A high energy 3.75 μm KTA optical parametric oscillator at a critical angle
A high energy 3.75 μm KTA optical parametric oscillator at a critical angle
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DOI：
10.1088/1612-2011/10/7/075407
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发表时间：
2013-07
影响因子：
1.7
通讯作者：
Qiang Liu;Jianhui Liu;Zilong Zhang;M. Gong
中科院分区：
文献类型：
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作者：
Qiang Liu;Jianhui Liu;Zilong Zhang;M. Gong
本文报道了一种高能3.75 μm纳秒KTiO AsO_4（KTA）临界角光参量振荡器（OPO）。OPO采用1.064 μm激光泵浦，KTA晶体在XZ平面内被切割成41.2°。对于中红外激光，相位匹配角位于相位匹配曲线的边缘和吸收区的边缘。腔是信号谐振振荡器。泵浦光的空间分布为准平面波，脉宽为10 ns。在泵浦能量为795 mJ时，获得了218 mJ的1.484 μm信号和60 mJ的3.75 μm闲频激光，转换效率为35%。闲频脉冲宽度为7 ns。发散角在走离平面内为4 mrad，在另一平面内为14 mrad。结果表明，KTA的OPO在3.75 μm处存在相位匹配，并且KTA的OPO在3.75 μm处可以产生高能量的闲频光。
A high energy 3.75 μm nano-second KTiOAsO4 (KTA) optical parametric oscillator (OPO) at a critical angle is demonstrated in this letter. The OPO is pumped by a 1.064 μm laser and the KTA crystal is cut at 41.2° in the XZ plane. The phase matching angle is at the edge of the phase match curve and the edge of the absorption region for mid-infrared lasers. The cavity is a signal resonant oscillator. The spatial distribution of the pump light is a quasi-plane wave and the pulse width is 10 ns. A 218 mJ signal at 1.484 μm and a 60 mJ idler at 3.75 μm are achieved with a pump energy of 795 mJ, corresponding to a conversion efficiency of 35%. The idler pulse width is 7 ns. The divergence angle in the walk-off plane is 4 mrad and it is 14 mrad in the other plane. The results prove that the OPO phase matching of KTA exists at 3.75 μm and the KTA OPO can generate a high energy idler at 3.75 μm.