Mehmet Moritz, Ast Stefan, Eberle Tobias, Steinlechner Sebastian, Vahlbruch Henning, Schnabel Roman
Institut fur Gravitationsphysik der Leibniz Universitat Hannover,Hannover, Germany.
Opt Express. 2011 Dec 5;19(25):25763-72. doi: 10.1364/OE.19.025763.
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.
最近已证明了波长为1550 nm的连续波光压缩态，但到目前为止，所获得的噪声抑制因子仍落后于目前在1064 nm所展示的最佳压缩值。在此，我们报告基于周期性极化磷酸钛氧钾实现的半单片非线性谐振器，它能够直接检测到5 MHz时高达12.3 dB的压缩。在低至2 kHz的频率下观察到了压缩，该频率完全在引力波干涉仪的检测带宽内。我们的结果表明，可以实现一个长期稳定的1550 nm压缩光源，其具有强压缩，覆盖第三代引力波探测器（如爱因斯坦望远镜）的整个检测带宽。
