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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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69% Efficient continuous-wave second-harmonic generation in lithium-rich lithium niobate.

D H Jundt, M M Fejer, R L Byer

    Optics Letters
    |September 29, 2009
    PubMed
    Summary

    Lithium-rich lithium niobate crystals efficiently doubled the frequency of a laser, achieving high power with no damage. This demonstrates a robust method for generating visible light from infrared lasers.

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    Area of Science:

    • Materials Science
    • Optics and Photonics
    • Nonlinear Optics

    Background:

    • Frequency doubling is crucial for generating visible light from infrared lasers.
    • Lithium niobate (LiNbO3) is a key material for nonlinear optical applications.
    • Photorefractive damage can limit the performance of nonlinear optical devices.

    Purpose of the Study:

    • To investigate the use of lithium-rich lithium niobate for efficient second-harmonic generation.
    • To achieve high power output at the doubled frequency.
    • To assess the material's resistance to photorefractive damage.

    Main Methods:

    • Fabrication of lithium-rich lithium niobate crystals using vapor transport equilibration.
    • Utilizing an injection-locked Nd:YAG laser as the fundamental light source.
    • Employing resonant external cavity second-harmonic generation.

    Main Results:

    • Achieved internal doubling efficiencies as high as 69%.
    • Generated output powers up to 1.6 W.
    • Observed no evidence of photorefractive damage at 234 degrees C.

    Conclusions:

    • Lithium-rich lithium niobate is a highly effective material for efficient frequency doubling.
    • Resonant external cavity configurations enable high-power second-harmonic generation.
    • The material exhibits excellent photorefractive damage resistance at elevated temperatures.