  Coupled-resonance spectroscopy has been recently reported and applied for
spectroscopic measurements and laser stabilizations. With coupled-resonance
spectroscopy, one may indirectly measure some transitions between the excited
states that are hard to be measured directly because of the lack of populations
in the excited states. An improvement of the coupled-resonance spectroscopy by
combining the technology of electromagnetically induced transparency (EIT) is
proposed. The coupled-resonance spectroscopy signal can be significantly
enhanced by EIT. Several experimental schemes have been discussed. The line
shape of the EIT-enhanced coupled-resonance spectroscopy has been
calculated.The EIT-enhanced coupled-resonance spectroscopy can be used for
simultaneously stabilizing two lasers to the same atomic source.
