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Updated: May 25, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
10:17

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ASE in thin disk lasers: theory and experiment.

P Peterson1, A Gavrielides, T C Newell

  • 1Boeing LTS Inc., Kirtland Air Force Base, NM, USA.

Optics Express
|January 26, 2012
PubMed
Summary
This summary is machine-generated.

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Researchers developed equations for amplified spontaneous emission (ASE) intensity and heat load in Yb:YAG disk lasers. They experimentally determined the gain length, finding it to be 43% of the pump spot size.

Area of Science:

  • Laser Physics
  • Materials Science

Background:

  • Amplified Spontaneous Emission (ASE) is a critical factor affecting laser performance and efficiency.
  • Understanding and mitigating ASE is essential for optimizing high-power laser systems.

Purpose of the Study:

  • To derive theoretical equations for ASE intensity, decay time, and heat load in Yb:YAG disk lasers.
  • To experimentally determine the gain length and its relationship with pump power and spot size.

Main Methods:

  • Frequency and spatial integration over gain lineshapes and emitters to derive ASE equations.
  • Experimental measurement of gain as a function of incident pump power for a multi-pass pumped Yb:YAG disk laser.
  • Fitting experimental gain data to theoretical models to extract gain length.

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Main Results:

  • Developed equations for ASE intensity, decay time, and heat load.
  • Measured gain in a Yb:YAG disk laser (9.8 at.%) with an anti-ASE cap up to 3kW pump power.
  • Extracted gain length, finding it to be 43% of the 7mm pump spot size, with a fit within 10% of measured gain.

Conclusions:

  • The derived equations provide a framework for understanding ASE in Yb:YAG disk lasers.
  • Experimental validation confirms the accuracy of the gain length extraction method.
  • The determined gain length is a key parameter for laser design and performance optimization.