Resonance near-degenerate frequency

The near-degenerate frequency resonance consists of several components, 0)2 = oo 1.8 GHz and b 2 = The data shown in Fig. 3... 

At "resonance frequencies" at which the real part of e co), e co), is at or near zero, e"(system move in step with the applied voltage little or no work is returned to the external driving voltage source. The work done by the field degenerates into heat within the sample. 

Fig.5.19a-c. Degenerate mode frequency spectrum of a confocal resonator (d = R) (a), degeneracy lifting in a near-confocal resonator (d = 1.1/ ) (b), and the spectrum of fundamental modes in a plane-mirror resonator (c)... 

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