L. Kuo
National Tsing Hua University
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Featured researches published by L. Kuo.
Science China-physics Mechanics & Astronomy | 2015
V. P. Mitrofanov; S. Chao; Huang-Wei Pan; L. Kuo; Garrett D. Cole; J. Degallaix; B. Willke
This paper reviews some of the key enabling technologies for advanced and future laser interferometer gravitational wave detectors, which must combine test masses with the lowest possible optical and acoustic losses, with high stability lasers and various techniques for suppressing noise. Sect. 1 of this paper presents a review of the acoustic properties of test masses. Sect. 2 reviews the technology of the amorphous dielectric coatings which are currently universally used for the mirrors in advanced laser interferometers, but for which lower acoustic loss would be very advantageous. In sect. 3 a new generation of crystalline optical coatings that offer a substantial reduction in thermal noise is reviewed. The optical properties of test masses are reviewed in sect. 4, with special focus on the properties of silicon, an important candidate material for future detectors. Sect. 5 of this paper presents the very low noise, high stability laser technology that underpins all advanced and next generation laser interferometers.
Optics Express | 2014
Huang-Wei Pan; Shun-Jin Wang; L. Kuo; S. Chao; M. Principe; I. M. Pinto; R. DeSalvo
Crystallization following thermal annealing of thin film stacks consisting of alternating nm-thick titania/silica layers was investigated. Several prototypes were designed, featuring a different number of titania/silica layer pairs, and different thicknesses (in the range from 4 to 40 nm, for the titania layers), but the same nominal refractive index (2.09) and optical thickness (a quarter of wavelength at 1064 nm). The prototypes were deposited by ion beam sputtering on silicon substrates. All prototypes were found to be amorphous as-deposited. Thermal annealing in air at progressive temperatures was subsequently performed. It was found that the titania layers eventually crystallized forming the anatase phase, while the silica layers remained always amorphous. However, progressively thinner layers exhibited progressively higher threshold temperatures for crystallization onset. Accordingly it can be expected that composites with thinner layers will be able to sustain higher annealing temperatures without crystallizing, and likely yielding better optical and mechanical properties for advanced coatings application. These results open the way to the use of materials like titania and hafnia, that crystallize easily under thermal anneal, but ARE otherwise promising candidate materials for HR coatings necessary for cryogenic 3rd generation laser interferometric gravitational wave detectors.
Optical Interference Coatings 2016 (2016), paper MB.12 | 2016
S. Chao; Huang-Wei Pan; L. Kuo; S. Huang; Meng-yun Wu; Yu-hang Juang; Chia-wei Lee
We show optical properties and stress related mechanical loss for silicon nitride films deposited by plasma enhanced chemical vapor deposition (PECVD) method for application in the next generation laser interference gravitational wave detector.
Optical Interference Coatings 2016 (2016), paper MB.10 | 2016
S. Chao; Huang-Wei Pan; L. Kuo; V. Pierro; M. Principe; I. M. Pinto; R. DeSalvo
The structural, optical and mechanical properties of nm-layered Titania/Silica composites are illustrated, as candidate high-index, low-thermal-noise, and cryo-friendly materials for 3rd generation interferometric GW detectors.
Physical Review D | 2018
Huang-Wei Pan; L. Kuo; S. Huang; Meng-yun Wu; Yu-hang Juang; Chia-wei Lee; Hsin-Chieh Chen; Ting Ting Wen; S. Chao
Materials Research-ibero-american Journal of Materials | 2018
L. Kuo; Huang-Wei Pan; S. Huang; S. Chao