Optical scatter of quantum noise filter cavity optics
Optical scatter of quantum noise filter cavity optics
复制标题
量子噪声滤波器腔光学器件的光学散射
DOI：
10.1088/0264-9381/32/13/135019
复制
发表时间：
2014
影响因子：
3.5
通讯作者：
M. Zerrad
中科院分区：
文献类型：
--
作者：
D. Vander;C. Amra;M. Lequime;F. Magaña;J. Smith;M. Zerrad
用于过滤压缩光以降低量子噪声的光学腔需要具有非常低的散射损耗的光学器件。我们报告测量光散射从两个超抛光熔融石英光学应用高反射离子束溅射介电涂层之前和之后。我们使用了成像散射仪，其用线性偏振的1064 nm波长激光以固定的入射角照射样品，并记录激光束平面中方位角的反向散射图像。我们从这些图像中提取的双向反射分布函数（BRDF）的光学涂层和不涂层，并估计其集成散射。我们发现，这些涂层的应用导致了超过50%的增加的综合广角散射，5.00 ± 0.30？> 3.38 ± 0.20？两个涂覆样品的ppm。此外，涂层光学器件的BRDF函数呈现最大值与方位角的图案。我们比较散射模型表明，这是定性一致的粗糙度散射从涂层界面。这些结果是更广泛的研究的一部分，以了解和最大限度地减少干涉引力波探测器的量子噪声滤波腔的光损耗。对于激光干涉引力波天文台（LIGO）设想的16米长的过滤腔，这些样品测量的散射是可以接受的，尽管进一步减少损失将提高LIGO的量子噪声限制性能。
Optical cavities to filter squeezed light for quantum noise reduction require optics with very low scattering losses. We report on measured light scattering from two super-polished fused silica optics before and after applying highly-reflective ion-beam sputtered dielectric coatings. We used an imaging scatterometer that illuminates the sample with a linearly polarized 1064 nm wavelength laser at a fixed angle of incidence and records images of back scatter for azimuthal angles in the plane of the laser beam. We extract from these images the bidirectional reflectance distribution function (BRDF) of the optics with and without coating and estimate their integrated scatter. We find that application of these coatings led to a more than 50% increase of the integrated wide-angle scatter, to 5.00 ± 0.30 ?> and 3.38 ± 0.20 ?> ppm for the two coated samples. In addition, the BRDF function of the coated optics takes on a pattern of maxima versus azimuthal angle. We compare with a scattering model to show that this is qualitatively consistent with roughness scattering from the coating layer interfaces. These results are part of a broader study to understand and minimize optical loss in quantum noise filter cavities for interferometric gravitational-wave detectors. The scattering measured for these samples is acceptable for the 16 m long filter cavities envisioned for the Laser Interferometer Gravitational-wave Observatory (LIGO), though reducing the loss further would improve LIGO’s quantum-noise limited performance.
影响因子：
35
作者：
Aasi, J.;Abadie, J.;Zweizig, J.
通讯作者：
Zweizig, J.