By using nonlinear coupled mode equations, we numerically investigated the generation of a Kerr comb in a normal dispersion microcavity system, where mode coupling between two cavity modes is present. In contrast to previous studies, our model is rigorous in which we fully considered the mode coupling between two modes. We investigated the phase matching condition to obtain the suitable parameters needed to form a free-spectral-range (FSR)-selectable comb. Our calculations are in good agreement with existing experimental results, and enable us to obtain a good understanding of the phenomenon; moreover our model also allows us to reveal new phenomena. We investigated 1-FSR comb generation in detail and found that randomly oscillating behavior will appear when detuning is scanned, which has never before been clearly observed. This modeling approach will be a powerful tool that will assist dispersion engineering for Kerr comb generation and the frequency tuning needed to generate a deterministic mode-locked comb.
We study the impact of inherent mode coupling between clockwise (CW) and counter-clockwise (CCW) modes on Kerr comb generation in a small whispering-gallery mode microcavity. Our numerical analysis using a coupled Lugiato-Lefever equation reveals the range of the coupling strength in which a soliton pulse can be obtained in the CW direction. It also showed that CCW comb power depends on the coupling strength between the CW and CCW modes. In addition to the simulation, we conducted an experiment to confirm that the power ratio between the CW and CCW comb modes depends on the coupling strength, and the experimental results agree well with the simulation results. This study helps us to understand the relationship between CW and CCW mode coupling and Kerr comb generation, and the effect on soliton formation.
Assemlbing behaviors of some crown ether derivatives with alkyl chains were investigated. It was found that a phthalhydrazide derivative was unique among them in that it assembles into fibers in solution, which transform into microbelts on the surface of highly oriented pyrolytic graphite.
The purpose of this paper was to consider the image of woman physical educator in the secondary school at the Meiji era. It is generally agreed that the evaluation of the woman physical educator was lower than the other woman during the prewar period. On the contrary, it is clear that the highly educated woman became a physical educator. These two facts are mutually incompatible. The question now arises: is it true that the evaluation of the woman physical educator of secondary school was lower than the other woman? Three points seem to be helpful in attempting to sketch out that question: (1) the aspects of the academic evaluation of physical education for female; (2) the social status of woman physical educator; (3) the human relations of teachers in the secondary school.Result of consideration, the image of woman physical educator has been molded by many reasons. One is that the unfavorable view of female's physical activity and exercise. Another reason is the low opinion for women educator. Added to these reasons, the academic evaluation of physical education for female was an important factor.These results lead to the conclusion that the social status of the woman physical educator was not necessarily lower than the other women.
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