在LiNbO $_3$、LiTaO $_3$和BBO晶体中通过光整流产生多兆太赫兹脉冲
Multicycle terahertz pulse generation by optical rectification in LiNbO$_3$, LiTaO$_3$, and BBO crystals
摘要：
我们报道了飞秒激光脉冲在块状铌酸锂（LiNbO $_3$）晶体中相位匹配光整流产生的14.8 THz的多频、窄带太赫兹辐射。我们的实验和模拟表明，当输入激光脉冲具有高啁啾时，输出的太赫兹能量大大增强，这与通常的光整流过程相反。我们发现这种反常的行为归因于线性电光（或Pockels）效应，其中在LiNbO $_3$中传播的激光脉冲被其产生的太赫兹场调制，这反过来又驱动光学整流更有效地产生太赫兹场。这种共振级联效应可以大大提高太赫兹转换效率时，输入激光脉冲适当的预啁啾与额外的三阶色散。我们还观察到类似的多兆太赫兹发射钽酸锂（LiTaO $_3$）在14太赫兹和硼酸钡（BBO）在7太赫兹，10.6太赫兹，和14.6太赫兹，所有产生的窄带相位匹配光整流。
英文摘要：
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.
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