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Related Concept Videos

Beams01:30

Beams

1.9K
Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition.
Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...
1.9K
Deflection of a Beam01:19

Deflection of a Beam

756
Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
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Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

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In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the...
481
Principal Stresses in a Beam01:11

Principal Stresses in a Beam

758
In prismatic beams subject to arbitrary transverse loading, It is essential to analyze the interaction between shear forces and bending moments in order to understand stress distribution and ensure structural integrity. The highest normal or bending stress occurs at the outer fibers of the beam, decreasing linearly to zero at the neutral axis. In contrast, shear stress peaks at the neutral axis and diminishes toward the outer surfaces.
Analyzing principal stresses is crucial, especially in...
758
Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

432
The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
432
Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

450
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
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Related Experiment Video

Updated: Feb 14, 2026

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

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Reshaping a multimode laser beam into a constructed Gaussian beam for generating a thin light sheet.

Saiedeh Saghafi1,2, Nikoo Haghi-Danaloo1, Klaus Becker1,2

  • 1Department of Bioelectronics, FKE, Vienna University of Technology-TU Wien, Vienna, Austria.

Journal of Biophotonics
|February 20, 2018
PubMed
Summary

Researchers developed a method to reshape multimode diode-pumped solid-state (DPSS) laser beams into a quasi-Gaussian beam. This technique creates a thinner light sheet for ultramicroscopy with reduced side shoulders.

Keywords:
Light sheet microscopyconstructed gaussian beamlaser beam shapinglight sheet generatormultimode laser

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Microscopy

Background:

  • Diode-pumped solid-state (DPSS) lasers often emit multimode beams.
  • Characterizing and controlling these multimode beams is crucial for advanced applications like ultramicroscopy.
  • Existing methods for generating light sheets may suffer from undesirable features like side shoulders.

Purpose of the Study:

  • To develop a method for optically reshaping multimode DPSS laser beams.
  • To create a thin, high-quality light sheet for ultramicroscopy.
  • To compare the generated light sheet with one directly from a DPSS multimode laser.

Main Methods:

  • Modal analysis to model the multimode laser beam.
  • Near-field and far-field measurements to determine individual mode contributions and optical parameters.
  • Optical reshaping using a mode modulator with meso-aspheric elements and a soft aperture.
  • Generation of a light sheet using achromatic-aspheric elements.

Main Results:

  • Successfully modeled the output beam of a DPSS multimode laser.
  • Optically reshaped the multimode beam into a quasi-Gaussian beam.
  • Generated a light sheet for ultramicroscopy that is markedly thinner.
  • Observed significantly reduced side shoulders in the generated light sheet compared to direct generation.

Conclusions:

  • The developed modal analysis and beam reshaping technique effectively controls multimode laser beams.
  • The quasi-Gaussian beam conversion enables the generation of superior light sheets for ultramicroscopy.
  • This method offers an improvement over direct generation of light sheets from DPSS multimode lasers.