John M. Klopf

Deposition of polymer barrier materials by resonant infrared pulsed laser ablation

We describe resonant infrared pulsed laser deposition (RIR-PLD) of cyclic olefin copolymer, a barrier and protective layer; for comparison, we describe RIR-PLD of polystyrene and poly(ethylene dioxythiophene) about which we already have significant knowledge. Film deposition based on resonant infrared laser ablation is a low-temperature process leading to evaporation and deposition of intact molecules. In this paper, we focus on deposition of this model barrier and protective material that is potentially useful in the fabrication of organic light emitting diodes. The films were characterized by scanning electron microscopy and Fourier-transform infrared spectroscopy. We also compared the properties of films deposited by a free electron laser and a picosecond optical parametric oscillator.

The Jefferson Lab High Power THz Facility

Jefferson Lab has commissioned a high power terahertz source facility utilizing the broadband (5 cm-1 to visible) output of the JLab IR Demo FEL accelerator. Synchrotron and edge radiation from the 300 fs relativistic electron beam pulses at up to 75 MHz repetition rate is imaged in a User Lab where it is analyzed and made available for experiments. A number of state-of-the-art diagnostic tools are available for use with the beam. This talk will present the results of early studies on the beam.