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- Takuya Mikami, Kazutaka Kanno, +7 authors Peter Davis
- Physical review. E, Statistical, nonlinear, and…
- 2012

We analyze the time for growth of bit entropy when generating nondeterministic bits using a chaotic semiconductor laser model. The mechanism for generating nondeterministic bits is modeled as a 1-bit sampling of the intensity of light output. Microscopic noise results in an ensemble of trajectories whose bit entropy increases with time. The time for the… (More)

The Sagnac effect is the phase difference between two counter-propagating laser beams in the same ring resonator due to rotation, originally introduced by Sagnac in 1913[1]. It has become the basis for the operation of the optical gyroscopes such as ring laser gyroscopes and fiber optic gyroscopes after the invention of lasers and optical fibers in 1970’s… (More)

- Kunihito Hirano, Taiki Yamazaki, +7 authors Peter Davis
- Optics express
- 2010

We experimentally demonstrate random bit generation using multi-bit samples of bandwidth-enhanced chaos in semiconductor lasers. Chaotic fluctuation of laser output is generated in a semiconductor laser with optical feedback and the chaotic output is injected into a second semiconductor laser to obtain a chaotic intensity signal with bandwidth enhanced up… (More)

- Takahisa Harayama, Satoshi Sunada, +4 authors Peter Davis
- Physical review. E, Statistical, nonlinear, and…
- 2012

We theoretically show that completely stochastic fast physical random bit generation at a rate of more than one gigabit per second can be realized by using lasers with optical delayed feedback which creates high-dimensional chaos of laser light outputs. The theory is based on the mixing property of chaos, which transduces microscopic quantum noise of… (More)

- 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)

- Hirofumi Makino, Takahisa Harayama, Yoshifusa Aizawa
- Physical review. E, Statistical, nonlinear, and…
- 2001

The quantum level statistics affected by bifurcations in classical dynamics is studied by using a one-parameter family of lemon billiard systems. The classical phase space of our system consists of regular and irregular regions. We determine an analytic solution of the phase volume for these regions as a function of the system parameter and show that the… (More)

- Susumu Shinohara, Takahisa Harayama, Takehiro Fukushima, Martina Hentschel, Takahiko Sasaki, E. E. Narimanov
- Physical review letters
- 2010

We study the effect of dynamical tunneling on emission from ray-chaotic microcavities by introducing a suitably designed deformed disk cavity. We focus on its high quality factor modes strongly localized along a stable periodic ray orbit confined by total internal reflection. It is shown that dominant emission originates from the tunneling from the periodic… (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)

- Tomoko Tanaka, Martina Hentschel, Takehiro Fukushima, Takahisa Harayama
- Physical review letters
- 2007

We study the far-field characteristics of oval-resonator laser diodes made of an GaAs/Al(x)Ga(1-x)As quantum well. The resonator shapes are various oval geometries, thereby probing chaotic and mixed classical dynamics. The far-field pattern shows a pronounced fine structure that strongly depends on the cavity shape. Comparing the experimental data with… (More)

- Takahisa Harayama, Tekehiro Fukushima, +4 authors T. Aida
- Physical review. E, Statistical, nonlinear, and…
- 2003

Scar wave functions in a fully chaotic cavity are obtained numerically by an extended Fox-Li method. Lasing on the scar modes are observed in a semiconductor microcavity with a selective excitation of different scars controlled by corresponding shape of electrodes for current injection.