[原创]RP Fiber Power仿真设计掺铥光纤激光器代码详解 [复制链接]

(* G `B=:s]  
Demo for program"RP Fiber Power": thulium-doped fiber laser, yS[HYq  
pumped at 790 nm. Across-relaxation process allows for efficient _\= /~>Xl  
population of theupper laser level. 8DbP$Wwi  
*)            ！（*  *）注释语句 +qqCk  
:S!!J*0  
diagram shown: 1,2,3,4,5  ！指定输出图表 `0w!&  
; 1: "Powersvs. Position"     ！分号是注释；光纤长度对功率的影响 z(2G"}  
; 2:"Variation of the Pump Power"  ！泵浦光功率变化对信号输出功率的影响 ,OP\^  
; 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 N=~DSsw  
; 4:"Transverse Profiles"             ！横向分布，横坐标为半径位置 d>c`hQ(V  
; 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 i }Zz[b  

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C  
include"Units.inc"         ！读取“Units.inc”文件中内容 =}u?1~V  
A{T>Aac  
include"Tm-silicate.inc"    ！读取光谱数据 0;*[}M]Z  
Ox)_7A  
; Basic fiberparameters:    ！定义基本光纤参数 %.Kr`#lCr  
L_f := 4 { fiberlength }      ！光纤长度 lL5*l,)To  
No_z_steps := 50 {no steps along the fiber } ！光纤步长，大括号{ }是注释，相当于备注 qzLD  
r_co := 6 um { coreradius }                ！纤芯半径 s$0dLEa9  
N_Tm := 100e24 { Tmdoping concentration }  ！纤芯Tm离子掺杂浓度 9;`hJ!r  
7uF @Xh  
; Parameters of thechannels:                ！定义光信道 -~H "zu`  
l_p := 790 nm {pump wavelength }                ！泵浦光波长790nm / T_v8{D  
dir_p := forward {pump direction (forward or backward) }   ！前向泵浦 9y} J|z  
P_pump_in := 5 {input pump power }                    ！输入泵浦功率5W BGOS(  
w_p := 50 um {radius of pump cladding }               ！包层泵浦相应的半径 50um 1]A\@(  
I_p(r) := (r <=w_p) { pump intensity profile }          ！泵浦光强度分布 Zw%:mZN   
loss_p := 0 {parasitic losses of pump wave }           ！泵浦光寄生损耗为0 =*>.z@WQ  
%zDi|WZ  
l_s := 1940 nm {signal wavelength }                   ！信号光波长1940nm fjuPGg~  
w_s := 7 um                          ！信号光的半径 vkM_a}%<  
I_s(r) := exp(-2 *(r / w_s)^2)            ！信号光的高斯强度分布 6{g&9~V  
loss_s := 0                            ！信号光寄生损耗为0 wsc=6/#u  
U^DR'X=  
R_oc := 0.70 {output coupler reflectivity (right side) }      ！输出耦合反射率 i1]}Q$  
Z[,
,(M  
; 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 AXnKhYlu  
calc %rEP.T\i
 
  begin /c4$m3?]  
    global allow all;                   ！声明全局变量 Ywcgt|  
    set_fiber(L_f, No_z_steps, '');        ！光纤参数 Z*v`kl  
    add_ring(r_co, N_Tm); |V
u`-L'Jz  
    def_ionsystem();              ！光谱数据函数 iuM ,aF  
    pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p);  ！泵浦光信道 pE0@m-p  
    signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward);      ！前向信号光信道 Imyw-8/;  
    signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward);    ！后向信号光信道 (hRg0Z=  
    set_R(signal_fw, 1, R_oc);                                 ！设置反射率函数 %j{*`}
 
