Extends the capabilities of HARPIA-TA system

. Third Beam Delivery Extension HARPIA-TB.

Third Beam Delivery Extension

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Features

  • Extends the capabilities of HARPIA‑TA system
  • Provides an additional dimension to pump‑probe measurements
  • Provides additional insight to complex photodynamic systems

Overview

  • Extends the capabilities of HARPIA‑TA system
  • Can be installed as an add-on to an already existing HARPIA‑TA mainframe basis
  • Provides an additional dimension to pump‑probe measurements
  • Provides additional insight to complex photodynamic systems
  • Full control of the third beam:
    • Polarization (manual or automated Berek variable waveplate in the third beam path);
    • Intensity (continuously variable neutral density filters in the third beam path with automated version available);
    • Delay (the auxiliary laser pulse is delayed in an optical delay line with full delay ranging from 1.3 to 2.6 ns)
  • Data analysis software for inspecting the acquired multi‑pulse data and performing global and target analysis

 

When standard spectroscopic techniques are not enough to unravel the intricate ultrafast dynamics of photoactive systems, multi-pulse time-resolved spectroscopic techniques can be utilized to shed additional insight. HARPIA‑TB is a third beam delivery unit for the HARPIA‑TA mainframe system that adds an additional dimension to typical time resolved absorption measurements. A temporally delayed auxiliary (third) laser pulse, as depicted below, can be applied to a typical pump-probe configuration in order to perturb the on-going pump-induced photodynamics.

An auxiliary pulse resonant to a stimulated emission transition band can deliberately depopulate the excited state species and thereby revert the excited system back to the ground state potential energy surface. This type of experiment is usually referred ad pump-dump-probe (PDP).

When the wavelength of the third pulse corresponds to an induced absorption resonance, the pulse is thus able to elevate the system to a higher excited state (that may or may not be detectable in the standard photoevolution) or return it to an earlier evolutionary transient. This type of measurement is typically referred as pump-repump-probe (PrPP).

When the auxiliary pulse is resonant to an electronic ground-to-excited state transition, i.e., S0 to Sn, it makes it possible to either “replenish” the excited state population or to prepare a small portion of excited state population before the “main” pump pulse. This type of measurement is typically referred as prepump-pump-probe (pPPP).

Since both probe and the auxiliary pulse can be delayed in time in respect to one another, both kinetic trace and action trace experiments can be performed with a HARPIA‑TB setup. In other words, we can obtain either the information on how a perturbation disturbs the standard photodynamic behavior of the investigated system (when the probe pulse is propagated in time), or we can monitor how the exact timing of perturbation influences the transient absorption spectrum at a fixed evolutionary phase system (when the auxiliary pulse is propagated in time).

Moreover, HARPIA‑TB can be utilized to deliver frequency-narrowed (i.e., picosecond) pulses, thus providing the capability to perform time-resolved femtosecond stimulated Raman scattering (FSRS) spectroscopic measurements.

HARPIA-TB Third Beam Delivery Extension. Product datasheets. Version 26/01/2018, 1.66 MB.
HARPIA Femtosecond Extended Spectroscopic Systems. Product datasheets. Version 26/01/2018, 3.49 MB.
Ultrafast Lasers, 2018. Products catalogue. Version 24/09/2018, 6.56 MB.
超快激光 2018. Products catalogue in Chinese. Version 24/09/2018, 7.26 MB.

Products List

Extends the capabilities of HARPIA-TA system

. Third Beam Delivery Extension HARPIA-TB.