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Ultrafast Terahertz Spectroscopy and Imaging

Description:

Three independent femtosecond laser systems are used for generating ultrafast pulses in the mid-IR and Terahertz (THz) spectral regions through the UV; infrared, THz and visible multi-element focal plane array cameras and instrumentation for capturing images and 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.

Apparatus includes two femtosecond solid-state laser systems that are CW Diode pumped (YVO4) with 20-femtosecond Ti: sapphire oscillators and KHz Ti: sapphire regenerative amplifiers with mid-IR Optical Parametric Amplifiers (OPA) and nonlinear crystals for generating ultrafast pulses in the far-IR through UV; visible near-IR CCD and bolometer multichannel detector arrays and instrumentation for directly capturing images and transient spectra by up-converted THz images of samples.

Ti-sapphite kilohertz laser system used for generating 2 watts at 805nm pulses for time-resolved THz spectroscopy (background table). The regenerative amplifier (center) is pumped by a 20 watt nanosecond laser. The OPA (foreground) is used to generate tunable visible and near-infrared excitation pulses for pum-Thz probing of photovoltaics as well as mid-IR probes for the TRIR apparatus.

Ti-sapphire kilohertz laser system which generates 2 watts at 805 nm 40 fs pulses for time-resolved THz spectroscopy (TRTS, background table). The regenerative amplifier (center) is pumped by a 20 watt nanosecond laser. The OPA (foreground) is used to generate tunable visible and near-infrared excitation pulses for pump-THz probing of photovoltaics as well as mid-IR probes for the TRIR apparatus.

Time-resolved THz spectrometer for spectral determinations of samples (0.2 to 10 THz) and transient spectroscopy of biomolecular and material characterization

Time-resolved THz spectrometer for spectral measurements of samples (0.2 to 10 THz) and transient spectroscopy of bimolecular, photovoltaic, and materials characterization.

 

Terahertz imaging apparatus employing high-power pulsed GaAs antenna generator and object transmissiona and reflection geometries for hyperspectral studies relevant to homeland security applications

Terahertz imaging apparatus employing high-power pulsed GaAs antenna or Lintium Niobate generators and object transmission and reflection geometries for direct imaging and hyperspectral studies relevant to homeland security applications.
Contact

Name: Edwin Heilweil
Phone: 301-975-2370
Fax: 301-869-7682
Email: edwin.heilweil@nist.gov
Address:
100 Bureau Drive M/S8443
Gaithersburg, MD 20899-8443