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小火龙果

2020-05-28 16:28

RP Fiber Power仿真设计掺铥光纤激光器代码详解

(*
Demo for program"RP Fiber Power": thulium-doped fiber laser,
pumped at 790 nm. Across-relaxation process allows for efficient
population of theupper laser level.
*)            ！（*  *）注释语句

diagram shown: 1,2,3,4,5  ！指定输出图表
; 1: "Powersvs. Position"     ！分号是注释；光纤长度对功率的影响
; 2:"Variation of the Pump Power"  ！泵浦光功率变化对信号输出功率的影响
; 3:"Variation of the Fiber Length"！信号输出功率vs 光纤长度的变化，仿真最佳光纤长度
; 4:"Transverse Profiles"             ！横向分布，横坐标为半径位置
; 5:"Transition Cross-sections"    ！不同波长的跃迁横截面，横坐标波长，纵坐标为横截面

include"Units.inc"         ！读取“Units.inc”文件中内容

include"Tm-silicate.inc"    ！读取光谱数据

; Basic fiberparameters:    ！定义基本光纤参数
L_f := 4 { fiberlength }      ！光纤长度
No_z_steps := 50 {no steps along the fiber } ！光纤步长，大括号{ }是注释，相当于备注
r_co := 6 um { coreradius }                ！纤芯半径
N_Tm := 100e24 { Tmdoping concentration }  ！纤芯Tm离子掺杂浓度

; Parameters of thechannels:                ！定义光信道
l_p := 790 nm {pump wavelength }                ！泵浦光波长790nm
dir_p := forward {pump direction (forward or backward) }   ！前向泵浦
P_pump_in := 5 {input pump power }                    ！输入泵浦功率5W
w_p := 50 um {radius of pump cladding }               ！包层泵浦相应的半径 50um
I_p(r) := (r <=w_p) { pump intensity profile }          ！泵浦光强度分布
loss_p := 0 {parasitic losses of pump wave }           ！泵浦光寄生损耗为0

l_s := 1940 nm {signal wavelength }                   ！信号光波长1940nm
w_s := 7 um                          ！信号光的半径
I_s(r) := exp(-2 *(r / w_s)^2)            ！信号光的高斯强度分布
loss_s := 0                            ！信号光寄生损耗为0

R_oc := 0.70 {output coupler reflectivity (right side) }      ！输出耦合反射率

; Function for defining themodel:   ！定义模型函数，一定要有calc命令，否则函数只会被定义，但不会被执行
calc
  begin
    global allow all;                   ！声明全局变量
    set_fiber(L_f, No_z_steps, '');        ！光纤参数
    add_ring(r_co, N_Tm);
    def_ionsystem();              ！光谱数据函数
    pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p);  ！泵浦光信道
    signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward);      ！前向信号光信道
    signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward);    ！后向信号光信道
    set_R(signal_fw, 1, R_oc);                                 ！设置反射率函数
    finish_fiber();
  end;

; Display someoutputs in the Output window (on the right side): ！在Output aera区域显示输出
show "Outputpowers:"                                   ！输出字符串Output powers：
show"pump:     ", P_out(pump):d3:"W"  ！输出字符串pump：和计算值（格式为3个有效数字，单位W）
show"signal:   ",P_out(signal_fw):d3:"W" ！输出字符串signal：和计算值（格式为3个有效数字，单位W）

; -------------
diagram 1:                   !输出图表1

"Powers vs.Position"          ！图表名称

x: 0, L_f                      ！命令x: 定义x坐标范围
"position infiber (m)", @x      ！x轴标签；@x 指示这些字符串沿坐标轴放置
y: 0, 15                      ！命令y: 定义y坐标范围
y2: 0, 100                    ！命令y2: 定义第二个y坐标范围
frame          ！frame改变坐标系的设置
legpos 600, 500  ！图行在图表窗口中的位置（相对于左上角而言）
hx             ！平行于x方向网格
hy              ！平行于y方向网格

