Description:
Three independent femtosecond laser systems used for generating ultrafast pulses in the mid-IR (and THz) through the UV; infrared and visible multi-element focal plane array cameras and instrumentation for capturing the transient spectra of samples with a single laser pulse; detection systems capable of making accurate time-resolved amplitude and phase measurements on THz pulses as they interact with samples; crystals for nonlinear frequency conversion.
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Kilohertz Ti-Sapphire time-resolved infrared (TRIR) apparatus using a Kapteyn-Murnane 25 fs oscillator seeded regenerative amplifier (with compact stretcher-compressor and home-built single pockels cell design) pumped by a 10 Watt Spectra Physics Evolution (background, left). The amplifier output (0.9 W at 80 fs FWHM) pumps a Spectra Physics OPA-800f (not shown) that generates tunable ~100 fs IR probe pulses by difference frequency mixing (DFM) in silver-gallium-sulfide (2.8 to 14 microns). Excitation of samples (in enclosed purged compartment at right) occurs via 400 nm or 267 nm harmonics of the regenerative amplifier (foreground). Difference transmission TRIR spectra across the DFM bandwidth are obtained by a computer-controlled scanning monochromator fitted with a probe and reference broadband MCT detectors (top right).
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Pulsed Dye-laser based system with diode-pumped solid-state Nd:Vanadate, 2 Watt, 80 MHz pump for three independently tunable synchronous dye lasers. Home-built seeded 20 Hz Nd:YAG regenerative amplifier generates 25 mJ 532 nm pulses to pump three linear dye amplifier chains (ca. 0.7 to 1 mJ pulsed output energy) for UV excitation and difference frequency mixing mid-IR probe generation.
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Mid-infrared pump-probe apparatus including dual-beam probe normalization to reduce spectral intensity fluctuations and IR spectrograph outfitted with a cooled 256x256 InSb Focal Plane Array camera as the detector.
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Associated Programs/Projects:
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