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Frequency-doubling of continuous laser light in the Laguerre Gaussian modes LG(0,0) and LG(3)(,3)

机译:Laguerre高斯模式LG(0,0)和LG(3)的连续激光频率加倍(0,0)(,3)

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摘要

For future generations of gravitational wave detectors, it is proposed to use the helical Laguerre-Gaussian LG(3)(,3) mode to reduce thermal noise, which limits the detector sensitivity. At the same time, this requires the efficient generation of squeezed vacuum states in the LG(3)(,3) mode for quantum noise reduction. Since this technique includes the process of second harmonic generation (SHG), we experimentally compare the conversion efficiency and harmonic output field of the LG(0,0) and LG(3)(,3) modes in a cavity-enhanced SHG using the same 7% doped MgO:LiNbO3 crystal. Conversion efficiencies of 96% and 45% are achieved, respectively. The influence of mode mismatches and astigmatism is analyzed to estimate the ratio of the pump mode-dependent effective nonlinearities to be d(0,0)/d(3,3)similar to 5. Furthermore, we show that absorption loss in the crystal is more relevant for the LG(3)(,3) mode. (C) 2020 Optical Society of America
机译:对于后代的重力波检测器,建议使用螺旋Laguerre-Gaussian Lg(3)(3)(3)模式来降低热噪声,这限制了检测器灵敏度。 同时,这需要在LG(3)(3)模式下有效地产生挤压的真空状态,用于量子噪声降低。 由于该技术包括二次谐波生成(SHG)的过程,我们通过使用该技术实验地比较LG(0,0)和LG(3)(,3)模式的转换效率和谐波输出字段 相同的7%掺杂MgO:Linbo3晶体。 转换效率分别实现96%和45%。 分析了模式不匹配和散光的影响以估计泵模式依赖性有效非线性的比率为D(0,0)/ D(3,3),类似于5.此外,我们表明晶体中的吸收损失 与LG(3)(3)模式更相关。 (c)2020美国光学学会

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