Department of Complex Matter
Jamova cesta 39, 1000 Ljubljana, Slovenia

Dynamics of Quantum matter

We explore non-equilibrium many-body dynamics in quantum systems that experience symmetry-breaking, topological, or jamming transitions. These systems encompass superconductors, charge-density wave, and magnetic materials.

Experimental Soft Matter Physics

The research is conducted within the “Light and Matter” research program. The interaction of light with matter is one of the most important fields of physics and optical processes are indispensable in many branches of modern industry.

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February 6, 2024
The absence of efficient light modulators for extreme ultraviolet - EUV and X-ray photons considerably limits their real-life application, particularly when even slight complexity of the beam patterns is required. In ...

Home / Facilities & Labs / Ultrafast spectroscopy lab

Ultrafast spectroscopy lab

The lab offers a complete set of setups for the investigation of ultrafast processes in solid systems on time scales down to a few femtoseconds. Various probes ranging from THz, IR, and optical up to extreme UV energies are available. Most of the setups can be operated in transmission and reflection geometries. Optical cryostats provide access to temperatures ranging from 1.5 K up to 350 K.

Location: Room C 210

Contact person: Tomaz Mertelj
tel: +386 1 477 3313

Optical pump-probe and multi-pulse spectroscopy

This extremely low noise (~1E-7) is typically used for quick sample characterization. The pump and the probe beams can be set either to 800 nm or 400 nm. The setup is equipped with a helium-flow cryostat (temperature range 4.2-350 K; transmission and reflection geometry; terminals for electrical connections to the sample).

Additionally to the standard pump-probe, a three-pulse configuration is available.

Broadband probe time-resolved spectroscopy

The setup operates in a standard pump-probe configuration. Its unique property is the broadband “white light” probe, which spans from 400-750 nm. The in-house-built array detector allows for parallel acquisition of multiple wavelengths with a 64-channel digital lock-in detector.

Few-fs pump-probe spectroscopy

The pump-probe setup uses 8-fs pulses from Ti:sapphire oscillator to provide extreme time resolution. Liquid helium flow cryostat cryostat can be used slightly compromising time resolution.

Magneto-optical pump-probe spectroscopy

Two electromagnets are available for time-resolved magneto-optical experiments. In combination with helium flow cryostat, a magnetic field of up to 2T is achievable. Various geometries are available magneto-optical Kerr and Faraday spectroscopy. Magnetic fields of up to 7T and sample temperature down to 1.5K are available in combination with Nanocenter’s superconducting magnet.

Time-resolved Resonant Extreme UV Polarimetry

The EUV beamline is based on the high harmonic generation and covers the spectral range of 30-100 eV. The custom-built polarimetry detector works in a rotating analyzer configuration, providing complete information on the polarization state of the EUV light, reflected off the sample. In-plane and out-of-plane magnetic fields of up to 1.5 T can be applied for measurements of magnetically-ordered samples at room temperature or in combination with helium flow cryostat.

Time domain pump-probe THz spectrometer

The setup is capable of measuring the amplitude transmissivity in the frequency region 200Ghz-2.5 THz. In the pump-probe mode the time evolution of the amplitude transmissivity after excitation with an optical pump pulse on a few picosecond timescale is accessible. Maximum available excitation fluence at the sample is ~10 uJ/cm^2 with the photon energy 1.5 eV.

Optical second harmonic generation

The incident radiation are amplified light pulses originating from the Coherent-Mira Ti:Sapphire laser system (100 fs long, 2 microjoules per pulse at 800 nm).

Second harmonic radiation generated in direction of specular reflection is detected by a photon counting system synchronized with the laser amplification unit. Growth and structure of thin surface layers adsorbed on various kinds of solid substrates can be probed in-situ during deposition from the vapour or liquid phase.