Ultrabroadband two-dimensional electronic spectroscopy in the pump-probe geometry using conventional optics

Area of Science:

• Physical Chemistry
• Spectroscopy
• Quantum Optics

Background:

• Two-dimensional electronic spectroscopy (2D ES) is a powerful technique for studying ultrafast dynamics.
• Conventional 2D ES setups can be complex and require specialized optics.
• Ultrabroadband measurements provide higher resolution for probing molecular motions.

Purpose of the Study:

• To present a simplified approach for ultrabroadband 2D ES using conventional optics.
• To demonstrate the efficacy of the method in analyzing molecular dynamics.
• To facilitate the study of vibrational wave packets and their influence on electronic transitions.

Main Methods:

• Utilized a phase-stabilized Michelson interferometer for pump-pulse delay (τ1).
• Employed spectral resolution of the probe beam for the detection-frequency dimension (ω3).
• Incorporated active phase stabilization using a piezo stage and quadrature feedback from a reference laser.

Main Results:

• Successfully performed ultrabroadband 2D ES measurements using conventional optical components.
• Measured a well-characterized laser dye, reproducing known peak structures.
• Observed modulation of vibronic peaks by vibrational wave packets as a function of waiting time (τ2).

Conclusions:

• The developed interferometer simplifies ultrabroadband 2D ES measurements and analysis.
• This method offers a more accessible route to advanced spectroscopic studies.
• The technique effectively captures dynamic molecular processes influenced by vibrations.