Squeezed vacuum phase control at 2 μm

M. J. Yap, D. W. Gould, T. G. McRae, P. A. Altin, N. Kijbunchoo, G. L. Mansell, R. L. Ward, D. A. Shaddock, B. J.J. Slagmolen, D. E. McClelland

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We demonstrate phase control for vacuum-squeezed light at a 2 μm wavelength, which is a necessary technology for proposed future gravitational wave observatories. The control scheme allowed examination of noise behavior at frequencies below 1 kHz and indicated that squeezing below this frequency was limited by dark noise and scattered light. We directly measure 3.9 + 0.2 dB of squeezing from 2 kHz to 80 kHz and 14.2 + 0.3 dB of antisqueezing relative to the shot noise level. The observed maximum level of squeezing is currently limited by photodetector quantum efficiency and laser instabilities at this new wavelength for squeezed light. Accounting for all losses, we conclude the generation of 11.3 dB of squeezing at the optical parametric oscillator.

Original languageEnglish (US)
Pages (from-to)5386-5389
Number of pages4
JournalOptics Letters
Issue number21
StatePublished - 2019
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Squeezed vacuum phase control at 2 μm'. Together they form a unique fingerprint.

Cite this