2D IR spectroscopy at 100 kHz utilizing a Mid-IR OPCPA laser source

Area of Science:

• Physical Chemistry
• Spectroscopy
• Nonlinear Optics

Background:

• Two-dimensional infrared (2D IR) spectroscopy is a powerful technique for studying molecular dynamics.
• High repetition rate systems are crucial for efficient data acquisition in 2D IR spectroscopy.

Purpose of the Study:

• To develop and demonstrate a high-repetition-rate (100 kHz) 2D IR spectrometer.
• To enable faster and more efficient collection of 2D IR spectroscopic data.

Main Methods:

• Utilized a ytterbium (Yb) fiber oscillator as a common source for pump and seed beams.
• Employed MgO:PPLN optical parametric amplifier of pumped by an amplifier (OPCPA) for wavelength generation.
• Generated 4.65 μm pulses using a ZGP difference frequency generation (DFG) stage.
• Incorporated a mid-infrared pulse shaper for precise control of excitation pulses.

Main Results:

• Successfully implemented a 100 kHz 2D IR spectrometer system.
• Demonstrated the capability for high-repetition-rate data acquisition.
• The system integrates an Yb fiber oscillator, cryocooled Yb:YAG amplifiers, OPO, MgO:PPLN OPCPA, ZGP DFG, and a mid-IR pulse shaper.

Conclusions:

• The developed 100 kHz 2D IR spectrometer significantly advances the speed of vibrational spectroscopy.
• This system opens new possibilities for time-resolved studies of ultrafast molecular processes.
• The integrated approach provides a robust platform for advanced spectroscopic investigations.