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- Takahisa Harayama, Takehiro Fukushima, Satoshi Sunada, Kensuke S. Ikeda
- Physical review letters
- 2003

Locking of two resonance modes of different symmetry classes and different frequencies in 2D resonant microcavity lasers is investigated by using a nonlinear dynamical model. The patterns of stationary lasing states and far fields are asymmetric in spite of the symmetric shape of the resonant microcavity. The corresponding phenomenon is actually observed in… (More)

Various kinds of devices, such as lasers and musical instruments, utilize stationary-wave oscillations in resonant cavities. In order to maintain stationary oscillation in these devices, nonlinearity is essential in the mechanism for balancing the pumping of the external energy and the decay of the wave of the quasistable state in the resonant cavity.… (More)

- Satoshi Sunada, Takahisa Harayama, Kensuke S. Ikeda
- Optics letters
- 2004

We study theoretically the effect of deformed microelliptical cavities on lasing characteristics. We show that the transition of stationary lasing states from unidirectional rotational waves to a mixture of clockwise and anticlockwise rotational waves occurs when the shape of a disk is deformed to that of an ellipse.

- Teruaki Okushima, Toshihiko Niiyama, Kensuke S. Ikeda, Yukiko Shimizu
- Physical review. E, Statistical, nonlinear, and…
- 2009

The aim of this paper is twofold: one is to give a detailed description of an alternative graph-based analysis method, which we call saddle connectivity graph, for analyzing the global topography and the dynamical properties of many-dimensional potential-energy landscapes and the other is to give examples of applications of this method in the analysis of… (More)

- Takahisa Harayama, Peter Davis, Kensuke S. Ikeda
- Physical review letters
- 2003

Laser action on a single spatially chaotic wave function is obtained as a final stable state in a nonlinear dynamical model of a stadium shaped resonant cavity with an active medium. The stable single-mode lasing state corresponds to a particular metastable resonance of the cavity which wins a competition among multiple modes with positive net linear gain… (More)

- Yasutaka Hanada, Akira Shudo, Kensuke S. Ikeda
- Physical review. E, Statistical, nonlinear, and…
- 2015

The enhancement of tunneling probability in the nearly integrable system is closely examined, focusing on tunneling splittings plotted as a function of the inverse of the Planck's constant. On the basis of the analysis using the absorber which efficiently suppresses the coupling, creating spikes in the plot, we found that the splitting curve should be… (More)

- Tomoaki Niiyama, Yasushi Shimizu, Taizo Kobayashi, Teruaki Okushima, Kensuke S. Ikeda
- Physical review letters
- 2007

Overall homogeneity of temperature is a condition for thermal equilibrium, but, as is demonstrated by classical molecular dynamics simulations, the local temperatures of atoms in small, isolated crystalline clusters in microcanonical equilibrium are not uniform. The effective temperature determined from individual atomic velocity decreases with distance… (More)

- Tomoaki Niiyama, Yasushi Shimizu, Taizo Kobayashi, Teruaki Okushima, Kensuke S. Ikeda
- Physical review. E, Statistical, nonlinear, and…
- 2009

We investigate numerically and analytically the effects of conservation of total translational and angular momentum on the distribution of kinetic energy among particles in microcanonical particle systems with small number of degrees of freedom, specifically microclusters. Molecular dynamics simulations of microclusters with constant total energy and… (More)

- Satoshi Sunada, Takahisa Harayama, Kensuke S. Ikeda
- Physical review. E, Statistical, nonlinear, and…
- 2005

Multimode lasing in a fully chaotic cavity is investigated numerically by using a nonlinear dynamics model. We report a transition process from single-mode lasing to multimode lasing and reveal interactions among the lasing modes. In particular, both mode-pulling and mode-pushing interactions are shown to decrease the number of effective lasing modes. In… (More)

- Tomoichiro Onishi, Akira Shudo, Kensuke S. Ikeda, Kentaro Takahashi
- Physical review. E, Statistical, nonlinear, and…
- 2001

We have revealed that the barrier-tunneling process in nonintegrable systems is strongly linked to chaos in complex phase space by investigating a simple scattering map model. The semiclassical wave function reproduces complicated features of tunneling perfectly and it enables us to solve all the reasons why those features appear in spite of absence of… (More)