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Terahertz parametric oscillator based on KTiOPO_4 crystal

机译:基于KTiOPO_4晶体的太赫兹参量振荡器

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KTiOPO_4 (KTP) crystal is used as the nonlinear medium in a surface-emitted terahertz-wave parametric oscillator for the first time. The oscillating Stokes beam propagates along the x axis of the KTP crystal, the pumping beam propagates with a small incident angle θ_(ext) to the x axis, and the polarizations of the pumping beam, the Stokes beam, and the THz wave are along the z axis. When θ_(ext) is changed from 1.250° to 6.000°, the THz wave is intermittently tuned from 3.17 to 3.44 THz, from 4.19 to 5.19 THz, and from 5.55 to 6.13 THz. The maximum output of the THz wave is 336 nJ, obtained at 5.72 THz with a pumping energy of 80 mJ. The two frequency gaps, from 3.44 to 4.19 THz and from 5.19 to 5.55 THz, are located in the vicinities of the A_1 modes of 134 and 178.7 cm~(-1), which are strongly infrared absorbing.
机译:KTiOPO_4(KTP)晶体首次用作表面发射的太赫兹波参数振荡器中的非线性介质。振荡的斯托克斯束沿KTP晶体的x轴传播,泵浦束以相对于x轴小的入射角θ_(ext)传播,并且泵浦束,斯托克斯束和THz波的偏振方向z轴。当θ_(ext)从1.250°更改为6.000°时,THz波会间歇地从3.17至3.44 THz,从4.19至5.19 THz和从5.55至6.13 THz调谐。太赫兹波的最大输出为336 nJ,在5.72 THz处以80 mJ的泵浦能量获得。两个频率间隔分别为3.44至4.19 THz和5.19至5.55 THz,位于134和178.7 cm〜(-1)的A_1模式附近,它们强烈吸收红外光。

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