论文标题
linbo $ _3 $，litao $ _3 $和BBO晶体
Multicycle terahertz pulse generation by optical rectification in LiNbO$_3$, LiTaO$_3$, and BBO crystals
论文作者
论文摘要
我们报告了多环形，窄带，Terahertz辐射，在14.8 THz中，通过在散装Niobate（Linbo $ _3 $）晶体中的飞秒激光脉冲的相匹配的光学整流产生。我们的实验和模拟表明，当输入激光脉冲高度搅动时，输出terahertz能量会大大增强，这与常见的光学整流过程相反。我们发现这种异常行为归因于线性电磁效应，其中它产生的Terahertz领域调节了Linbo $ _3 $中传播的激光脉冲，而这反过来又可以更有效地产生Terahertz Field。当对输入激光脉冲及时使用额外的三阶分散剂的固定预先校准时，这种共振级联效应可以大大提高Terahertz的转换效率。我们还观察到14 Thz的Tantalate（Litao $ _3 $）的类似的多环形Terahertz发射，在7THz，10.6 THz和14.6 THz时，它们都是由窄带相位匹配的光学整流产生的。
We report multicycle, narrowband, terahertz radiation at 14.8 THz produced by phase-matched optical rectification of femtosecond laser pulses in bulk lithium niobate (LiNbO$_3$) crystals. Our experiment and simulation show that the output terahertz energy greatly enhances when the input laser pulse is highly chirped, contrary to a common optical rectification process. We find this abnormal behavior is attributed to a linear electro-optic (or Pockels) effect, in which the laser pulse propagating in LiNbO$_3$ is modulated by the terahertz field it produces, and this in turn drives optical rectification more effectively to produce the terahertz field. This resonant cascading effect can greatly increase terahertz conversion efficiencies when the input laser pulse is properly pre-chirped with additional third order dispersion. We also observe similar multicycle terahertz emission from lithium tantalate (LiTaO$_3$) at 14 THz and barium borate (BBO) at 7 THz, 10.6 THz, and 14.6 THz, all produced by narrowband phase-matched optical rectification.