    finish_fiber();                                   *<?KOM  
  end; ST4[
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R+/kx#^  
; Display someoutputs in the Output window (on the right side): ！在Output aera区域显示输出 [<Mls@?  
show "Outputpowers:"                                   ！输出字符串Output powers： ~4] J'E >  
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） _=cuOo"!  
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） qS ggZ0*  
zY-?Bv_D  
9OlJC[  
; ------------- 0j}@lOt(  
diagram 1:                   !输出图表1 ,XN4Iy#BZl  
{7 ](-  
"Powers vs.Position"          ！图表名称 58`Dcx,yJ  
$H/: -v  
x: 0, L_f                      ！命令x: 定义x坐标范围 P$@:T[}v  
"position infiber (m)", @x      ！x轴标签；@x 指示这些字符串沿坐标轴放置 ^$rqyWZYp  
y: 0, 15                      ！命令y: 定义y坐标范围 :SZi4:4-J8  
y2: 0, 100                    ！命令y2: 定义第二个y坐标范围 "1p, r&}  
frame          ！frame改变坐标系的设置 OL@
$RTh  
legpos 600, 500  ！图行在图表窗口中的位置（相对于左上角而言） 9tmnx')_  
hx             ！平行于x方向网格 c s:E^  
hy              ！平行于y方向网格 3b`#)y^y?%  
"=$uv  
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 bJeF1LjS  
  color = red,  ！图形颜色 >yLdrf  
  width = 3,   ！width线条宽度 ;D%H}+Z  
  "pump"       ！相应的文本字符串标签 3S%/>)k  
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 SR<W3a\  
  color = blue,     i|S/g.r  
  width = 3, F9r|EU#;  
  "fw signal" uw@-.N^  
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 tQTjqy{K  
  color = blue, ':f,RG  
  style = fdashed, H5CL0#I  
  width = 3, iWkC:fQz  
  "bw signal" oTTE<Ct[  
Ac}5,  
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 ~Ds3-#mMy  
  yscale = 2,            ！第二个y轴的缩放比例 dkQP.Tj$i  
  color = magenta, `@So6%3Y|  
  width = 3, ]v+yeGIKS  
  style = fdashed, /38XaKc{6  
  "n2 (%, right scale)" QQ %W3D@  
Yq{R*HO  
f: 100 * n(x, 3),          ！n(x ,3) 函数是计算x位置处激活粒子数在能级3上的占比 }z2[w@M  
  yscale = 2, Q4g69
IE  
  color = red, FB3}M)G>M  
  width = 3, MaF4lFmS  
  style = fdashed, E[FE-{B#  
  "n3 (%, right scale)" 1`~.!yd8(  
L3s"L.G  
hK %FpGYA  
; ------------- ;RMevVw|  
diagram 2:                    ！输出图表2 m.lzkS]P  
NuX
II-  
"Variation ofthe Pump Power" o76{;Bl\O  
:xY9eq=  
x: 0, 10 ghTue*A  
"pump inputpower (W)", @x Fnd_\`9{  
y: 0, 10 f`[E^zj  
y2: 0, 100 F><ficT  
frame ezS@`_pR;  
hx 9vCCE[9  
hy w/9%C(w6  
legpos 150, 150 HI[Pf%${  
.kB!',v\  
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 h&rZR
`g  
  step = 5, 'k[vcnSz\/  
  color = blue, 7}pg7EF3z  
  width = 3, x]IJ;  
  "signal output power (W, leftscale)",     ！相应的文本字符串标签 s|k&@
jH)  
  finish set_P_in(pump, P_pump_in) zu 7Fq]zD  
AP ]`'C  
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 1I40N[PE)  
  yscale = 2, U&
#`5u6'j  
  step = 5, bas1(/|S  
  color = magenta, Zb:Z,O(vn  
  width = 3, ryb81.|  
  "population of level 2 (%, rightscale)", |<MSV KW  
  finish set_P_in(pump, P_pump_in) /.>%IcK  
dfh 1^G
o  
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 ,}NTV~  
  yscale = 2, bL5u;iy)  
  step = 5, Q(x/&]7=V  
  color = red, '1~;^rU  
  width = 3, F 1l8jB\  
  "population of level 3 (%, rightscale)", s@6Jz\<E  
  finish set_P_in(pump, P_pump_in) @gw8r[  
E;An':j  
M(n@ytz  
; ------------- L-%'jR  
diagram 3:                         ！输出图表3 5kojh _\  
8Y:x+v5  
"Variation ofthe Fiber Length" *U`R<mV\  
3PlIn0+LX  
x: 0.1, 5 7}`FXB  
"fiber length(m)", @x yet~  
y: 0, 10 \9`.jB~<  
"opticalpowers (W)", @y $)d34JM  
frame #aiI]'  
hx l hST%3Ld  
hy .hnq>R\  
45OAJ?N  
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 ? 51i0~O=  
  step = 20,             6h0}ZM  
  color = blue, R`B} T<*
  
