Information-measuring Complex Development for Detecting High-frequency Gravitational Waves

Abstract

Currently, there are several international projects aimed at gravitational-wave detection, such as LIGO (USA), VIRGO (Italy, France), TAMA-300 (Japan), GEO 600 (Germany), etc. Within the framework of abovementioned projects, detectors were developed to detect gravitational waves of rare astrophysical events in the frequency range of 100 - 1000 Hz. Modern cosmological theories predict the existence of high-frequency relic gravitational waves that appeared at the initial stage of the Universe formation. Their detection is possible owing to use of high-frequency gravitational detectors in the range of 10 5 – 10 10 Hz. An essential detector component is a system of control and data processing, which allows us to synchronise data from several independent detectors. The paper describes an information-measuring complex to test a technique for detecting high-frequency fluctuations in the space-time metric and its main elements. The complex consists of two identical units based on the Fabry-Perot interferometer with highly reflective mirrors and a two-meter resonator. A solid-state Nd: YAG laser with a wavelength of λ = 1064 nm is used as a pump laser. The DET10N2 InGaAs detector with a working spectral region of 500-1700 nm and an active region of 0.8 mm 2 provides signal detection The synchronisation system described in the paper allows us to read data from several independent detectors with a minimum time delay and at the same time to bind the time of detection to the world one.