Gurkovsky, A.G., Heinert, D., Hild, S., Nawrodt, R., Somiya, K., Vyatchanin, S.P. and Wittel, H. (2011) Reducing thermal noise in future gravitational wave detectors by employing Khalili etalons. Physics Letters A, 375(46), pp. 4147-4157. (doi: 10.1016/j.physleta.2011.07.063)
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Abstract
Reduction of thermal noise in dielectric mirror coatings is a key issue for the sensitivity improvement in the second and third generation interferometric gravitational wave detectors. Replacing an end mirror of the interferometer by an anti-resonant cavity (a so-called Khalili cavity) has been proposed to realize the reduction of the overall thermal noise level. In this article we show that the use of a Khalili etalon, which requires less hardware than a Khalili cavity, yields still a significant reduction of thermal noise. We identify the optimum distribution of coating layers on the front and rear surfaces of the etalon and compare the total noise budget with a conventional mirror. In addition we briefly discuss advantages and disadvantages of the Khalili etalon compared with the Khalili cavity in terms of technical aspects, such as interferometric length control and thermal lensing.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Hild, Professor Stefan |
| Authors: | Gurkovsky, A.G., Heinert, D., Hild, S., Nawrodt, R., Somiya, K., Vyatchanin, S.P., and Wittel, H. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Physics Letters A |
| ISSN: | 0375-9601 |
| Published Online: | 24 September 2011 |
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