  width = 3, <kWkc|zBY  
  "signal output" 8s %YudW  
vin3 i&k  
;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 unKgOvtj  
   step = 20, color = red, width = 3,"residual pump" e0j4t-lL  
dnh~An 9  
! set_L(L_f) {restore the original fiber length } 9SJSUv:@  
}_('3C,Ba  
{qOqtkj  
; ------------- }(,{^".[}  
diagram 4:                                  ！输出图表4 Z*-a=u%gl'  
9'@G7*Yn  
"TransverseProfiles" {WQ6=wGpS  
HJP~ lg  
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) S#<y_w%  
k|{ 4"4r  
x: 0, 1.4 * r_co /um "oyBF CW  
"radialposition (µm)", @x cDK)zD  
y: 0, 1.2 * I_max *cm^2 #Tt*NU  
"intensity (W/ cm&sup2;)", @y 4Z5;y[k(  
y2: 0, 1.3 * N_Tm %F^,6y  
frame mkrVeBp  
hx lD-2 5~YV  
hy .Lu3LVS  
s+z5"3'n  
f: N_dop(1, x * um,0),      ！掺杂浓度的径向分布 \A)Pcc}7  
  yscale = 2, oB~V~c}8x  
  color = gray, Et0)6^-v  
  width = 3, n{&;@mgI  
  maxconnect = 1, `r-3"or/$  
  "N_dop (right scale)" `zB bB^\`W  
GLX{EG9Z  
f: I(pump, -1, x *um, 0) * cm^2,    ！泵浦光沿光纤径向的强度分布 IAmZ_2  
  color = red, E0yx @Vx  
  maxconnect = 1,           ！限制图形区域高度，修正为100%的高度 CGkx_E]  
  width = 3, /Z,hQ>/  
  "pump" S_ UAz  
\Hf/8!q  
f: I(signal_fw, -1,x * um, 0) * cm^2,  ！信号光沿光纤径向的强度分布 Bf6i{`!G  
  color = blue, ;tF&r1  
  maxconnect = 1, Nwe-7/Q  
  width = 3, ZKq#PB/.  
  "signal" M'F<1(  
&]shBvzl^  
mx UyD[|  
; ------------- adAdX;@e`  
diagram 5:                                  ！输出图表5 zqBzataR:  
/J&ks>St  
"TransitionCross-sections" `
j!_tE`  
hQlyqTP|2  
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) E!BzE_|i  
uG +ZR: _  
x: 1450, 2050 &flRrJ  
"wavelength(nm)", @x </1]eDnU  
y: 0, 0.6 E|+<m!  
"cross-sections(1e-24 m&sup2;)", @y {cb<9Fii  
frame Jb^{o+s53  
hx ^!0z+M:>^  
hy M ?AX:0  
/oLY\>pD  
f: s12_Tm(x * nm) /1e-24,      ！Tm<sup>3+</sup>吸收截面与波长的关系 Nu\<Xr8  
  color = red, }`%ks  
  width = 3, C'R6mz%Q?  
  "absorption" 1uCF9P ai  
f: s21_Tm(x * nm) /1e-24,  ！Tm³⁺发射截面与波长的关系 3HW&\:q5'M  
  color = blue, ts}OE  
  width = 3, 3vjOfr`  
  "emission" Q\T?t
 
DvB{N`COd  

感谢，视频上有点看不清楚