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Related Experiment Video

Updated: Jan 16, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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High power, dual SWIR-MIR OPCPA source for high-order harmonics generation.

Barry D Bruner1, Raman Maksimenka2, Nicolas Thiré2

  • 1Department of Physics of Complex Systems, Weizmann Institute of Science, 7610001, Rehovot, Israel. barry.bruner@weizmann.ac.il.

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|October 2, 2025
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Summary

We developed a versatile optical parametric chirped pulse amplifier (OPCPA) that provides tunable ultrashort pulses in the short-wave and mid-infrared. This advanced laser source enables optimized high-harmonic generation (HHG) spectroscopy for diverse materials.

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Area of Science:

  • Ultrafast science
  • Strong-field physics
  • Attosecond science

Background:

  • High-harmonic generation (HHG) spectroscopy is crucial for observing ultrafast phenomena.
  • Advances in tunable ultrashort laser sources are needed to study diverse systems.
  • Controlling laser parameters like wavelength, pulse duration, and intensity remains challenging.

Purpose of the Study:

  • To present an advanced optical parametric chirped pulse amplifier (OPCPA) system.
  • To demonstrate simultaneous, independently tunable outputs in the short-wave infrared (SWIR) and mid-infrared (MIR).
  • To showcase the system's utility in optimizing high-harmonic generation (HHG) for various materials.

Main Methods:

  • Utilized a single Yb:YAG laser at 50 kHz to pump the OPCPA.
  • Generated tunable ultrashort pulses in the SWIR (2.1 µm, 1.75 µm) and MIR (2.5–7.6 µm).
  • Tailored laser parameters and employed temporal pulse shaping for optimized HHG and nonlinear effect suppression.

Main Results:

  • Achieved peak powers up to 17 GW in the SWIR and pulse energies up to 57 µJ in the MIR.
  • Demonstrated optimized HHG across a range of band gap energies in solid-state materials.
  • Performed XUV measurements at high repetition rates in the SWIR and suppressed nonlinear effects in the MIR.

Conclusions:

  • The developed OPCPA offers unprecedented control over laser parameters for ultrafast spectroscopy.
  • The system's versatility enables advanced studies in strong-field physics and attosecond science.
  • This technology expands the possibilities for exploring fundamental ultrafast phenomena.