Chris M. Lawson

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We describe a coherence-based imaging technique based on degenerate four-wave mixing in two materials. First, a 45 degrees -cut BaTiO(3) crystal was used as a self-pumped phase conjugator to obtain depth-resolved images through a 4 mean-free-path (mfp) scattering media. In addition, an HITC dye-doped K15 liquid-crystal layer was used to provide single-shot(More)
A novel fiber-optic sensor that determines pressure from diaphragm curvature is discussed. This sensing technique exhibits a high degree of sensitivity and linearity and is less susceptible to environmental perturbations than previous intensity-modulating techniques. Experimental results are presented for a miniature pressure transducer suitable for in vivo(More)
We have measured the third-order susceptibility, X((3)), versus concentration for a number of molybdenum-based metal-organic complexes in solution, using independent degenerate four-wave mixing and Z-scan techniques. Good agreement was obtained between the degenerate four-wave mixing and Z-scan measurements. The variation of X((3)) with concentration(More)
We have observed nonlinear reflection and transmission at a dielectric-carbon microparticle suspension interface. Nonlinear reflectivities of as much as 90% were measured using frequency-doubled, 5-ns Nd:YAG laser pulses. This result is attributed to laser-induced cavitation and the resulting refractive-index change in the carbon suspension that leads to(More)
Recent measurements of transmission versus fluence for a methanol-solvated asymmetric pentaazadentate porphyrin-like (APPC) cadmium complex, @(C6H4 – APPC)Cd]Cl, showed the limitations of current energy-level models in predicting the transmission behavior of organic reverse saturable absorbers at fluences greater than 1 J/cm2. A new model has been developed(More)
Optical time domain reflectometry (OTDR) measurements are performed to characterize the minimum reflection signature from poly(methyl methacrylate) plastic-fiber splices. The dominant splice reflection sources that are due to inexact index matching and fiber core misalignment are eliminated. A clearly detectable intrinsic OTDR reflection signature is(More)
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