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

(* 4PC'7V=S  
Demo for program"RP Fiber Power": thulium-doped fiber laser, r<]^.]3zj  
pumped at 790 nm. Across-relaxation process allows for efficient ,>g(%
3C  
population of theupper laser level. mj9|q8v{+  
*)            ！（*  *）注释语句
M|y!,/'  
d*!H&1L  
diagram shown: 1,2,3,4,5  ！指定输出图表 XW'7  
; 1: "Powersvs. Position"     ！分号是注释；光纤长度对功率的影响 E.'6p \  
; 2:"Variation of the Pump Power"  ！泵浦光功率变化对信号输出功率的影响 57 Vn-  
; 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 3b?-83a  
; 4:"Transverse Profiles"             ！横向分布，横坐标为半径位置 ^=I[uX-3ue  
; 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 q89yW)XG  
<qMX,h2  
include"Units.inc"         ！读取“Units.inc”文件中内容 {3Gj rE  
)`=N+k]  
include"Tm-silicate.inc"    ！读取光谱数据 C _W]3  
P^
-x  
; Basic fiberparameters:    ！定义基本光纤参数 VQ~eg wJL  
L_f := 4 { fiberlength }      ！光纤长度 (^=kV?<  
No_z_steps := 50 {no steps along the fiber } ！光纤步长，大括号{ }是注释，相当于备注 uxrNkZia  
r_co := 6 um { coreradius }                ！纤芯半径 s5b<KQ.  
N_Tm := 100e24 { Tmdoping concentration }  ！纤芯Tm离子掺杂浓度 p<VW;1bt5  
<!u(_Bxw/  
; Parameters of thechannels:                ！定义光信道 G*v,-O  
l_p := 790 nm {pump wavelength }                ！泵浦光波长790nm 4!glgE
E*  
dir_p := forward {pump direction (forward or backward) }   ！前向泵浦 .GnoK?  
P_pump_in := 5 {input pump power }                    ！输入泵浦功率5W ]~WIGl"g  
w_p := 50 um {radius of pump cladding }               ！包层泵浦相应的半径 50um 6yaWxpW  
I_p(r) := (r <=w_p) { pump intensity profile }          ！泵浦光强度分布 c1]\.s  
loss_p := 0 {parasitic losses of pump wave }           ！泵浦光寄生损耗为0 3e[k9`  
g2lv4Tiq-  
l_s := 1940 nm {signal wavelength }                   ！信号光波长1940nm RvW>kATb_F  
w_s := 7 um                          ！信号光的半径 .bMU$O1  
I_s(r) := exp(-2 *(r / w_s)^2)            ！信号光的高斯强度分布 +w?1<Z  
loss_s := 0                            ！信号光寄生损耗为0 7 dG_E]&  
5OFb9YX  
R_oc := 0.70 {output coupler reflectivity (right side) }      ！输出耦合反射率  `Q^Vm3h  
@XF/hhGE_y  
; Function for defining themodel:   ！定义模型函数，一定要有calc命令，否则函数只会被定义，但不会被执行 =66,$~g{  
calc @iz6)2z  
  begin {*|$@%y!  
    global allow all;                   ！声明全局变量 atFu KYI  
    set_fiber(L_f, No_z_steps, '');        ！光纤参数 (i'wa6[E8  
    add_ring(r_co, N_Tm); TwE&5F*  
    def_ionsystem();              ！光谱数据函数 qr/N?,  
    pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p);  ！泵浦光信道 B415{  
    signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward);      ！前向信号光信道 1n ZE9;o  
    signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward);    ！后向信号光信道 ffQ&1T<  
    set_R(signal_fw, 1, R_oc);                                 ！设置反射率函数 m+'X8}GC#O  
    finish_fiber();                                   9;c]_zt  
  end; j%&^qD,  
XN'X&J  
; Display someoutputs in the Output window (on the right side): ！在Output aera区域显示输出 |z%*}DPrpa  
show "Outputpowers:"                                   ！输出字符串Output powers： X/wqfP  
show"pump:     ", P_out(pump):d3:"W"  ！输出字符串pump：和计算值（格式为3个有效数字，单位W） j@s,5:;[  
show"signal:   ",P_out(signal_fw):d3:"W" ！输出字符串signal：和计算值（格式为3个有效数字，单位W） T\HP5&  
=HvLuVc  
_bq2h%G=8  
; ------------- hta$k%2  
diagram 1:                   !输出图表1 7<ES&ls_  
].w$b)G  
"Powers vs.Position"          ！图表名称 Ib4 8`  
T1b9Zqc)f  
x: 0, L_f                      ！命令x: 定义x坐标范围 -1u N Z{0  
"position infiber (m)", @x      ！x轴标签；@x 指示这些字符串沿坐标轴放置 \E<)B#  
y: 0, 15                      ！命令y: 定义y坐标范围 w4+bzdZ  
y2: 0, 100                    ！命令y2: 定义第二个y坐标范围 whg?X&j\V  
frame          ！frame改变坐标系的设置 CD0SXNi"zH  
legpos 600, 500  ！图行在图表窗口中的位置（相对于左上角而言） 8eoDE. }  
hx             ！平行于x方向网格 ?G-a:'1!6  
hy              ！平行于y方向网格 cYTX)]^u  
D9&FCCiUE  
f: P(pump, x),    ！命令f: 定义函数图；P(pump, x)函数是计算x位置处的泵浦光功率 Ih95&HsdC  
  color = red,  ！图形颜色 5G=CvGu  
  width = 3,   ！width线条宽度 f&>Q6 {*]  
  "pump"       ！相应的文本字符串标签 J`3pXc$.  
