  We present an ultrahigh-$Q$, solid-silica microrod resonator operated under
ambient conditions that supports laser-fractional-frequency stabilization to
the thermal-noise limit of $3 \times 10^{-13}$ and a linewidth of 62 Hz. We
characterize the technical-noise mechanisms for laser stabilization, which
contribute significantly less than thermal noise. With fiber photonics, we
generate optical and microwave reference signals provided by the microrod modes
and the free-spectral range, respectively. Our results suggest the future
physical considerations for a miniature, low noise, and robust
optical-frequency source.
