# Dissertation Defense by James Philip Hendrie on Tailored Frequency Comb Structures and Their Sensing Applications

Departmental News

Posted: August 11, 2019

Date: Monday, August 12th, 2019

Time:  9:30 AM

Location:  CHTM, Room 103

Map to CHTM:

One such application is the enhancement of Intracavity Phase Interferometry (IPI).  IPI is a technique in which two pulses propagate within a shared active oscillator.  These pulses experience a difference in phase, $\Delta\phi$, which results in a frequency comb shift of , where  is the round-trip time of the oscillator, relative to one another.   is measured as a beat-note signal when the two pulses are interfered and can be resolved at less than a kHz value with Hz resolution.  Nested cavities were introduced into this technique to further enhance the beat-note signal.  The enhancement comes from the fact that the frequency group locations in a tailored comb are set by the passive parent’s optical properties, which are frequency dependent. Therefore,  increases as the FPE’s linear dispersion further separates the two combs.  While this dissertation will focus on IPI as it relates to gyroscopes, it has also been demonstrated in magnetic field and  measurements.