Rosen Darin, Suzuki Aritoki, Keating Brian, Krantz William, Lee Adrian T, Quealy Erin, Richards Paul L, Siritanasak Praween, Walker William
Appl Opt. 2013 Nov 20;52(33):8102-5. doi: 10.1364/AO.52.008102.
We have developed epoxy-based, broadband antireflection coatings for millimeter-wave astrophysics experiments with cryogenic optics. By using multiple-layer coatings where each layer steps in dielectric constant, we achieved low reflection over a wide bandwidth. We suppressed the reflection from an alumina disk to 10% over fractional bandwidths of 92% and 104% using two-layer and three-layer coatings, respectively. The dielectric constants of epoxies were tuned between 2.06 and 7.44 by mixing three types of epoxy and doping with strontium titanate powder required for the high dielectric mixtures. At 140 K, the band-integrated absorption loss in the coatings was suppressed to less than 1% for the two-layer coating, and below 10% for the three-layer coating.
我们已经为毫米波天体物理学低温光学实验开发了基于环氧树脂的宽带抗反射涂层。通过使用多层涂层，其中每层的介电常数逐步变化，我们在很宽的带宽上实现了低反射。使用两层和三层涂层时，我们分别将氧化铝圆盘在92%和104%的分数带宽上的反射抑制到了10%。通过混合三种类型的环氧树脂并掺杂高介电常数混合物所需的钛酸锶粉末，环氧树脂的介电常数在2.06至7.44之间进行了调整。在140 K时，两层涂层中涂层的带积分吸收损耗被抑制到小于1%，三层涂层则低于10%。
