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(Color online) Experimental setup.
(Color online) A frequency map describing the motion of the WGM spectrum of a magnesium doped resonator. The plot density corresponds to the coupling efficiency of light to the mode. The darker the color, the better is the coupling. Examples of the resonator spectrum at different moments of time are shown in Fig. 3. The resonator was exposed to ultraviolet light for an hour after the light induced mode motion was nearly saturated. The mode motion started again with the initial speed after the UV light illumination. The temperature of the resonator was actively stabilized.
(Color online) Segments of the WGM spectrum for different times. One can see that the spectrum changes with time. The picture corresponds to the frequency map shown in Fig. 2. The better is the coupling, the smaller is the output power. The ideal, so-called critical, coupling corresponds to the complete power absorption in the resonator.
(Color online) A modification of a fragment of the spectrum of the resonator at different moments of time. Relative mode motion could be seen. The average input power for the mode noted as the “mode A” is a product of the input light power, mode contrast, and the relative time that the frequency scanned laser light interacts (is resonant) with the mode. This value shows the amount of the power scattered by the mode A per unit time.
(Color online) A frequency map describing the motion of the WGM spectrum of a resonator made of nominally pure congruent lithium niobate. The plot density corresponds to the coupling efficiency of the light to the mode. The different speeds of the frequency drift for different modes are clearly seen on the picture. The temperature of the resonator was not stabilized.
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