Enhancement of the phase response of intracavity phase interferometers

A system comprising:

• a laser having a cavity structured to operate with at least two pulses within its cavity, said pulses shorter in length that said laser cavity;
• a resonant element disposed in said laser cavity, said resonant element amplifies any frequency difference between said at least two pulses;
• and
• said resonant element is one of the following:
• Gires-Tournois interferometer actively coupled to the laser cavity;
• an atomic vapor cell;
• a crystal phase matched to generate the second harmonic of all pulses;
• a sphere coupled to said laser by an evanescent wave;
• a microring resonator coupled to said laser by an evanescent wave;
• or a Gires-Tournois interferometer and the coupling between the Gires-Tournois and the laser cavity is achieved by a Fabry-Perot etalon.