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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

(* 5gSylts8  
Demo for program"RP Fiber Power": thulium-doped fiber laser, '0 ]r<O  
pumped at 790 nm. Across-relaxation process allows for efficient B1E$v(P3M  
population of theupper laser level. N*Yy&[  
*)            !(*  *)注释语句 4avc=Y5  
a>U6Ag<  
diagram shown: 1,2,3,4,5  !指定输出图表 @cZ\*,T  
; 1: "Powersvs. Position"     !分号是注释;光纤长度对功率的影响 q%>7L<r  
; 2:"Variation of the Pump Power"  !泵浦光功率变化对信号输出功率的影响 G%S6$@:  
; 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 C)OG62  
; 4:"Transverse Profiles"             !横向分布,横坐标为半径位置 'qjX$]H  
; 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 @@Q6TB  
3 -tO;GKb  
include"Units.inc"         !读取“Units.inc”文件中内容 %MN.O-Lc  
Rv,82iEKs  
include"Tm-silicate.inc"    !读取光谱数据 kQLT$8io  
zDB" r  
; Basic fiberparameters:    !定义基本光纤参数 (VyA6a8  
L_f := 4 { fiberlength }      !光纤长度 s _~IZ%+<.  
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 R"Kz!NTB  
r_co := 6 um { coreradius }                !纤芯半径 X'f)7RbT  
N_Tm := 100e24 { Tmdoping concentration }  !纤芯Tm离子掺杂浓度 _w z2  
_%{0?|=  
; Parameters of thechannels:                !定义光信道 'G8 ?'u_)  
l_p := 790 nm {pump wavelength }                !泵浦光波长790nm OqBC/p B  
dir_p := forward {pump direction (forward or backward) }   !前向泵浦 @T ysXx  
P_pump_in := 5 {input pump power }                    !输入泵浦功率5W je,c7ZFO  
w_p := 50 um {radius of pump cladding }               !包层泵浦相应的半径 50um ?W!ry7gXO  
I_p(r) := (r <=w_p) { pump intensity profile }          !泵浦光强度分布 +i.u< T  
loss_p := 0 {parasitic losses of pump wave }           !泵浦光寄生损耗为0 b,Ke>.m  
xdZ<| vMR  
l_s := 1940 nm {signal wavelength }                   !信号光波长1940nm oSY7IIf%L  
w_s := 7 um                          !信号光的半径 Wwhgo.Wx  
I_s(r) := exp(-2 *(r / w_s)^2)            !信号光的高斯强度分布 o&z!6"S<  
loss_s := 0                            !信号光寄生损耗为0 C',6%6P  
3rNc1\a;  
R_oc := 0.70 {output coupler reflectivity (right side) }      !输出耦合反射率 - IU4#s  
T#@{G,N  
; Function for defining themodel:   !定义模型函数,一定要有calc命令,否则函数只会被定义,但不会被执行 cvfUyp;P  
calc eLV.qLBUs  
  begin J=iRul^S  
    global allow all;                   !声明全局变量 8}BS2C%P  
    set_fiber(L_f, No_z_steps, '');        !光纤参数 #Ao !>qCE  
    add_ring(r_co, N_Tm); _{$fA6C  
    def_ionsystem();              !光谱数据函数 >F[GVmC  
    pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p);  !泵浦光信道 2Lfah?Tx~C  
    signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward);      !前向信号光信道 ?v4E<iXs  
    signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward);    !后向信号光信道 "Zcu[2,  
    set_R(signal_fw, 1, R_oc);                                 !设置反射率函数 &yU>2=/T  
    finish_fiber();                                   ARF\fF|<2  
  end; $7NCb7%/L  
