English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The polarisation Sagnac speedmeter interferometer has the potential toreplace the Michelson interferometer as the instrumental basis for futuregenerations of ground-based gravitational wave detectors. The quantum noisebenefit of this speedmeter is dependent on high-quality polarisation optics,the polarisation beam-splitter (PBS) and quarter-waveplate (QWP) optics thatare key to this detector configuration and careful consideration of the effectof birefringence in the arm cavities of the interferometer. A PBS with anextinction ratio of better than 4000 in transmission and 700 in reflection fora $41^{\circ}$ angle of incidence was characterised along with a QWP ofbirefringence of $\frac{\lambda}{4} + \frac{\lambda}{324}$. The cavity mirroroptics of a 10m prototype polarisation Sagnac speedmeter were measured to havebirefringence in the range $1\times10^{-3}$ to $2\times10^{-5}$ radians. Thislevel of birefringence, along with the QWP imperfections, can be canceled outby careful adjustment of the QWP angle, to the extent that the extinction ratioof the PBS is the leading limitation for the polarisation Sagnac speedmeter interms of polarisation effects.

classical and quantum gravity

Experimental investigation of the limitations of polarisation optics for  future gravitational wave detectors based on the polarisation Sagnac  speedmeter