title: Squeezed light at 1550 nm with a quantum noise reduction of 12.3 dB.
abstract: Continuous-wave squeezed states of light at the wavelength of 1550 nm have recently been demonstrated, but so far the obtained factors of noise suppression still lag behind today's best squeezing values demonstrated at 1064 nm. Here we report on the realization of a half-monolithic nonlinear resonator based on periodically-poled potassium titanyl phosphate which enabled the direct detection of up to 12.3 dB of squeezing at 5 MHz. Squeezing was observed down to a frequency of 2 kHz which is well within the detection band of gravitational wave interferometers. Our results suggest that a long-term stable 1550 nm squeezed light source can be realized with strong squeezing covering the entire detection band of a 3rd generation gravitational-wave detector such as the Einstein Telescope.
authors.affiliation: Institut fur Gravitationsphysik der Leibniz Universitat Hannover,Hannover, Germany. moritz.mehmet@aei.mpg.de
authors.forename: Moritz
authors.initials: M
authors.lastname: Mehmet
authors.forename: Stefan
authors.initials: S
authors.lastname: Ast
authors.forename: Tobias
authors.initials: T
authors.lastname: Eberle
authors.forename: Sebastian
authors.initials: S
authors.lastname: Steinlechner
authors.forename: Henning
authors.initials: H
authors.lastname: Vahlbruch
authors.forename: Roman
authors.initials: R
authors.lastname: Schnabel
mesh_terms: D016477:Artifacts; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006112:Gravitation; D007909:Lenses; D008027:Light; D008962:Models, Theoretical; D055096:Optical Devices; D011789:Quantum Theory; D012542:Scattering, Radiation; D061351:Telescopes