Femtosecond Visible Transient Absorption Spectrometer (Ultrafast Systems Helios)
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.