Ultrashort Pulse Excitation of Dense Upconversion Media
Abstract
This project was initiated to identify conditions in dense upconversion media under which ultrashort pulses could lead to new applications. Four main results were obtained. First, a new channel for the generation of ultraviolet upconversion emission in Erbium-doped compounds was discovered. Second, an extremely promising imaging technique which relies on time-gated, ultrafast upconversion was demonstrated. Third, induced nonlinear response in dense upconversion materials was shown to be primarily dispersive in nature, even for resonant interactions, and we were able to explain how this apparently contradictory behavior arises. This revealed for the first time that cooperative nonlinearities could be useful in lossless, ultrafast applications. Fourth, a local mode of Yb in CsCdBr3 crystals was identified with properties which should permit coherent control of upconversion by ultrashort pulses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 10, 1997
- Accession Number
- ADA332831
Entities
People
- Stephen C. Rand
Organizations
- University of Michigan