Abstract

The main design principles of external cavity quantum cascade lasers with ultra-fast tuning in a broad spectral range for combustion and explosion diagnostics will be discussed. Specifically, laser active region design and overall system design will be covered.

Abstract

Methods for facilitating the fast energy release of aluminum to enhance detonation performance will be discussed. The energy release rates of milligram-quantity samples have been compared by measuring the laser-induced shock wave velocities and tracking the formation of AlO on both the microsecond- and millisecond-timescales.

Abstract

Rapid progress is being made in directed energy studies towards the development of laser weapons. Systems are now planned for deployment on a number of different platforms, to counter multiple threat scenarios. This paper addresses some of the principal challenges.

Abstract

A fast temperature diagnostic for time-resolved measurements in harsh environments based on an acousto-optically modulated quantum cascade laser is demonstrated in shock-heated mixtures of carbon monoxide. The temperature measurements made with this system are largely insensitive to beam steering noise.

Abstract

This talk will discuss efforts to image pressures, temperatures, and chemical species in post-detonation environments. The talk will focus on applications of high-speed imaging to understanding the mechanisms of energy release in the explosive near-field, and the approach to chemical freeze-out in simulations of explosions.

Abstract

An overview of various plume diagnostic tools used for characterizing the explosion events and laser-produced plasmas will be presented. Details of optical spectroscopic (emission, absorption and fluorescence) and imaging for obtaining plume fundamentals, isotopic information, hydrodynamics, internal structures, shock propagation, turbulence etc. will be presented.

Abstract

Abstract

I will present a review of the current state of the art of spectroscopic methods for measuring temperature and chemical species at high temperatures and pressures. I will show measurement results from various experimental platforms including shock tubes, flow reactors, laser-ablation plumes, and high-pressure optical cells.

Abstract

The origin contact resistance in organic field-effect transistors will be discussed, along with the impact on device performance and accuracy in extraction of device parameters. A strategy for reducing contact resistance will be presented; it consists of creating high-workfunction domains at the surface of the injecting electrodes.

Abstract

By careful consideration of solid-state organization, crystallographic disorder, and major phonon modes, small-molecule semiconductors can be optimized to yield impressive charge transport properties. Similar optimization of solid-state order can also be applied to high-performance singlet fission materials for solar power harvesting.

Abstract

The ability to control nanoscale morphology and molecular organization in organic semiconducting polymer films is an important prerequisite for enhancing efficiency of organic thin-film devices. In this presentation, we will report on a novel “bottom-up” approach towards semiconducting polymer thin films based on surface-initiated polymerization.

Abstract

We employ the well-studied donor/acceptor system consisting of tris(2,2'-bipyridine)ruthenium(II) and anthracene to validate a simple rate equation model for energy transfer and subsequent dimerization of the excited anthracene acceptor.