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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.
