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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...

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Related Experiment Video

Updated: Jun 16, 2026

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
09:01

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Published on: April 4, 2017

Thermal-blooming compensation: experimental observations using a deformable-mirror system.

C A Primmerman, D G Fouche

    Applied Optics
    |February 19, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Researchers used a deformable mirror to correct phase distortions in laser beams, significantly improving focus under thermal blooming conditions. This method boosts peak irradiance by threefold, overcoming challenges in forced-convection-dominated environments.

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    Last Updated: Jun 16, 2026

    Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
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    Published on: April 4, 2017

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    Area of Science:

    • Laser physics
    • Optical engineering
    • Fluid dynamics

    Background:

    • Forced-convection-dominated thermal blooming distorts laser beams, reducing their effectiveness.
    • Compensating for thermal blooming is crucial for high-power laser applications.

    Purpose of the Study:

    • To demonstrate the effectiveness of phase correction using a deformable mirror to mitigate thermal blooming.
    • To experimentally validate theoretical predictions for irradiance enhancement.

    Main Methods:

    • A laboratory experiment was conducted using a deformable mirror to introduce phase corrections.
    • Laser beam propagation through a medium with forced-convection-dominated thermal blooming was studied.

    Main Results:

    • The deformable mirror successfully compensated for thermal blooming effects.
    • Peak focal-plane irradiance was increased by a factor of 3 under severely bloomed conditions.

    Conclusions:

    • Phase correction with a deformable mirror is an effective method to counteract thermal blooming.
    • Experimental results align with theoretical predictions, confirming the technique's viability.