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arXiv 1102.1218physics.optics
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LiNbO3光整流产生振幅超过1 MV/cm的单周期太赫兹脉冲

Single-cycle THz pulses with amplitudes exceeding 1 MV/cm generated by optical rectification in LiNbO3

H. Hirori, A. Doi, F. Blanchard, K. Tanaka

摘要:

采用倾斜脉冲强度波前方案,利用飞秒激光脉冲在铌酸锂中的光整流产生单周期太赫兹脉冲。在太赫兹产生装置中,满足光栅像与倾斜光脉冲波前重合的条件,以获得最佳的太赫兹光束特性和泵浦-太赫兹转换效率。所设计的聚焦结构使准直后的太赫兹光束聚焦紧密,光斑尺寸接近衍射极限,最大太赫兹电场为1.2 MV/cm。

英文摘要:

Using the tilted-pulse-intensity-front scheme, we generate single-cycle terahertz (THz) pulses by optical rectification of femtosecond laser pulses in LiNbO3. In the THz generation setup, the condition that the image of the grating coincides with the tilted-optical-pulse front is fulfilled to obtain optimal THz beam characteristics and pump-to-THz conversion efficiency. The designed focusing geometry enables tight focus of the collimated THz beam with a spot size close to the diffraction limit, and the maximum THz electric field of 1.2 MV/cm is obtained.

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