Unstable optical resonators have been found to be very useful in applications where large fundamental mode volume and good higher-order mode discrimination are required. Gaussian-reflectivity mirrors (GRMs) are commonly used as output couplers to improve the far-field pattern of unstable resonators. We have shown that GRM unstable resonators can be designed to produce flat near-field output beams even when the central reflectivity of the GRM is higher than the conventional l/m/sup 2/ value. This is accomplished by altering the internal Gaussian mode using a custom-made diffractive optical element. This allows for maximally flat output beams from high-magnification and low-gain laser systems.


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    Title :

    A diffractive-optic unstable resonator for low-gain lasers


    Contributors:
    Makki, S. (author) / Leger, J. (author)


    Publication date :

    1999-01-01


    Size :

    179042 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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