Abstract

Coherent Beam Combining is an alternative approach to the construction of high-power lasers, which mitigates the thermo-optic problems occurring in the classic laser construction [1]. However, phased array requires the control of a larger number of parameters, which results in easier beam quality degradation. The most important are phase mismatch (piston error) and tilt error, which cause energy spreading into the side lobes and distortion of the main lobe in far-field intensity pattern. To achieve effective combining, piston and tilt error must be controlled with accuracy to fraction of wavelength [2].

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