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The magnitude of the diffraction loss depends on the geometric dimensions of the resonator, the type of field distribution.
The mode distribution coincides with the field distribution in the waveguide:
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if the field is round, it is described by the Bessel formulas, - wave numbers, n, m - the number of field variations along x or y.
, .
, .
- the number of Frinel.
Obviously, with increasing cavity length, diffraction losses increase. With an increase in a (mirror size), diffraction losses will decrease.
Diffraction mode loss in an open resonator.
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,
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Singlemode mode is achieved by changing the aperture.
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Quantum electronics
Terms: Quantum electronics