E.A. Avrutin

Miscibility gap of ternary alloys of binary compounds with zinc-blende and wurtzite structures using the cluster variation method

The miscibility gap of the AxB1 − xC ternary alloys is described using the cluster variation method with a tetrahedron as the basic cluster. The maximum temperature of the boundary of miscibility gap is Tt = 0.835α/2R. It is shown that the miscibility gaps of AxB1 − xC ternary alloys with zinc-blende and wurtzite structures coincide in the approximation used.

Peculiarities of application of multimode semiconductor lasers for recording deep holograms

An analysis of the applicability of multimode laser diodes (LDs) in holography is presented. Coherence properties of the two most probable regimes of multimode operation, free- running and phase locked, are analyzed. Prospectives of the use of multimode LDs in recording deep holograms are estimated theoretically and experimentally.

Monolithically integrated optoelectronic down-converter (MIOD)

Optoelectronic down-conversion of very high-frequency amplitude-modulated signals using a semiconductor laser simultaneously as a local oscillator and a mixer is proposed. Three possible constructions of a monolithically integrated down-converter are considered theoretically: a four-terminal semiconductor laser with dual pumping current/modal gain control, and both a passively mode-locked and a passively Q-switched semiconductor laser monolithically integrated with an electroabsorption or pumping current modulator. Experimental verification of the feasibility of the concept of down conversion in a laser diode is presented.

Analysis of nonlinear optical-electromagnetic interactions in ultrafast mode-locked laser diodes

The operation of mode-locked (ML) semiconductor laser diodes (LDs), in common with lasers of other types, is a nonlinear process in which a balance of dispersion and various nonlinearities results in the generation of an ultrashort optical pulse, repeated at the cavity round-trip frequency or its harmonic and with parameters, averaged over a round-trip, constant, similar to an optical soliton. In this paper we theoretically analyse the fundamentals of high-frequency mode-locked laser diodes and their application to generating and/or frequency shifting ultrafast electrical signals.

Calculation of spinodal decomposition temperature in cubic ternary nitride materials including coherency stress and spontaneous ordering

We present a calculation of spinodal decomposition temperatures for a variety of nitride compounds taking into account both the coherency stress and an arbitrary degree of ordering and show that, for a given composition, superstructures tend to have lower decomposition temperatures than random alloys and may therefore be advantageous.

Analysis of Locked and Unlocked Dynamics of a Passively Mode Locked Laser Diode under External Periodic Excitation.

A distributed time-domain model is used for a numerical analysis of the dynamics of a passively mode locked laser diode under external modulation at a frequency close to the round-trip frequency of the laser. The possible dynamical regimes of the laser are identified as synchronization locking, frequency mixing and chaotic dynamics, including a special case of quasi-locking. For the locked regime, steady-state parameters are defined, the crucial role of group-velocity dispersion in achieving locking demonstrated and stages of the locking dynamics and corresponding time constants identified.

Multimode semiconductor lasers: the simplest light sources for holography?

Criteria for the applicability of multimode laser diodes (LDs) with total emission spectra as broad as 10-30 A in holography are considered. Coherence properties of the two most probable regimes of multimode operation, free-running and phase locked, are analyzed. Prospectives of the use of multimode LDs in recording deep holograms are estimated theoretically and experimentally.