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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

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Foam-based optical absorber for high-power laser radiometry.

Krishna Ramadurai1, Christopher L Cromer, Xiaoyu Li

  • 1Department of Mechanical Engineering, 427 UCB, University of Colorado, 1111 Engineering Drive, Boulder, CO 80309, USA. krishna.ramadurai@gmail.com

Applied Optics
|December 7, 2007
PubMed
Summary
This summary is machine-generated.

Novel liquid-cooled silicon carbide and vitreous carbon foams show high damage thresholds up to 1.6x10^4 W/cm^2. These advanced absorbers maintain 96% absorbance at 1.064 micrometers, indicating potential for demanding laser applications.

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Area of Science:

  • Materials Science
  • Laser-Material Interactions
  • Thermal Engineering

Background:

  • High-power laser systems require robust optical absorbers.
  • Existing absorbers face limitations in thermal management and damage resistance.
  • Novel foam materials offer potential for enhanced performance.

Purpose of the Study:

  • To measure the damage thresholds of novel liquid-cooled silicon carbide and vitreous carbon foam absorbers.
  • To investigate the influence of water flow velocity and absorbance on damage threshold.
  • To elucidate the damage mechanism in these foam absorbers.

Main Methods:

  • Damage threshold measurements were conducted on silicon carbide and vitreous carbon foam absorbers.
  • Absorbance was measured at 1.064 micrometers.
  • Water flow velocity effects on damage threshold were systematically studied.
  • Qualitative analysis of the damage mechanism was performed.

Main Results:

  • Damage thresholds reached up to 1.6x10^4 W/cm^2.
  • Absorbance of 96% at 1.064 micrometers was achieved.
  • Damage threshold varied with water flow velocity.
  • A two-phase heat transfer mechanism was proposed for foam-water interaction.

Conclusions:

  • Liquid-cooled silicon carbide and vitreous carbon foams exhibit high laser damage thresholds.
  • These materials demonstrate excellent absorbance properties for laser applications.
  • Understanding the heat transfer mechanisms is crucial for optimizing absorber performance and preventing damage.