Single-shot d-scan technique for ultrashort laser pulse characterization using transverse second-harmonic generation...

Area of Science:

• Optics and Photonics
• Ultrafast Laser Science
• Nonlinear Optics

Background:

• Accurate temporal characterization of ultrashort laser pulses is crucial for many scientific applications.
• Existing methods for pulse characterization can be complex or lack single-shot capabilities.

Purpose of the Study:

• To introduce a novel, simplified, and robust single-shot dispersion-scan (d-scan) technique for ultrashort laser pulse characterization.
• To validate the performance of the new d-scan method against established techniques.

Main Methods:

• Development of a new d-scan scheme utilizing a specialized nonlinear crystal with antiparallel domains.
• The crystal acts as both the dispersive element and nonlinear medium for transverse second-harmonic generation.
• Implementation of an in-line architecture for real-time data acquisition.

Main Results:

• Demonstration of single-shot d-scan trace acquisition in real time.
• Excellent agreement between pulse profiles retrieved by the new d-scan and frequency-resolved optical grating (FROG) measurements.
• Successful application to a terawatt-class laser system with a programmable pulse shaper, confirming accurate dispersion retrieval.

Conclusions:

• The novel d-scan scheme offers a simple, robust, and real-time solution for ultrashort laser pulse temporal characterization.
• This technique is suitable for advanced laser systems, including those with pulse shaping capabilities.
• The method provides reliable dispersion measurements, validated by independent techniques.