Universal in-line waveform characterization using arbitrary nonlinear responses.

Area of Science:

• Ultrafast Science and Spectroscopy
• Quantum Optics and Photonics
• Nonlinear Optics and Materials

Background:

• Current waveform-resolved characterization methods are limited by setup-specific constraints, hindering routine diagnostics.
• Lack of standardized, adaptable procedures impedes widespread adoption in ultrafast science.
• Existing techniques often require complex setups and are not easily integrated into experiments.

Purpose of the Study:

• To develop and demonstrate a universal, low-cost, and non-intrusive scheme for ultrashort pulse characterization.
• To establish a robust framework for routine in-line diagnostics of optical waveforms.
• To make advanced pulse characterization techniques accessible to the broader ultrafast science community.

Main Methods:

• Utilized relative yield measurements across diverse media and nonlinear observables.
• Employed a suite of open-source reconstruction algorithms: CRIME, twinCRIME, and lazyCRIME.
• Adapted the framework for non-invasive, simultaneous waveform characterization within attosecond transient absorption spectroscopy (ATAS) experiments.

Main Results:

• Achieved robust waveform retrieval with attosecond accuracy using standard computational resources.
• Demonstrated rapid characterization, completing measurements in minutes.
• Successfully implemented the scheme in multiple experimental configurations, including ATAS.

Conclusions:

• The developed framework offers an easy-to-implement, universal characterization scheme for ultrashort pulses.
• This approach significantly enhances the adaptability and accessibility of in-line diagnostics.
• The method provides a cost-effective and non-intrusive solution for routine ultrafast pulse analysis.