Conveners
R&D and new technologies: R&D and new technologies
- Yuta Michimura
Owing to their high optical quality and low elastic losses, substrate-transferred crystalline coatings are currently redefining the performance metrics of a range of precision metrology applications including both room temperature and cryogenic mHz-linewidth lasers for optical clocks, stabilized frequency combs for microwave generation, and ultrastable resonators for fundamental physics...
Glasses have open the possibility to discover GW when they have replaced steel suspensions and allowed better mirrors going from the first to the second generation. Would they stand the challenge of the third generation of detectors and that of Multimessenger Astronomy? The presentation is focused on answering this question, showing the efforts of the Virgo Coating R&D collaboration and the...
The generation of frequency dependent squeezing with ~100 scale filter cavities is a promising technique to obtain a broadband quantum noise mitigation in 2nd generation GW detectors and its implementation is planned in their near-term upgrade. At NAOJ, we are developing a 300 m filter cavity prototype in order to demonstrate squeezing angle rotation below 100 Hz, as required for an optimal...
Quantum Noise (QN) is a phenomenon which gives high contribution to the overall noise in the advanced interferometric Gravitational Wave detectors. In the revious interferometer generation the most relevant QN component was dominating in the high frequency region (300 Hz-10 kHz) of the detection band which could be corrected by injection of optimal squeezed state [1]. Virgo Scientific...
In this talk, I will report our recent implementation of squeezed vacuum states at 1064 nm. With a bow-tie, optical parametric oscillator cavity, and our home-made balanced homodyne detectors, noise reduction up to 10dB below the vacuum is measured. With the operation of a 300 m filter cavity prototype installed at the National Astronomical Observatory of Japan, status of such a vacuum...
Euler buckling springs have demonstrated benefits over conventional blade springs used in Advanced LIGO suspensions and magnetic- and geometric anti-spring (GAS) filters used in Advanced Virgo. Firstly, the resonance frequency - essentially the frequency where seismic cut-off starts - is relatively low for the spring size. Secondly, the reduced spring mass increases the internal mode frequency...
Newtonian noise (NN) is local gravity fluctuation caused by seismic waves, atmospheric fluctuations, human activity and so on. NN is estimated to be a significant noise in low frequencies in future GW detectors. However, NN have been not measured for now, so its direct measurement is essential for reduction.
Torsion-Bar Antenna (TOBA) is a GW detector using torsion pendulums. TOBA is also...
Cryogenics, currently pioneered by KAGRA, is a common feature of basically any 3G GW interferometer (IFO) proposal and many mid-term upgrades. One of the main issues in the operation of cryogenic GW IFOs is that the extreme vibration isolation needed for the best sensitivity demands a tradeoff between cooling power and additional mechanical noise. The priority is obviously given to science...
