Diffraction power losses for tilted (open) resonators with both circular and strip flat reflectors are computed for several tilt angles by means of a second-order perturbation technique. Results indicate that the power losses increase as the square of the perturbation parameter. The strips exhibit a greater additional power loss per transit for the TEM0 mode than for the TEM1 mode; the opposite is true in the case of the circular disks. Results are applied to the He–Ne 6328-Å line.
© 1980 Optical Society of America
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