在 80 0～ 90 0cm-1附近 ,根据群论分析可以得出各喇曼谱线相应的对称性 ,而且可看出这些喇曼谱线主要来源于VO3 -4 的振动。对这种不均匀分布的声子能谱对于其光谱性能可能产生的影响也作了分析讨论。测量结果还发现掺杂能抑制原有的高能声子。更多还原

【Abstract】 In this paper, the measured Raman spectra of YVO 4 and Nd: YVO 4 crystals were reported. These results give a clear information on the phonon energy spectra, these are several discrete phonons in low energy region, then nothing shows up in a large space from 500-800 cm -1 and main portion of phonon spectra is distributed in the region of 800-900 cm -1 . Based on the group theory, the symmetries for Raman lines can be deduced, and they are almost due to the vibration of VO 3- 4 ion. The effect of uneven distribution for phonon spectra on the optical transition and laser performance are discussed. The restraint action of doped ion on the high energy phonon is found.更多还原