Optical Science and Engineering ETDs

Publication Date

Summer 7-29-2025

Abstract

In this dissertation a sensing method applying to any physical quantity that modifies optical phase is developed. Two pulses are produced inside a synchronously pumped Optical Parametric Oscillator, generating two identical, undistinguishable frequency combs. The physical quantity to be measured applies a small phase shift/round trip to one of the pulses, resulting in a frequency shift of the corresponding comb. The latter frequency is measured as a beat by interfering the two combs on a detector. A world record resolution, close to the quantum limit, of 0.033 nanoradian (corresponding to 0.006 fm in displacement) is achieved. A detailed analysis of the parameters affecting the signal to noise is presented. It leads to further methods of enhancing the sensitivity through miniaturization on a chip, and coupling the OPO to a microresonator will bring the displacement sensitivity beyond that of LIGO. The research opens pathways to applications in fundamental.

Degree Name

Optical Science and Engineering

Level of Degree

Doctoral

Department Name

Optical Science and Engineering

First Committee Member (Chair)

Jean-Claude Diels

Second Committee Member

Alejandro Aceves

Third Committee Member

Tara Drake

Fourth Committee Member

Terefe Habteyes

Keywords

correlated frequency combs, interferometry, nanoscopy, optical parametric oscillator, phase sensing, ultrashort pulses

Document Type

Dissertation

Language

English

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