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Gargantua - ultafast high energy femtosecond beamline

Multimodal laser system conisit of both high repetition rate oscillator (MaiTai HP, 3 W, <80 fs) and low repetition rate amplifier (Spitfire Ace, 1kHz, 100 fs, >7W). These repetition rate permit both a wide variety of ultrafast spectroscopy experiments in the UV/Vis/NIR/MIR range and THz pulses.

The fundamental beam is split into four parts. Two of the resulting beams are used to pump two optical parametric amplifiers (OPA, Lightconversion TOPAS Prime™) for generating broadband optical pulses, tunable over the extended range from 280 to 2700 nm. In combination with difference frequency mixing, the accessible range is extended up to 20 μm (>10 μJ @ 15 μm).

Four high energy pulses are available: 2 pump beams fixed at 800 nm and 2 converted beams that are independently tunable over the 280 to 2700 nm range and one up to 20 μm. The temporal pulse width after each OPA is controlled by a prism compressor to compensate for setups dispersion.

 

   
 

Ultrafast transient absorption spectroscopy

The setup is highly versatile and flexible and can be easily configured for different optical techniques. In general, in transient absorption experiments the pump pulse interacts with the system of interest, after which the transient absorption change in the sample is monitored by a time-delayed probe beam. The transient absorption spectrum contains clues to both structural information and dynamics. The TAS device can operate in two spectral regimes covering probe wavelengths from 400 nm to 800 nm or 800 nm to 1600 nm. The optical delay line provides femtosecond temporal resolution over a range as wide as 3.2 ns. The direct output of the OPA’s can also be coupled into the spectrometer, thus extending the operation spectral range all the way to MIR region.

 

 

   
 

Thor - THz optical rectificator, time-domain THz spectroscopy

This beamline employ high energy THz generated in ZnTe through optical rectification of the 800 nm input lightand and air plasma using both 800 nm and 400 nm pulses. The evolution of pulsed THz electric fieldill be detected by electro-optical sampling, by combining the THz radiation with optical gate/sampling pulse of 800 nm wavelength in ZnTe nonlinear crystal. The spectral range covers 0.3 THz - 5 THz (ZnTe) and up to 11 THz (air plasma) with the strength of the THz field at maximum to be of the order of 1MV/cm.

Third fully tunable pulse from OPA (Topas, Light Conversion, 250 nm - 2700 nm) is used to provide fully flexible in energy time-domain THz spectroscopy experiments.

 

 

   
 

Truffle - time-resolved ultrafast fluorescence experiments

The setup supports ultrafast fluorescence experiments that probe luminescence dynamics at ultrafast time scales. In these experiments, the fluorescence emission from the chromophore is collected and focused on a nonlinear BBO crystal, where it is mixed with a second femtosecond pulse at 800 nm (called the gate pulse) which arrives at a given time delay. The mixing of the fluorescence light with the gate pulse gives rise to the sum frequency of the two, which can be detected with a CCD-based spectrograph. The delay of the gate with respect to the pump pulse can be continuously tuned which allows recordings of the temporal evolution of the sample.

The system is also equipped with Time-Correlated Single Photon Counting for measurement up to 13 ns time with 100 ps resolution. The TCSPC electronics is available for both MHz and kHz repetition rates. The TCSPC method is highly sensitive, so this will work well even for weak signals.

 

   
 

Curious Molly - multi-modal nonlinear microscope

Curious Molly is multi-modal nonlinear optical microscope that is tailored for the characterization and fabrication of micro- and nano-structured materials. The multimodal microscopy system is interfaced with Gargantua - High Energy Ultrafast Beamline - high energy multi-laser system, which produces ultrashort femtosecond pulse trains that can be tuned from the ultraviolet to the THz range, fulfilling the illumination needs of virtually every linear and nonlinear experiment. Curious Molly will full control for beam manipulation at the micro scale, enable conventional fluorescence experiments (single and multi-hoton), time-resolved pump-probe, stimulated Raman scattering (SRS), two-photon absorption (TPA) and time-resolved fluorescence (TRFL) experiments with various detection modes. In addition, the system will be outfitted with modules for the detection of second-harmonic generation (SHG), third-harmonic generation (THG), sum-frequency generation (SFG), and coherent anti-Stokes Raman scattering (CARS).