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Ultrafast Spectroscopy

Femtosecond Visible Transient Absorption Spectrometer (Ultrafast Systems Helios)

Contact: Jason Baxter (jbaxter@drexel.edu)
 
Important Features
  • Non-destructive ultrafast pump-probe measurements of liquid and solid samples
  • Time resolution better than 50 femtoseconds
  • Pump-probe delay times up to 3 nanoseconds
  • Probe 450 – 800 nm using sapphire white light continuum
  • Probe 350 – 600 nm using CaF2 white light continuum
  • Tunable pump wavelength from UV to mid-IR (300 nm to 10 um)
  • Options for transmission or specular reflection geometries
  • Spot size <500 microns
  • Janis ST-100 cryostat for substrate temperature range 5 – 400 K
  • Pulsed light source: Coherent Libra regeneratively amplified Ti:Sapphire laser (50 fs pulses, 1 kHz repetition rate, 3.5 mJ/pulse) with Coherent OPerA Solo optical parametric amplifier

Time-Resolved Terahertz Spectrometer

Contact: Jason Baxter (jbaxter@drexel.edu)

 

Important features

  • Non-destructive ultrafast pump-probe measurements of liquid and solid samples
  • Probe: broadband 0.1 – 3 THz (λ=0.1 – 3 mm, 3 – 100 cm-1, 0.4 – 12 meV) using ZnTe electro-optic crystals
  • High spectral resolution
  • Use for terahertz time domain spectroscopy (THz-TDS) or with pump for time-resolved terahertz spectroscopy (TRTS)
  • Tunable pump wavelength from UV to mid-IR (300 nm to 10 um)
  • Pump-probe delay times up to 1 nanosecond
  • Spot size ~ 1 mm
  • Janis ST-100 cryostat for substrate temperature range 5 – 400 K
  • Pulsed light source: Coherent Libra regeneratively amplified Ti:Sapphire laser (50 fs pulses, 1 kHz repetition rate, 3.5 mJ/pulse) with Coherent OPerA Solo optical parametric amplifier
 
Note: Ultrafast spectrometers were acquired with funding from NSF MRI Award DMR-0922929.

 

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