We study the effects of spatial coupling in the noise properties of microchip lasers. We demonstrate that the synchronization phenomena commonly observed in spatially coupled unstable laser applies to the quantum-noise-driven dynamics in steady-state stable laser; this allows us to predict a new method of the generation of twin laser beams. We derive simple analytical expressions for the synchronization-induced noise reduction phenomena. We observe a compete suppression of the dominant relaxation oscillations peaks in the intensity difference noise spectrum, as well as photon statistics approaching the standard quantum limit.
Semiconductor lasers with optical feedback are prone to exhibit unstable behavior. When working near threshold with moderate to low optical feedback, intensity dropouts are observed. These intensity drops, also called low-frequency fluctuations, occur both in single-mode and multimode semiconductor lasers. In this paper, the dynamics of the power distribution between the longitudinal modes of a multimode semiconductor laser is experimentally and numerically analyzed in the low-frequency fluctuation regime. It is observed that power dropouts of the total intensity, corresponding to drops in the dominant modes of the laser, are invariably accompanied by sudden activations of several longitudinal side modes. These activations are seen not to be simultaneous to the dropouts of the main modes, but to occur after them. The phenomenon is statistically analyzed in a systematic way, and the corresponding delay is estimated, leading to the conclusion that the side mode activation is a consequence of the dropouts of the dominant modes. A multimode extension of the Lang-Kobayashi equations is used to model the experimental setup. Numerical simulations also exhibit a time delay between the side-mode activation and the power dropout of the total intensity.
We have carried out a series of numerical experiments on the dynamic behavior of J=0 yields J=1 yields J=0 lasers optically pumped by a linearly polarized laser field and operating either: (1) with a strongly anisotropic cavity yielding fixed linear laser field polarization at any angle (theta) with that of the pump beam, or (2) with an isotropic cavity and an axial magnetic field. In the first case (1) we show that by changing (theta) the steady-states experience a smooth monotonic variation, but the dynamic states undergo a complex sequence of bifurcations. In case (2) we find that the laser field is always linearly polarized, but for some parameter settings we report the first observation that the plane of polarization together with the laser intensity change chaotically.
We have carried out a series of numerical experiments on the dynamic behavior of optically pumped J equals 0 yields J equals 1 yields J equals 0 lasers operating with isotropic ring cavities and linearly polarized pump fields in the following conditions: (1) fixed linear polarization of the pump beam and applied axial magnetic field; (2) sinusoidal modulation of the pump polarization direction. Among rich dynamics, we report the first observation of polarization chaos in the laser output in both cases. In case (1) the laser polarization is linear but its orientation changes chaotically; in case (2) chaotic evolution of the ellipticity is also found.
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