  Interferometry, as the key technique in modern precision measurements, has
been used for length diagnosis in the fields of engineering metrology and
astronomy. Analogous interferometric technique for time domain precision
measurement is a significant complement to the spatial domain applications and
requires the manipulation of the interference on the extreme time and energy
scale. Here we present an all-optical interferometry for high precision
measurement with attosecond temporal and hundreds of meV energy resolution. The
interferometer is based on laser driven high order harmonics which provide a
robust sequence of attosecond temporal slits. As applications, we reconstruct
the waveform of an arbitrarily polarized optical pulse using the time resolving
capability, and capture the abnormal character of the transition dipole near a
Cooper minimum in argon using the energy resolution provided. This novel
attosecond interferometry opens the possibility for high precision measurement
in time energy domain using an all-optical approach.
