Igor Koryukin

Influence of carrier diffusion on the dynamics of a two-mode laser

The two-mode semiconductor laser rate equations are generalized to account for the diffusion of free carriers. Using the diffusion coefficient as a control parameter we analyze the competition between small-scale and large-scale gratings in the laser dynamics. Many solutions become unstable as the diffusion coefficient decreases. >

Antiphase dynamics of selectively coupled multimode semiconductor lasers

We analyze the experiment of A. Uchida et al. (2001) reporting on the synchronization of multimode semiconductor lasers coupled unidirectionally through one of the transmitter modes. We show that only the coupled modes are synchronized and that the dynamical regimes of the two lasers are different, though leading to similar power spectra.

Disappearance of relaxation oscillation frequencies in a multimode solid-state laser

Abstract We study analytically the Tang, Statz and deMars rate equations describing a solid-state Fabry-Perot laser. When the modes have equal gains, there is a critical number of lasing modes, above which the low-frequency relaxation oscillations responsible for antiphase dynamics disappear. These results are generalized to include unequal modal gains resulting from a Lorentzian gain profile.

Two-mode threshold of a solid-state Fabry-Perot laser

We analyse the two longitudinal mode threshold of a solid-state Fabry–Perot laser with a spatially nonuniform pump for two configurations: an end-pumped laser and a laser with a partially filled cavity. The threshold is derived in a consistent way. We prove that inhomogeneous pumping or partial filling of the cavity hardly modify the two-mode threshold.

Multimode fabry-perot laser: Number of relaxation frequencies

We study analytically the Tang, Statz, and deMars equations describing a solid-state Fabry-Perot laser to determine how many relaxation oscillations it displays. When the modes have equal gains, the number of relaxation oscillations varies between zero and the mode number, depending on the laser parameters. In particular, a large number of modes or a relatively large pumping rate leads to the elimination of all relaxation oscillations except one, thereby simplifying the noise spectrum. These results are generalized to include unequal modal gains such as might result from the Lorentzian gain profile.

Gyroscopic potentialities of semiconductor ring laser

The theory of semiconductor ring laser is developed. It is found that both carrier diffusion and linewidth enhancement factor, which are specific for semiconductors, influence highly the laser behavior. In particular, the stable bidirectional lasing with comparable counterrunning wave intensities appears. The effect of cavity phase nonreciprocity (rotation) on the laser behavior is investigated. It is shown that information about phase nonreciprocity value is contained both in the relaxation oscillation spectra of unidirectional lasing and in the difference of counterrunning wave frequencies in bidirectional regime. This feature gives a possibility to use such laser as a compact gyroscope.

Instabilities and chaos in multimode lasers

It is shown that combination mode-mode couplings are responsible for spectral instability in a ring laser. The key role of nonequidistancy in combination mode-mode coupling efficiency is proven.