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研究了5个新型硼酸盐晶体样品Na5[B2P3O13](NBP),SrB4O7(SBO),Na3La9O3(BO3)8(NLBO),Zn3BPO7(ZBP)和PbB4O7(PBO)在太赫兹频率的光谱响应,发现在1.5THz以下的频率范围里,样品均具有较好的透过性质,其中SBO和NLBO吸收系数小于10cm-1.特别地,在所研究的频率范围里,SBO不仅具有最小的吸收系数,也有非常平坦的色散曲线.在ZBP和SBO的吸收谱中存在明显的共振吸收特征(ZBP:ν1=1.4THz,ν2=2.0THz;SBO:ν=2.4THz),而PBO在1.44～1.74THz和2.2～2.5THz的频率区间则有两个反常色散区域.我们从THz时域光谱数据中,提取了这5种材料在0.25～2.5THz频段的功率吸收系数和折射率谱,并对其特征和来源进行了初步的讨论.
The spectral response at terahertz frequencies of five new types of borate crystal samples, Na5 [B2P3O13] (NBP), SrB4O7 (SBO), Na3La9O3 (BO3) 8 (NLBO), Zn3BPO7 (ZBP) and PbB4O7 (PBO) In the frequency range below 1.5 THz, the samples all have good permeability, with SBO and NLBO absorption coefficients less than 10 cm-1. In particular, SBO not only has the smallest absorption coefficient but also (ZBP: ν1 = 1.4THz, ν2 = 2.0THz; SBO: ν = 2.4THz) with PBO at 1.44 ~ 1.74 THz and 2.2 There are two anomalous dispersion regions in the frequency range of ~ 2.5THz.We extracted the power absorption coefficient and refractive index spectrum of these five kinds of materials in the frequency band of 0.25 ~ 2.5THz from the THz time-domain spectral data, and analyzed their characteristics and sources Conducted a preliminary discussion.