This reduces the problem to one dimension. However, that the coupling depends upon the mode width and other related parameters, and mode-conversion losses occur as to optical mode leavs cavity 1, diffracts in the air inside the gas, and then reenters cavity 2. In this paper we Interdev the concept of coupling constant and then obtain the longitudinal modes and their respective threshold gains for the coupled system.
Laser - Wikipedia
We consider the genral case applicable for both active-active and active-passive devices . Figure 2 shows the geometry and notion. The air gap itself froms a third FP cavity, and the intercavity coupling is affected by the loss and phase shift experienced by the optical field while traversing the gap. In the general case, reflectivity's rate the four facets may differ from each other More explicity, the gap is treated as a FP cavity on which the field E1 is incident from left Fig.
The simplest case occurs for a semiconductor laser coupled to an external mirror. In this case the coupling element is just the laser-air interface. Using these values in eqs. Using eqs. The loss and phase shift inside the gap are included through tg and Sij as given by eqs. The eigen value eq.
Before proceeding it is useful to interduce the concept of an effective-mirror reflectivity. In many cases the role of one cavity say cavity 2 is provide a control through which a signal FP mode of cavity 1 is selected. The effect of cavity 2 on mode selectivity can be treated by an effective reflectivity for the laser facet facing cavity 2. Although eq.
This is often the case for active-passive devices. In the case of active-active devices, the effective reflectivity concept is valid when cavity 2 is based below threshold. These losses rise mainly from diffraction-spreading of the beam inside the gap and have been estimated using a simple diffraction-spreading model perpendicular to the junction plane . Conclusion We are studied and analysed the effects of coupling constant, longitudinal modes, and threshold gain on coupled-cavity semiconductors which the coupling constant is depended on coupling phase, effective gap loss, and the air gap of width.
The other side the longitudinal modes and threshold are depended on the effective reflectivity and the lengths of cavities where this lengths and the effective reflectivity will limit the type of modes i. References 1. Coldren, K. Ebling, R. Swartz, and C.
Tsang; Academic Press , pp. Fiber Comm. Ebeling, L. Voumard, R. Salathe, and H. Streifer, D. Scifres, and R.
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