$cavitygainedge

$cavitygainedge command is used to help to calculate the cavity gain in the end of gain calculation.
The input format is

$cavitygainedge
R1  R2  cavity-Length

After obtaining the intrinsic gain of laser diode structure. The program calculate the optical mode and also calculate the
$\mathrm{\Gamma }$ in each ddcc layer. Ideally, the cavity can be calculated by

$g_{cav}=\sum {\mathrm{\Gamma }}_{QW}\times gain$. 

Effective absorption loss can be calculated by

${\alpha }_{eff}={\mathrm{\Gamma }}_{i,losslayer}\times {\alpha }_i$. 

By the formula, can know that to obtain the gain

$g_{cav}>{\alpha }_{eff}-\frac{1}{2L}\times ln(R1\times R2)$.

The $cavitygainedge setting for 1D-DDCC in GUI interface

The parameters are modified in Step 3.