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首页> 外文期刊>Physical review, D >Cryogenic mechanical loss of a single-crystalline GaP coating layer for precision measurement applications
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Cryogenic mechanical loss of a single-crystalline GaP coating layer for precision measurement applications

机译：用于精密测量应用的单晶GaP涂层的低温机械损耗

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The first direct observations of gravitational waves have been made by the Advanced LIGO detectors. However, the quest to improve the sensitivities of these detectors remains, and epitaxially grown single-crystal coatings show considerable promise as alternatives to the ion-beam sputtered amorphous mirror coatings typically used in these detectors and other such precision optical measurements. The mechanical loss of a 1 ? ? μ m thick single-crystalline gallium phosphide (GaP) coating, incorporating a buffer layer region necessary for the growth of high quality epitaxial coatings, has been investigated over a broad range of frequencies and with fine temperature resolution. It is shown that at 20?K the mechanical loss of GaP is a factor of 40 less than an undoped tantala film heat-treated to 600 ? ? ° C and is comparable to the loss of a multilayer GaP/AlGaP coating. This is shown to translate into possible reductions in coating thermal noise of a factor of 2 at 120?K and 5 at 20?K over the current best IBS coatings (alternating stacks of silica and titania-doped tantala). There is also evidence of a thermally activated dissipation process between 50 and 70?K.
机译：先进的LIGO探测器对重力波进行了首次直接观测。然而，仍然需要提高这些检测器的灵敏度，并且外延生长的单晶涂层显示出可观的前景，可以替代通常用于这些检测器和其他此类精密光学测量的离子束溅射无定形反射镜涂层。机械损耗1？ ？已经在很宽的频率范围内和精细的温度分辨率下研究了微米厚的单晶磷化镓（GaP）涂层，该涂层结合了高质量外延涂层的生长所必需的缓冲层区域。结果表明，在20？K时，GaP的机械损耗比热处理到600？K的未掺杂的塔塔拉膜少40倍。 ？且与多层GaP / AlGaP涂层的损失相当。结果表明，与目前最好的IBS涂层（交替堆叠二氧化硅和掺杂二氧化钛的钽）相比，涂层热噪声在120？K时可能降低2倍，在20？K时降低5倍。也有证据表明，热激活的耗散过程在50至70？K之间。

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