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Related Experiment Video

Updated: Nov 10, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Published on: January 28, 2019

Spectrally resolved point-spread-function engineering using a complex medium.

Antoine Boniface, Mickael Mounaix, Baptiste Blochet

|April 6, 2021

Summary

This summary is machine-generated.

Researchers engineered light pulses using the multi-spectral transmission matrix (MSTM) to control focusing in scattering media. This technique allows precise spatial and spectral shaping of light for applications like multiphoton microscopy.

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Area of Science:

Optics and Photonics
Light Scattering
Wavefront Engineering

Background:

Ultrashort light pulses propagating through scattering media create complex spatio-spectral speckle patterns.
The multi-spectral transmission matrix (MSTM) mathematically describes this light-scattering phenomenon.
Spatial light modulators (SLMs) can manipulate light fields.

Purpose of the Study:

To demonstrate engineering of the focused light beam's point-spread function (PSF) both spatially and spectrally.
To utilize the measured MSTM for precise light manipulation.
To present a novel method for simultaneous spatial and temporal focusing.

Main Methods:

Measurement of the multi-spectral transmission matrix (MSTM) for a scattering medium.
Numerical filtering of the spatial content within the MSTM at each wavelength.
Using a spatial light modulator (SLM) to shape the wavefront of the ultrashort pulse based on the filtered MSTM.

Main Results:

Demonstrated precise control over the spatial and spectral characteristics of the focused light beam.
Successfully engineered the point-spread function (PSF) of the focused light.
Showcased the technique's versatility through experimental examples.

Conclusions:

The developed method offers an alternative to simultaneous spatial and temporal focusing.
This technique has potential applications in advanced imaging modalities such as multiphoton microscopy.
Precise control over light propagation through scattering media is achievable via MSTM engineering.