Coherent cancellation of photothermal noise in GaAs/Al0.92Ga0.08As Bragg mirrors

Coherent cancellation of photothermal noise in GaAs/Al0.92Ga0.08As Bragg mirrors
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GaAs/Al0 92Ga0 08As 布拉格反射镜中光热噪声的相干消除

DOI:
10.1088/0026-1394/53/2/860
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发表时间:
2016
期刊:
影响因子:
2.4
通讯作者:
R. X. Adhikari
R. X. Adhikari
中科院分区:
工程技术3区
文献类型:
--
作者:
T. Chalermsongsak;F. Seifert;E. D. Hall;K. Arai;D. Follman;G. D. Cole;M. Aspelmeyer;E. K. Gustafson;R. X. Adhikari

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在许多高精度光学实验中,热噪声是一个限制因素。人们正在寻找具有更低热噪声的新型光学材料。其中一对材料,砷化镓和铝合金砷化镓(统称为AlGaAs),与二氧化硅和钽等传统材料相比,显示出其低布朗噪声的前景。然而,AlGaAs有可能产生高水平的热光噪声。我们已经制备了一组AlGaAs晶体涂层,转移到熔融二氧化硅衬底上,其层结构已经被优化,通过诱导热弹性和热折变效应的相干抵消来降低热光噪声。通过测量这些反射镜的光热传递函数,我们发现这种优化是成功的。
Thermal noise is a limiting factor in many high-precision optical experiments. A search is underway for novel optical materials with reduced thermal noise. One such pair of materials, gallium arsenide and aluminum-alloyed gallium arsenide (collectively referred to as AlGaAs), shows promise for its low Brownian noise when compared to conventional materials such as silica and tantala. However, AlGaAs has the potential to produce a high level of thermo-optic noise. We have fabricated a set of AlGaAs crystalline coatings, transferred to fused silica substrates, whose layer structure has been optimized to reduce thermo-optic noise by inducing coherent cancellation of the thermoelastic and thermorefractive effects. By measuring the photothermal transfer function of these mirrors, we find evidence that this optimization has been successful.
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