Publications

23 Results

Search results

Jump to search filters

Photofragmentation approaches for the detection of polyatomic molecules

Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010

Reichardt, Thomas A.; Hoops, Alexandra A.; Headrick, Jeffrey M.; Farrow, Roger L.; Settersten, Thomas B.; Bisson, Scott E.; Kulp, Thomas J.

We review three photofragmentation detection approaches, describing the detection of (1) vapor-phase mercuric chloride by photofragment emission, (2) vapor-phase nitro-containing compounds by photofragmentation-ionization, and (3) surface-bound organophosphonate compounds by photofragmentation-laser-induced fluorescence. © 2010 Optical Society of America.

More Details
TYPE Conference YEAR 2010
ScopusOSTI

Detection of mercuric chloride using a fiber laser

23rd Annual International Pittsburgh Coal Conference, PCC - Coal-Energy, Environment and Sustainable Development

Reichardt, Thomas A.; Hoops, Alexandra A.; Kliner, Dahv A.V.; Koplow, Jeffrey

We demonstrate photofragment emission with a compact fiber-laser source to measure gaseous HgCl2 concentration with the goal of developing a real-time stand-off speciating mercury emissions monitor. Assuming typical flue gas concentrations (74% N2, 12% CO2, 8% H2O, and 6% O2) at 200°C, we calculate a stand-off detection limit of 0.7 ppb for a fieldable monitoring instrument.

More Details
TYPE Conference YEAR 2006
OSTIScopus

High-peak-power (>1.2 MW) pulsed fiber amplifier

Proceedings of SPIE - The International Society for Optical Engineering

Farrow, Roger L.; Kliner, Dahv A.V.; Schrader, Paul; Hoops, Alexandra A.; Moore, Scan W.; Hadley, G.R.; Schmitt, Randal L.

We report results from Yb-doped fiber amplifiers seeded with two microchip lasers having 0.38-ns and 2.3-ns pulse durations. The shorter duration seed resulted in output pulses with a peak power of > 1.2 MW and pulse energy of 0.67 mJ. Peak power was limited by nonlinear processes that caused breakup and broadening of the pulse envelope as the pump power increased. The 2.3-ns duration seed laser resulted in output pulses with a peak power of >300 kW and pulse energy of > 1.1 mJ. Pulse energies were limited by the onset of stimulated Brillouin scattering and ultimately by internal optical damage (fluences in excess of 400 J/cm 2 were generated). In both experiments, nearly diffraction-limited beam profiles were obtained, with M 2 values of < 1.2. Preliminary results of a pulse-amplification model are in excellent agreement with the experimental results of the amplifiers operating in the low-to-moderate gain-depletion regime.

More Details
TYPE Conference YEAR 2006
ScopusOSTI
23 Results
23 Results