Single-shot dispersion-scan using a combination of prism and grating

Area of Science:

• Ultrafast optics and laser science
• Nonlinear optics and spectroscopy
• Optical metrology and characterization

Background:

• The dispersion-scan (d-scan) technique is crucial for measuring ultrashort laser pulses.
• Existing single-shot d-scan methods face challenges with longer pulse durations (tens of femtoseconds) due to increasing dispersion range requirements.
• The required dispersion range scales quadratically with the Fourier Transform Limit (FTL), posing a significant technical hurdle.

Purpose of the Study:

• To develop a modified single-shot dispersion-scan technique for measuring tens of femtoseconds laser pulses.
• To overcome the limitations of conventional d-scan methods for longer pulse durations.
• To introduce a novel optical component for enhanced dispersion measurement capabilities.

Main Methods:

• Implementation of a grism, combining a zinc sulfide prism and a transmission grating, for pulse characterization.
• Utilizing the grism to achieve a dispersion range window of 3200 fs^2.
• Demonstration of the technique by characterizing 25 fs Fourier Transform Limit (FTL) pulses with varying spectral phases.

Main Results:

• Successful characterization of tens of femtoseconds laser pulses using the novel grism-based d-scan method.
• The new technique maintains the principle of single-shot d-scan without requiring modifications.
• Experimental results were validated by comparison with conventional d-scan measurements.

Conclusions:

• The developed grism-based d-scan technique effectively measures ultrashort laser pulses with durations of tens of femtoseconds.
• This method provides a practical solution for overcoming dispersion limitations in longer pulse measurements.
• The grism offers a significant advancement in ultrafast laser pulse characterization.