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Selection rules for the orbital angular momentum of optically produced THz radiation

机译：光学产生的THz辐射轨道角动量的选择规则

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In this work, we theoretically study the transduction of orbital angular momentum (OAM) l for infrared pump lasers into the THz domain. In the case of optical rectification, the transduction of OAM occurs only through a spin-orbit interaction, with the selection rule on the OAM l = 0 valid for any kind of polarization of the pump, which means that there is no transfer of OAM along the propagation axis. In difference frequency generation, the selection rule for the difference Delta l between the OAM of the pump fields with linear or circular polarization is l = Delta l, whereas l ranges from Delta l - 2 to Delta l + 2 in cases of both radial and azimuthal polarization. Moreover, forTHzgeneration in the latter case, the high diffraction obtained with tightly focused pumps yields l tending to Delta l +/- 2, while l tends to zero in the opposite case of large pump beams. (C) 2021 Optical Society of America
机译：在这项工作中，我们从理论上研究了红外泵浦激光器的轨道角动量（OAM）l向太赫兹区的转换。在光学整流的情况下，OAM的转换仅通过自旋轨道相互作用发生，OAM l=0上的选择规则适用于任何类型的泵浦偏振，这意味着OAM不会沿传播轴转移。在差频生成中，具有线性或圆形极化的泵场的OAM之间的差值δl的选择规则为l=δl，而在径向和方位极化的情况下，l的范围为δl-2到δl+2。此外，在后一种情况下，通过紧密聚焦泵浦获得的高衍射产生的l趋于δl+/-2，而在大泵浦光束的相反情况下，l趋于零。（2021）美国光学学会

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