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Related Experiment Video

Updated: May 23, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

Reconfigurable wavefront sensor for ultrashort pulses.

Martin Bock¹, Susanta Kumar Das, Carsten Fischer

¹Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Berlin, Germany.

|April 3, 2012

Summary

This study introduces a flexible Shack-Hartmann wavefront sensor for ultrashort pulse diagnostics. The system achieves high-quality measurements using nondiffracting needle beams, even at steep angles and with 6 fs pulses.

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$Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing$

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing

Published on: April 25, 2019

Area of Science:

Optics and Photonics
Ultrafast Science
Wavefront Sensing

Background:

Shack-Hartmann wavefront sensors are crucial for optical system characterization.
Diagnosing ultrashort laser pulses presents unique challenges due to their short duration and high peak power.

Purpose of the Study:

To develop and characterize a highly flexible Shack-Hartmann wavefront sensor for ultrashort pulse diagnostics.
To investigate the temporal system performance and explore reflective operation capabilities.

Main Methods:

Utilized a liquid-crystal-on-silicon spatial light modulator programmed with tilt-tolerant microaxicons.
Generated nondiffracting needle beams as subbeams for nearly undistorted pulse transfer.
Evaluated system performance at various incident angles and with ultrashort pulse durations.

Main Results:

Demonstrated reproducible wavefront analysis and spatially resolved second-order autocorrelation.
Achieved successful operation at incident angles up to 50 degrees.
Validated performance with pulse durations as short as 6 femtoseconds.

Conclusions:

The developed Shack-Hartmann sensor offers high flexibility for ultrashort pulse diagnostics.
The use of microaxicon-generated needle beams enables robust and accurate wavefront measurements.
The system shows significant potential for advanced ultrafast optical metrology.