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We show that high-Q modes in a strongly deformed microcavity can be efficiently excited by free-space resonant pumping. We observed that the far-field pattern of cavity transmission is changed when a probe laser is resonant with a scar mode, which can be excited by free-space optical pumping. By measuring the difference between the pump-beam transmission in the nonresonant pumping and that in the...
We report experimental study on the evolution of the emission mechanism by using a phase-space imaging technique based on the local angular momentum conservation in emission process in a chaotic optical microcavity as the cavity deformation corresponding to nonintegrability increases. In the regime of weak deformation, we could image the output beam being emitted tangentially from a location at a...
We have demonstrated free-space resonant coupling with a two-dimensional deformed microcavity made of a liquid jet of ethanol doped with laser dye. The pumping efficiency was obtained from the measurement of threshold pump power. We have achieved a thousand-fold enhancement in the pumping efficiency.
We have developed a new surface boundary profiling technique based on forward shadow diffraction that satisfies both requirements of high-precision and applicability for soft columnar objects and have measured the boundary shape of a microscopic liquid jet two-dimensional microcavity with it. We established a reciprocal relation between the forwardly-projected width of an opaque object and the angular...
We have demonstrated an efficient nonresonant optical pumping scheme for high-Q scar modes in a two-dimensional quadrupole-deformed microlaser. We could obtain the dependence of pumping efficiency on the pumping angle from the cavity-modified fluorescence and from the measurement of threshold pump, which is inversely proportional to the pumping efficiency. Up to three-fold enhancement in the pumping...
The characteristics of quasi-bound states of a highly deformed microcavity were investigated in both theory and experiment. Five distinct mode groups were observed with cavity quality factors different by several orders of magnitude in the range of 104 - 106. Consistently they had quite different intracavity mode distributions. However, their far-field emission patterns were found to be almost identical,...
It is crucial to know how to determine the direction of far-field emission in deformed microcavities. We review the recent advances on this issue focusing on our works. To realize a microlaser with extremely large Q value, the so-called whispering gallery mode (WGM) in the dielectric cavity with spherical or cylindrical boundary has been extensively investigated. The WGM is a mode generated from the...
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