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Updated: May 9, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Pump-controlled directional light emission from random lasers.

Thomas Hisch1, Matthias Liertzer, Dionyz Pogany

  • 1Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10/136, 1040 Vienna, Austria. t.hisch@gmail.com

Physical Review Letters
|July 30, 2013
PubMed
Summary
This summary is machine-generated.

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Researchers can now control random laser emission patterns by shaping the spatial pump distribution. This method allows for customized, highly directional emission, overcoming previous limitations in random laser tuning and control.

Area of Science:

  • * Photonics and laser physics, focusing on random lasers and light-matter interactions.

Background:

  • * Random lasers exhibit irregular and difficult-to-tune angular emission patterns.
  • * Current methods lack precise control over the emission characteristics of random lasers.

Purpose of the Study:

  • * To demonstrate a method for controlling the angular emission pattern of random lasers.
  • * To achieve highly directional emission by actively shaping the spatial pump distribution.

Main Methods:

  • * Detailed numerical calculations were performed to analyze pump-induced emission patterns.
  • * An optimization-based approach was developed to design customized spatial pump profiles.
  • * The study explored both strongly and weakly scattering regimes of random media.

Main Results:

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Related Experiment Videos

Last Updated: May 9, 2026

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Published on: January 28, 2019

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

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  • * Customized pump profiles can overcome the inherent irregularity of random laser emission.
  • * Highly directional emission can be achieved by precisely controlling the pump distribution.
  • * The proposed method enables the shaping of extended lasing modes in weakly scattering media.

Conclusions:

  • * Active shaping of the spatial pump distribution offers precise control over random laser emission.
  • * This technique allows for the realization of predetermined emission patterns, enhancing laser tunability.
  • * The findings advance the development of controllable and directional random laser sources.