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.
A diffractive-optic unstable resonator for low-gain lasers
1999-01-01
179042 byte
Conference paper
Electronic Resource
English
A diffractive-optic unstable resonator for low-gain lasers
British Library Conference Proceedings | 1999
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