Spatio-spectral phase-matching in broadband soliton mode-locked lasers

A spatio-spectral phase-matching theory is introduced. It is used to improve broadband modelocking of a Ti:sapphire laser with a tunable enhancement of >15dB at long wavelengths while maintaining a good beam profile

Gough Island--evaluation of a fractional crystallization model and an experimental study of the partitioning of a rare earth element in the system diopside/water,

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1972.Vita.Includes bibliographical references.by Robert A. Zielinski.Ph.D

Quantum simulation and metrology with multilevel fermions in an optical lattice

Ultracold atomic systems are exquisite platforms for studying many-body physics and developing quantum technologies. Alkaline-earth(-like) atoms (AEA) in particular offer unique capabilities for pushing the state-of-the-art in quantum simulation and sensing capabilities. These atoms have an ultranarrow electronic transition that is used as the basis for the world's best atomic clocks. Moreover, AEAs can have a rich internal structure owing to nuclear spin degrees of freedom that are largely untapped as a scientific, metrological, and computational resource. In this thesis, we explore some of the possibilities and prospects for exploring many-body quantum phenomena and advancing sensing capabilities with ultracold AEAs.We begin on the simulation end with a deep dive into the emergence of multi-body interactions between ultracold AEAs. We then present a proposal to harness collisional interactions and inhomogeneities in an AEA-based clock for the preparation of many-body entangled states known as spin-squeezed states, which allow for a quantum enhancement to clock sensitivity. In order to analyze this proposal's prospects and limitations, we develop a numerical technique for simulating collective quantum spin systems, which may find external applications for studying operator growth and quantum chaos. Borrowing ideas from the proposal to improve AEA-based clocks, we examine the possibility of spin squeezing using power-law interactions that can be found in a variety of atomic, molecular, and optical systems. Combining the spirit of our investigation into exotic interactions with the roadmap of our proposal to improve AEA-based clocks, we then propose a way to engineer a multilevel spin model with infinite-range interactions in the nuclear spin degrees of freedom of AEAs. We study the dynamical phases of this system, characterized by order parameters with a simple physical interpretation, and propose ways to measure these order parameters using standard techniques.</p

Materials and Molecular Research Division annual report 1982

This report is divided into: materials sciences, chemical sciences, nuclear sciences, fossil energy, advanced isotope separation technology (AISI), energy storage, magnetic fusion energy (MFE), nuclear waste management, and work for others (WFO). Separate abstracts have been prepared for all except AIST, MFE, and WFO. (DLC