Observation of Squeezed Light in the 2 μ m Region

Georgia L. Mansell, Terry G. McRae, Paul A. Altin, Min Jet Yap, Robert L. Ward, Bram J.J. Slagmolen, Daniel A. Shaddock, David E. McClelland

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


We present the generation and detection of squeezed light in the 2 μm wavelength region. This experiment is a crucial step in realizing the quantum noise reduction techniques that will be required for future generations of gravitational-wave detectors. Squeezed vacuum is generated via degenerate optical parametric oscillation from a periodically poled potassium titanyl phosphate crystal, in a dual resonant cavity. The experiment uses a frequency stabilized 1984 nm thulium fiber laser, and squeezing is detected using balanced homodyne detection with extended InGaAs photodiodes. We have measured 4.0±0.1 dB of squeezing and 10.5±0.5 dB of antisqueezing relative to the shot noise level in the audio frequency band, limited by photodiode quantum efficiency. The inferred squeezing level directly after the optical parametric oscillator, after accounting for known losses and phase noise, is 10.7 dB.

Original languageEnglish (US)
Article number203603
JournalPhysical Review Letters
Issue number20
StatePublished - May 17 2018
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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