Jf_%<\ O  
; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 ,q#2:b<E  
show "Outputpowers:"                                   !输出字符串Output powers: q@l(Qol  
show"pump:     ", P_out(pump):d3:"W"  !输出字符串pump:和计算值(格式为3个有效数字,单位W) <6jFKA<  
show"signal:   ",P_out(signal_fw):d3:"W" !输出字符串signal:和计算值(格式为3个有效数字,单位W) ` 1+%}}!$u  
u,o1{% O  
. I==-|  
; ------------- aGK@)&h$  
diagram 1:                   !输出图表1 ZzcPiTSO  
oa`#RC8N  
"Powers vs.Position"          !图表名称 6G of. :"f  
0%<+J;'o  
x: 0, L_f                      !命令x: 定义x坐标范围 G\=_e8(  
"position infiber (m)", @x      !x轴标签;@x 指示这些字符串沿坐标轴放置 | -+zofx  
y: 0, 15                      !命令y: 定义y坐标范围 GeV+/^u  
y2: 0, 100                    !命令y2: 定义第二个y坐标范围 eT[&L @l]b  
frame          !frame改变坐标系的设置 F*` t"7Lm  
legpos 600, 500  !图行在图表窗口中的位置(相对于左上角而言) W5SNI>|E  
hx             !平行于x方向网格 SK R1E];4  
hy              !平行于y方向网格 >c~RI7uu  
{@.Vh]  
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 y=Q!-~5|fF  
  color = red,  !图形颜色 x2W#ROfg  
  width = 3,   !width线条宽度 66\jV6eH7L  
  "pump"       !相应的文本字符串标签 V%NeZ1{ e  
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 EzpFOqJG  
  color = blue,     (=c1  
  width = 3, u9Y3?j,oC  
  "fw signal" q \O Ou  
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 `1+F,&e  
  color = blue, 9Ah[rK*}  
  style = fdashed, !{Z~<Ky  
  width = 3, ` A)"%~  
  "bw signal" Vn|1v4U!  
RMP9y$~3pU  
f: 100 * n(x, 2),    !n(x ,2) 函数是计算x位置处激活粒子数在能级2上的占比 2@khSWV  
  yscale = 2,            !第二个y轴的缩放比例 ke%pZ 7{u  
  color = magenta, ;Ii1B{W  
  width = 3, :O-1rD  
  style = fdashed, `u XQ z7  
  "n2 (%, right scale)" :a0zT#u  
_O]xey^r  
f: 100 * n(x, 3),          !n(x ,3) 函数是计算x位置处激活粒子数在能级3上的占比 M 2q"dz   
  yscale = 2, v }\,o%t^  
  color = red, L{&U V0q!  
  width = 3, 1^G{tlA-  
  style = fdashed, M.[rLJZ4  
  "n3 (%, right scale)" T!|=El>  
M;.ZM<Ga  
L'Q<>{;Ig  
; ------------- GTl xq%?b  
diagram 2:                    !输出图表2 1/Zh^foG  
@xAfZb2E  
"Variation ofthe Pump Power" e0HfP v_  
3tAU?sV!  
x: 0, 10 pA}S5x  
"pump inputpower (W)", @x <AoXEu D  
y: 0, 10 rcN 9.1  
y2: 0, 100 z(13~38+  
frame #,NvO!j<4  
hx bPbb\|u0d  
hy kcuzB+  
legpos 150, 150 =O$M_1lp  
q_[G1&MC  
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 xTz%nx  
  step = 5, PnYBy| yl  
  color = blue, v& $k9)]  
  width = 3, +^|iZbZKx  
  "signal output power (W, leftscale)",     !相应的文本字符串标签 }6u2*(TmD  
  finish set_P_in(pump, P_pump_in) bBc-^  
f!_ ctp  
f: (set_P_in(pump,x); 100 * n_av(2)),   !改变泵浦信号功率对能级2上激活粒子占比的影响 pY"O9x  
  yscale = 2, 3'`dFY,  
  step = 5, 9 ; i\g=  
  color = magenta, s>n(`?@L  
  width = 3, r' Z3  
  "population of level 2 (%, rightscale)", 3L5r*fa  
  finish set_P_in(pump, P_pump_in) e^1uVN  
u9qMqeF  
f: (set_P_in(pump,x); 100 * n_av(3)),   !改变泵浦信号功率对能级3上激活粒子占比的影响 eD?3"!c!  
