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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; Optical Parametric Amplifiers (OPA) and crystals for nonlinear frequency conversion.

Apparatus includes two femtosecond laser systems that are solid-state CW Diode pumped (YVO4) with 20-femtosecond Ti: sapphire oscillators and KHz Ti: sapphire regenerative amplifiers with a mid-IR OPAs 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 ot 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 805nm 40 fs 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 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