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We present the first two-dimensional fluorescence spectroscopy measurements of uranium isotopes in femtosecond laser ablation plasmas. A new method of signal normalization is presented to reduce noise in absorption-based measurements of laser ablation.
Spatio-temporal mapping of LIF in laser-induced plasmas is studied. A tunable continuous wave frequency doubled Ti:sapphire laser was used to probe specific Al transitions in the expanding plasma at a number of spatial positions.
We present the first results using broadband dual-comb spectroscopy in a laser-induced plasma. Preliminary results identifying 85Rb and 87Rb isotopes are shown using this technique.
We perform standoff detection of 14NH3 and 15NH3 at a 10 Hz rate in a chemical plume with varying concentration using an external cavity quantum cascade laser swept over the range 930–1065 cm−1.
We present the first measurements of tunable laser absorption spectroscopy in femtosecond laser ablation plasmas. Time-resolved absorption spectra of uranium and aluminum are measured with high spectral and high temporal resolution.
We present tunable laser induced fluorescence of selected Al transitions in a laser produced plasma at atmospheric pressure levels. Two-dimensional mapping of absorption-emission spectroscopy of Al transitions is made.
We demonstrate a sensor based on tunable diode laser absorption spectroscopy for the detection of hydrogen fluoride (HF) gas at ambient pressure. Absorption from the HF R(1) ro-vibrational peak at ν̃ = 4038.962 cm−1 (2.476 µm) in the fundamental (Δν = 1) band is measured. A quantitative spectral fit based on HITRAN data is used to account for overlapping spectral peaks of HF and water vapor, with...
We present a tunable diode laser absorption spectrometer (TDLAS) sensor for hydrogen fluoride (HF) detection at ambient pressure operating around the fundamental R(1) transition at 2.476 µm. We achieve 38 ppt sensitivity for 1-s integration time.
We present a study of the spectral and angular dependence of scattered mid-infrared light from surfaces coated with explosives residues (TNT, RDX, and tetryl) detected at a 2 m standoff distance. An external cavity quantum cascade laser provided tunable illumination between 7 and 8 μm. Important differences were identified in the spectral features between specular reflection and diffuse scattering...
A simple external-cavity quantum cascade laser utilizing optical feedback from a partial reflector is reported. Using a ∼9.6µm QCL and off-the-shelf optics we demonstrate single-mode continuous tuning of 2.46cm−1 with ∼40mW power and ∼2.5MHz linewidth.
A hyperspectral imaging system using an external cavity quantum cascade laser and a focal plane array acquiring images at 25 Hz from 985 cm−1 to 1075 cm−1 with a resolution of 0.3 cm−1 is demonstrated.
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