Mapping the optical absorption of a substrate-transferred crystalline AlGaAs coating at 1.5 µ m
Mapping the optical absorption of a substrate-transferred crystalline AlGaAs coating at 1.5 µ m
复制标题
绘制 1.5 µm 基底转移结晶 AlGaAs 涂层的光吸收图
DOI：
10.1088/0264-9381/32/10/105008
复制
发表时间：
2015
影响因子：
3.5
通讯作者：
Steinlechner J
中科院分区：
文献类型：
--
作者：
Steinlechner J
第二代和第三代干涉引力波探测器的灵敏度将受到测试质量镜和高反射涂层的热噪声的限制。与目前使用的非晶涂层相比，最近开发的结晶涂层显示出有前途的热噪声降低。然而，对涂层的光学性能也有严格的要求。我们已经映射了晶体AlGaAs涂层的光学吸收，该涂层针对1064 nm的波长的高反射率进行了优化。在1530 nm处测量吸收，其中涂层叠层透射约70%的激光。测得的吸收率低于
The sensitivity of second and third generations of interferometric gravitational wave (GW) detectors will be limited by the thermal noise of the test-mass mirrors and highly reflective coatings. Recently developed crystalline coatings show a promising thermal noise reduction compared to presently used amorphous coatings. However, stringent requirements apply to the optical properties of the coatings as well. We have mapped the optical absorption of a crystalline AlGaAs coating that is optimized for high reflectivity for a wavelength of 1064 nm. The absorption was measured at 1530 nm, where the coating stack transmits approximately 70% of the laser light. The measured absorption was lower than