  We observe -9.01$\pm$0.14 dB of squeezing and +15.12$\pm$0.14 dB of
antisqueezing with a local oscillator phase locked in homodyne measurement. In
reference [1], two main factors are pointed out which degrade the observed
squeezing level: phase fluctuation in homodyne measurement and intracavity
losses of an optical parametric oscillator for squeezing. We have improved the
phase stability of homodyne measurement and have reduced the intracavity
losses. We measure pump power dependences of the squeezing and antisqueezing
levels, which show good agreement with theoretical calculations taking account
of the phase fluctuation.
