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Gravitational Wave (GW) is very small temporal variation of space distortion which is caused from the change of enormous mass such as inspiral and merger of black hole binaries, explosion of supernovae, and the inflation in the early universe. In order to detect GW directly, long-baseline laser interferometers have been developed by many countries and, at long last, the first direct detection of GW...
The Sr Optical Lattice Clock (OLC) was developed by Prof. Katori in 2005 [1], and also research on it has been conducted as major candidates for the next generation optical frequency standards. The light sources for Sr-OLC is required to be single tunable frequency, long-term stability, portable, and high beam quality. One of the key technologies for improving OLC is a high power trapping laser for...
We have developed the precision timing and rf signal dissemination system for the X-ray free electron laser (XFEL), under construction in Japan. The optical frequency comb was transmitted through a 1-km length-stabilized optical fiber for disseminating both rf and timing signals. The phase fluctuations of the rf signals at 5.712 GHz was suppressed down to 0.0042 radian that is used for synchronizing...
DECIGO (DECI-hertz Interferometer Gravitational wave Observatory) is a space gravitational wave antenna which consists of three 1000-km Fabry-Perot interferometers to detect space distortion with the strain sensitivity of δl/l<10−23 around 0.1 Hz[1]. Before planned launch of DECIGO in 2027, DECIGO pathfinder (DPF) is also planned to launch in 2015 for establishing technical feasibility [2]...
We’ve developed local oscillator dissemination system for ALMA. The high-purity 120GHz local oscillator was delivered as a heterodyne beat signal over 25 km through length corrected optical fibers with phase fluctuation of 10−2 radian.
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