A source of THz radiation with electric field strength of more than 1 MV cm-1 on the basis of 100-Hz femtosecond Cr : forsterite laser system
A source of THz radiation with electric field strength of more than 1 MV cm-1 on the basis of 100-Hz femtosecond Cr : forsterite laser system
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DOI：
10.1070/qel16681
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发表时间：
2018-01-01
影响因子：
0.9
通讯作者：
Agranat, M. B.
中科院分区：
文献类型：
--
作者：
Ovchinnikov, A. V.;Chefonov, O. V.;Agranat, M. B.
研制了一种带宽为0.5- 2.5THz、脉冲重复频率为100 Hz的太赫兹辐射源。太赫兹产生是基于飞秒脉冲（由铬镁橄榄石激光系统产生）在非线性有机晶体OH 1的光学整流。提出了一种用于铬镁橄榄石激光系统的多程放大器的光学方案，使脉冲能量提高到2.2mJ。在1.24 μ m波长的泵浦激光辐射到太赫兹辐射的转换效率被发现是2%。当将太赫兹光束聚焦到近衍射极限光斑时，获得了3.5MV cm（-1）的电场强度。
A source of terahertz (THz) radiation with a bandwidth of 0.5-2.5 THz and a pulse repetition rate of 100 Hz has been developed. The THz generation is based on optical rectification of femtosecond pulses (generated by a Cr : forsterite laser system) in a nonlinear organic crystal OH1. An optical scheme of a multipass amplifier for the Cr : forsterite laser system is developed to increase the pulse energy to 2.2 mJ. The conversion efficiency for pump laser radiation at a wavelength of 1.24 mu m into THz radiation is found to be to 2%. An electric field strength of 3.5 MV cm(-1) is attained when focusing a THz beam into a near diffraction-limited spot.