Abstract
The output fareld intensity distributions of o -axial cylindrical hybrid resonator with di erent mirror misalignments are simulated by coordinate transformation fast Fourier-transform algorithm. The simulations showed that the mirror misalignments in uence is di erent in anticlockwise and clockwise tilt direction. According to the calculation results, the output beam quality of o -axial unstable resonator is analyzed, from the aspects of M value and power in the bucket curves. Furthermore, the analysis brings out an interesting contradiction that the beam quality changing evaluated byM value is di erent from that by power in the bucket curves when the mirror misalignments occurred in anticlockwise direction. It demonstrated that the beam quality evaluation of o -axial unstable resonator should not be one-sided.
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