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Distributed aperture effect in laser rods with negative lenses.

N P Barnes, S J Scalise

    Applied Optics
    |March 4, 2010
    PubMed
    Summary

    Negative lenses increase the usable volume of laser rods by creating a distributed aperture. This method enhances the fundamental transverse electromagnetic mode (TEM(00)) volume and reduces diffraction loss.

    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • Conventional laser resonators often face limitations in maximizing the fundamental mode volume.
    • Diffraction losses can restrict the efficiency and output power of lasers.

    Purpose of the Study:

    • To investigate the use of negative lenses on laser rod ends to enhance the transverse electromagnetic mode (TEM(00)) volume.
    • To analyze the impact of this configuration on laser performance, specifically mode radius and diffraction loss.

    Main Methods:

    • Grinding negative lenses onto the ends of laser rods.
    • Modeling the laser rod with end lenses as a distributed aperture.
    • Calculating the distributed aperture radius and its effect on the useful laser rod volume.
    • Determining mode radius and diffraction loss as a function of focal length and Fresnel number.

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    Main Results:

    • The addition of negative lenses effectively transforms the laser rod into a distributed aperture.
    • Calculations provide the distributed aperture radius and its influence on the laser rod's useful volume.
    • The study presents the mode radius and diffraction loss for this configuration.

    Conclusions:

    • Negative lenses on laser rod ends offer a viable method for increasing the TEM(00) mode volume.
    • This technique can potentially improve laser efficiency by managing diffraction losses.
    • The findings provide a basis for designing lasers with enhanced mode volumes.