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We present the measurement of χ(3) nonlinearity of Green Fluorescent Protein. The nonlinear index is n2 = 10−19m2/W, opening the possibility of using genetically engineerable and naturally occuring proteins in cells as a source of four wave mixing experiments.
We present time-resolved X-ray absorption measurements of vanadium dioxide using ionizations radiation generated by a femtosecond pulsed laser source in combination with superconducting microcalorimeters capable of measuring energies of individual radiation quanta.
We demonstrate real-time drift correction of a quantum cascade laser based direct absorption trace-gas sensor using a rotating in-line reference cell. High accuracy and performance sufficient for long-term environmental monitoring has been demonstrated.
We report results from high precision spectroscopic instruments for atmospheric trace gases using with mid-IR quantum cascade lasers. Numerous gases can be measured with 1s absorption noise ∼1×10−6, allowing e.g. 1s OCS precision of 10−12.
We desorb polymer films from fused silica with a femtosecond laser and characterize the results by atomic force microscopy. Our study as a function of beam geometry and energy reveals two ways of achieving spatially controlled nanodesorption.
Absorption spectra of neutral uranium atoms generated in a laser-induced plasma are measured with tunable diode lasers to determine line widths and pressure broadening coefficients. Various background gases are examined at pressures from 10–760 Torr.
Combining 300 ns-pulsed quantum cascade lasers with an open-path- setup allows recording of micro-spectra (∼2 cm−1) resolving narrow absorption bands of gaseous analytes during a single pulse, while minimizing the influence of the environmental matrix.
Saturable absorption of nanosecond and picosecond duration pulses in a thin HgCdTe film is reported at 4.6 μm. The material shows promise as a mode locker for mid-infrared ultrafast lasers.
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