Helios Femtosecond Transient Absorption Spectrometer and Halcyione Spectrofluorimeter Ultrafast Systems

HELIOS is a CCD-based broadband pump-probe femtosecond Transient Absorption Spectrometer Helios, used for monitoring extremely short-lived optically
absorbing states. The experimental time window ranges from femtoseconds to nanoseconds. Helios is designed to work with amplified femtosecond lasers for application in Photophysics, Photochemistry,
Materials science, Nanoscience, Transient spectrometry, and many more areas.
Halcyone is a Femtosecond Fluorescence Upconversion Kinetic Spectrometer with luminescence detection range 400 nm – 1600 nm (depends on the excitation and gate wavelengths). HALCYONE is be equipped with a TCSPC add-on for extending its time window.

Nome e marca dello strumento Helios Femtosecond Transient Absorption Spectrometer and Halcyione Spectrofluorimeter Ultrafast Systems
Ubicazione Lab. of Prof. R. Tommasi, Dept of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari, P.zza G. Cesare 11 Bari
Anno fabbricazione/installazione 2012
Descrizione caratteristiche operative The laser system of the lab is composed of:
a diode-pumped Ti:Sapphire femtosecond oscillator (Mai Tai, Spectra Physics),
a regenerative Ti:Sapphire amplifier (Spitfire Pro, Spectra Physics), pumped by a Q-switched Nd3+:YLF laser (Empower, Spectra Physics), an OPA (optical parametric amplifier, TOPAS-C, Spectra Physics) tunable in a broad spectral range (290−2600 nm).Helios Specifications:
Low profile direct-drive ultra-high speed optical delay line integrated in the spectrometer housing.
Time window: 3 ns
Resolution: 14 fs
Minimum step size: 2.8 fs
Max. speed: >10 ns/s
Acceleration: > 260 ns/s^2
Temporal Resolution. The instrument response function is a cross-correlation of the pump and probe pulses. The typical HELIOS IRF is 1.4 times longer than the laser’s fundamental pulse duration.
Probe spectral range 450-800 nm and 800-1600 nm
Spectral Resolution VIS 2 nm and NIR 5 nmHalcyone Specifications:
Spectral range:
– Upconversion mode: 320-1600 nm
– TCSPC mode: 400-900 nm
– Upconversion mode: 3.3 ns
– TCSPC mode: from 15nsec to 1msec
Time resolution
– Upconversion mode: correlate to the pulse lenght
– TCSPC mode: 200 ps
Campi di applicazione The Helios Transient Absorption Spectrometer has several application such as:
Non-radiative transitions and excited state dynamics
Blinking in fluorescence
Material properties of metal nanoparticles
Photochemistry of Vis and NIR emitting quantum dots
Non-linear absorption and optical limiting in the near infrared
Surface plasmon resonance of metal nanoparticles
Quantum confinement in optically excited materialsHalcyone Spectrofluorimeter:
Electronic deactivation
Solvation dynamics
Energy transfer
Intersystem crossing
Vibrational relaxation
Internal conversion
Electron transfer, etc
Nome e Cognome Raffaele Tommasi
Email raffaele.tommasi@uniba.it
Telefono +39 080 5448561