  yscale = 2, 9ooY?J  
  step = 5, iEyeX0nm  
  color = red, KKe8 ly,  
  width = 3, <@v ]H@ E  
  "population of level 3 (%, rightscale)", )?! [}t  
  finish set_P_in(pump, P_pump_in) PJ4(}a  
i5}4(sV  
9LJZ-/Wq  
; ------------- \*t~==WB  
diagram 3:                         !输出图表3 ,M5}4E7L%s  
"/{RhY<  
"Variation ofthe Fiber Length"  XRN+`J  
~wm;;#_O  
x: 0.1, 5 ;E^K.6  
"fiber length(m)", @x 6A R2htN^  
y: 0, 10 B=f,QU  
"opticalpowers (W)", @y -e GL)M  
frame gY-5_Ab  
hx #]WqM1u  
hy 1Tp/MV/>  
da!P0x9p  
f: (set_L(x);P_out(signal_fw)),     !改变光纤长度对信号光输出功率的影响 Io`P,l:  
  step = 20,             _*M42<wcO  
  color = blue, CT a#Q,  
  width = 3, B5%n(,Lx  
  "signal output" jhgX{xc  
iSLGwTdLn  
;f: (set_L(x);P_out(pump)),                     !改变光纤长度对泵浦信号输出功率的影响 n{0Ld - zH  
   step = 20, color = red, width = 3,"residual pump" ZFm`UXS  
+avMX&%  
! set_L(L_f) {restore the original fiber length } :(|'S4z  
?tdd3ai>  
VZka}7a  
; ------------- ? 8aaD>OR$  
diagram 4:                                  !输出图表4 7R.Q Ql  
W<ZK,kv  
"TransverseProfiles" .0 )Y  
rHge~nY<  
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) /&#XhrT  
1+;C`bnA  
x: 0, 1.4 * r_co /um _Q%vK*n  
"radialposition (µm)", @x 8F(h*e_?  
y: 0, 1.2 * I_max *cm^2 }kHdK vZ  
"intensity (W/ cm&sup2;)", @y Jq.lT(E8D  
y2: 0, 1.3 * N_Tm \`<cH#  
frame <:>SGSE9  
hx j1q[2'  
hy 2aZw[7s  
Di_2Plo)4  
f: N_dop(1, x * um,0),      !掺杂浓度的径向分布 )4U> !KrY  
  yscale = 2, rPNb\Ri  
  color = gray, gJiK+&8I  
  width = 3, 8(g:HR*;  
  maxconnect = 1, 8b.u'r174  
  "N_dop (right scale)" kv,%(en]  
AE`We$!  
f: I(pump, -1, x *um, 0) * cm^2,    !泵浦光沿光纤径向的强度分布 yq-=],h  
  color = red, ,d+fDmm3  
  maxconnect = 1,           !限制图形区域高度,修正为100%的高度 0 S_':r   
  width = 3, 'TC/vnM  
  "pump" up3O|lj4  
'3]p29v{  
f: I(signal_fw, -1,x * um, 0) * cm^2,  !信号光沿光纤径向的强度分布 {CG_P,FO  
  color = blue, &c(WE RW?-  
  maxconnect = 1, 7'-Lp@an  
  width = 3, =p^He!  
  "signal" v[@c*wo  
"vYE+   
,t{,_uPJY  
; ------------- iqQUtE]E_  
diagram 5:                                  !输出图表5 aV o;~h~  
l.\re"Q  
"TransitionCross-sections" P7ph}mB  
P&d"V<  
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) Q-Ux<#  
[3l*F  
x: 1450, 2050 [ xOzzp4  
"wavelength(nm)", @x bPD`+: A_  
y: 0, 0.6 M/?KV9Xk2  
"cross-sections(1e-24 m&sup2;)", @y x^|Vaf  
frame I KtB;  
hx N"/-0(9[  
hy G2LK]  
&R|/t :DN  
f: s12_Tm(x * nm) /1e-24,      !Tm3+吸收截面与波长的关系 _rV5E  
  color = red, Qu5UVjbE,  
  width = 3, {e|*01hE  
  "absorption" G$'jEa<:u  
f: s21_Tm(x * nm) /1e-24,  !Tm3+发射截面与波长的关系 SvN9aD1  
  color = blue, 9!9Z~ /*m  
  width = 3,  ;N B:e  
  "emission" svelYe#9z  
}pk#!N  
lileisgsz 2021-09-28 09:47
感谢,视频上有点看不清楚
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