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arXiv 1608.05686physics.optics
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输入相位调制对相敏光放大器的影响

The effect of input phase modulation to a phase-sensitive optical amplifier

Tian Li, Brian E. Anderson, Travis Horrom, Kevin M. Jones, Paul D. Lett

摘要:

许多光学应用依赖于使用诸如声光调制器(AOM)或光学斩波器之类的设备对光束进行幅度调制。增加幅度调制(AM)的方法通常也会无意地将相位调制(PM)施加到光上。虽然这种PM对许多相位不敏感的应用没有影响,但相位敏感的过程可能会受到影响。本文研究了在热$^{85}$ Rb蒸气中实现的量子噪声限制相敏光放大器(PSA)的输入相位和幅度调制对输出的影响。我们调查的依赖PM AOM对齐,并展示了一种新的方法来量化PM使用PSA作为诊断工具。然后,我们使用这种方法来测量的光斩波器,这是由于斩波器叶片通过光束的衍射效应而产生的衍射相关PM。

英文摘要:

Many optical applications depend on amplitude modulating optical beams using devices such as acousto-optical modulators (AOMs) or optical choppers. Methods to add amplitude modulation (AM) often inadvertently impart phase modulation (PM) onto the light as well. While this PM is of no consequence to many phase-insensitive applications, phase-sensitive processes can be affected. Here we study the effects of input phase and amplitude modulation on the output of a quantum-noise limited phase-sensitive optical amplifier (PSA) realized in hot $^{85}$Rb vapor. We investigate the dependence of PM on AOM alignment and demonstrate a novel approach to quantifying PM by using the PSA as a diagnostic tool. We then use this method to measure the alignment-dependent PM of an optical chopper which arises due to diffraction effects as the chopper blade passes through the optical beam.

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