$activateStimEL

$activateStimEL is a command used to enable the calculation of stimulate Emission.

The stimulate emission coefficient is calculated by:

$B_{stim} = B_{0} \times \beta \times \frac{R_{rad}}{R_{th}-R_{rad}}$
$R_{stim} = B_{stim} \times n \times p$
$B_{0}:$ is the radiative recombination coefficient
$R_{th}:$ is the threshold recombination rate
$R_{rad}:$ is the spontaneous radiative recombination rates decided by  $B_{0}\times n \times p$
$\beta:$ is the fitting coefficient. 

The way to activate the command is as following

$activateStimEL
Method QW_number 1st_QW_layerNum 2nd_QW_layerNum 3rd_QW_layerNum ...
$\beta_{1}~~  R_{th,1}  ~~ P3_1~~ P4_1$
$\beta_{2}~~  R_{th,2}  ~~ P3_2~~ P4_2$
$\beta_{3}~~  R_{th,3}  ~~ P3_3~~ P4_3$
$\beta_{4}~~  R_{th,4}  ~~ P3_4~~ P4_4$
$\beta_{5}~~  R_{th,5}  ~~ P3_5~~ P4_5$
.....
..... total N layers (regions)
$\beta_{N}~~  R_{th,N}  ~~ P3_N~~ P4_N$

Method: 1 -> Given $\beta$ and $R_{th}$ of each layer. If this is layer is not QW, set $\beta=0.0~~,and~~R_{th}=0.0$
Method: 2 -> defined for future expansion
$P3$, $P4$ : Not used. It might be used when Method 2 is activate in the future

For example:

$activateStimEL
1 1 2 
0.000 5.0e27 0.00 0.00
1.000e-4 5.0e27 0.00 0.00
0.000 5.0e27 0.00 0.00
0.000 5.0e27 0.00 0.00

In this command, use method 1. There is 1 QW which is the 2nd layer. The $\beta$ and $R_{th}$ of the 2nd layer is 1.0e-4 and 5.0e27 $(1/cm^{3}s)$

The $activateStimEL setting in GUI interface is here
1. After setting up the general structure, press Additional Function.
2. Check the box for Stimulate emission setting and fill in these fields as needed!