檢視 $cavitygainedge 的原始碼

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

 $cavitygainedge
 R1  R2  cavity-Length

After obtaining the intrinsic gain of laser diode structure. The program calculate the optical mode and also calculate the <br>
<math>\Gamma</math> in each ddcc layer. Ideally, the cavity can be calculated by 
 <math>g_{cav} = \sum \Gamma_{QW} \times gain</math>. 
Effective absorption loss can be calculated by
 <math> \alpha_{eff}= \Gamma_{i,loss layer} \times \alpha_{i} </math>. 
By the formula, can know that to obtain the gain
 <math>g_{cav}  > \alpha_{eff} - \frac{1}{2L}\times ln (R1\times R2) </math>.