Improved measurement of multimode squeezed light via an eigenmode approach
Improved measurement of multimode squeezed light via an eigenmode approach
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DOI：
10.1103/physreva.66.053815
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发表时间：
2002-11-01
影响因子：
2.9
通讯作者：
Boyd, RW
中科院分区：
文献类型：
--
作者：
Bennink, RS;Boyd, RW
我们用不同的方法分析了简并光参量放大器的输出，以理解和表征多模压缩光。这种方法是基于本征模的压缩的概念，并预测的模式结构的本地振荡器，应使用，以测量最小的正交噪声。虽然模式匹配的重要性是众所周知的，我们发现，典型的实验设置是次优的，我们预测，在这种情况下，压缩光测量站显着改善与适当的整形（在空间和/或时间）的本地振荡器字段根据理论的结果。在相位失配可忽略或很小的条件下，发现最佳本振脉冲宽度近似等于泵浦脉冲宽度和非线性响应时间的几何平均值。此外，我们发现，压缩模式的有效数量可以通过改变泵浦脉冲宽度和/或相位匹配参数来改变。
We analyze the output of a degenerate optical parametric amplifier using a different approach to understanding and characterizing multimode squeezed light. This approach is based on the concept of eigenmodes of the squeezing and predicts the mode structure of the local oscillator that should be used in order to measure the smallest quadrature noise. Although the importance of mode matching is well known, we find that typical experimental setups are suboptimal and we predict that in such cases squeezed light measurements stand to be improved noticeably with appropriate shaping (in space and/or time) of the local oscillator field in accordance with the results of the theory. Under conditions of negligible or small phase mismatch, the optimal local oscillator pulse duration is found to be approximately equal to the geometric mean of the pump pulse duration and nonlinear response time. Also, we find that the effective number of squeezed modes can be altered by varying the pump pulse duration and/or phase-matching parameters.