Speaker
Description
The DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is an interferometer with a frequency band between 0.1 and 10 Hz. One of the main objectives of
DECIGO is to detect primordial gravitational waves (PGW) originating from inflation. However,
recent observations of cosmic microwave background lowered the upper limits of normalized
gravitational wave energy density for PGW. DECIGO is required to improve its target sensitivity.
Introducing quantum locking, homodyne detection, and optical spring to DECIGO has been considered for improvement of DECIGO’s sensitivity.
Homodyne detection and optical spring were implemented in DECIGO’s sub-cavity. Diffraction
loss occurs in DECIGO’s main cavity because the main cavity length is long, 1000 km. When incorporating an optical spring into the main cavity, vacuum field mixing corresponding to
diffraction loss must be considered.
This poster explains vacuum fields in a cavity with diffraction loss.