f: P(pump, x),    ！命令f: 定义函数图；P(pump, x)函数是计算x位置处的泵浦光功率
  color = red,  ！图形颜色
  width = 3,   ！width线条宽度
  "pump"       ！相应的文本字符串标签
f: P(signal_fw, x),  ！P(signal_fw ,x) 函数是计算x位置处的前向信号光功率
  color = blue,
  width = 3,
  "fw signal"
f: P(signal_bw, x),   ！P(signal_bw ,x) 函数是计算x位置处的后向信号光功率
  color = blue,
  style = fdashed,
  width = 3,
  "bw signal"

f: 100 * n(x, 2),    ！n(x ,2) 函数是计算x位置处激活粒子数在能级2上的占比
  yscale = 2,            ！第二个y轴的缩放比例
  color = magenta,
  width = 3,
  style = fdashed,
  "n2 (%, right scale)"

f: 100 * n(x, 3),          ！n(x ,3) 函数是计算x位置处激活粒子数在能级3上的占比
  yscale = 2,
  color = red,
  width = 3,
  style = fdashed,
  "n3 (%, right scale)"

; -------------
diagram 2:                    ！输出图表2

"Variation ofthe Pump Power"

x: 0, 10
"pump inputpower (W)", @x
y: 0, 10
y2: 0, 100
frame
hx
hy
legpos 150, 150

f: (set_P_in(pump, x);P_out(signal_fw)), ！set_P_in(pump,x)改变泵浦信道功率；P_out(signal_fw)输出前向信号光
  step = 5,
  color = blue,
  width = 3,
  "signal output power (W, leftscale)",     ！相应的文本字符串标签
  finish set_P_in(pump, P_pump_in)

f: (set_P_in(pump,x); 100 * n_av(2)),   ！改变泵浦信号功率对能级2上激活粒子占比的影响
  yscale = 2,
  step = 5,
  color = magenta,
  width = 3,
  "population of level 2 (%, rightscale)",
  finish set_P_in(pump, P_pump_in)

f: (set_P_in(pump,x); 100 * n_av(3)),   ！改变泵浦信号功率对能级3上激活粒子占比的影响
  yscale = 2,
  step = 5,
  color = red,
  width = 3,
  "population of level 3 (%, rightscale)",
  finish set_P_in(pump, P_pump_in)

; -------------
diagram 3:                         ！输出图表3

"Variation ofthe Fiber Length"

x: 0.1, 5
"fiber length(m)", @x
y: 0, 10
"opticalpowers (W)", @y
frame
hx
hy

f: (set_L(x);P_out(signal_fw)),     ！改变光纤长度对信号光输出功率的影响
  step = 20,
  color = blue,
  width = 3,
  "signal output"

;f: (set_L(x);P_out(pump)),                     ！改变光纤长度对泵浦信号输出功率的影响
   step = 20, color = red, width = 3,"residual pump"

! set_L(L_f) {restore the original fiber length }

; -------------
diagram 4:                                  ！输出图表4

"TransverseProfiles"

I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0))

x: 0, 1.4 * r_co /um
"radialposition (µm)", @x
y: 0, 1.2 * I_max *cm^2
"intensity (W/ cm²)", @y
y2: 0, 1.3 * N_Tm
frame
hx
hy

f: N_dop(1, x * um,0),      ！掺杂浓度的径向分布
  yscale = 2,
  color = gray,
  width = 3,
  maxconnect = 1,
  "N_dop (right scale)"

f: I(pump, -1, x *um, 0) * cm^2,    ！泵浦光沿光纤径向的强度分布
  color = red,
  maxconnect = 1,           ！限制图形区域高度，修正为100%的高度
  width = 3,
  "pump"

f: I(signal_fw, -1,x * um, 0) * cm^2,  ！信号光沿光纤径向的强度分布
  color = blue,
  maxconnect = 1,
  width = 3,
  "signal"

; -------------
diagram 5:                                  ！输出图表5

"TransitionCross-sections"

I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0))

x: 1450, 2050
"wavelength(nm)", @x
y: 0, 0.6
"cross-sections(1e-24 m²)", @y
frame
hx
hy

f: s12_Tm(x * nm) /1e-24,      ！Tm³⁺吸收截面与波长的关系
  color = red,
  width = 3,
  "absorption"
f: s21_Tm(x * nm) /1e-24,  ！Tm³⁺发射截面与波长的关系
  color = blue,
  width = 3,
  "emission"

lileisgsz	2021-09-28 09:47
感谢，视频上有点看不清楚

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