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 VuW&CnZ  
  color = blue,     h^0!I TL^  
  width = 3, Z5{M_^  
  "fw signal" s.I=H^T  
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 :FdV$E]]<  
  color = blue, $NWI_F4  
  style = fdashed, 'm"H*f  
  width = 3, /T*]RO4%>]  
  "bw signal" j:,*Liz  
;z7iUke0%  
f: 100 * n(x, 2),    ！n(x ,2) 函数是计算x位置处激活粒子数在能级2上的占比 B|~\m~  
  yscale = 2,            ！第二个y轴的缩放比例 @ B3@M  
  color = magenta, T ~t%3G  
  width = 3, UeT"v?zP  
  style = fdashed, G\IH b |  
  "n2 (%, right scale)" fr\UX}o  
66%kq[  
f: 100 * n(x, 3),          ！n(x ,3) 函数是计算x位置处激活粒子数在能级3上的占比 ^IM;D)X&:  
  yscale = 2, z{^XU"yB  
  color = red, *-Y
|qS%  
  width = 3, s4}}MV3X  
  style = fdashed, t9x.O  
  "n3 (%, right scale)" (85F1"Jp  
5kJ>pb$/  
{{=7mbc  
; ------------- c{#lKD<7  
diagram 2:                    ！输出图表2 -]PW\}w1  
f.'o4HSj  
"Variation ofthe Pump Power" 2Sb~tTGz79  
G#CWl),=  
x: 0, 10 W~Mj6c~S"  
"pump inputpower (W)", @x  c:~o e  
y: 0, 10 4- 6'  
y2: 0, 100 "$:nz}  
frame K#";!  
hx F{f "x
M  
hy ;nv4lxm  
legpos 150, 150 'L0 2lM  
3QS"n.d  
f: (set_P_in(pump, x);P_out(signal_fw)), ！set_P_in(pump,x)改变泵浦信道功率；P_out(signal_fw)输出前向信号光
^#%$?w>wI  
  step = 5, wEzLfZ Oz/  
  color = blue, Ctt{j'-[  
  width = 3, M6|Q~8$  
  "signal output power (W, leftscale)",     ！相应的文本字符串标签 G m<t2Csn  
  finish set_P_in(pump, P_pump_in) F=^vu7rf  
Jp5~iC2d  
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 {q8V
 
  yscale = 2, ?~S\^4]  
  step = 5, ]b<k%  
  color = magenta, -F|(Y1OE  
  width = 3, 6z=:x+m  
  "population of level 2 (%, rightscale)", I%*o7"  
  finish set_P_in(pump, P_pump_in) l= !KZaH  
%wvSD&oz  
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 3r^i>r8B  
  yscale = 2, c+|,2e 0T  
  step = 5, bUz7!M$  
  color = red, Z^`>;n2  
  width = 3, 0Km{fZYq7;  
  "population of level 3 (%, rightscale)", Ty#L%k}-t  
  finish set_P_in(pump, P_pump_in) -@L*i|A  
pU`Q[HOs  
)BS./zD*[<  
; ------------- ga~rllm;i  
diagram 3:                         ！输出图表3 &Cdk%@Tj]B  
Y@^MU->+  
"Variation ofthe Fiber Length" 3Xf}vdgdM$  
MWsBZJR
r  
x: 0.1, 5 0$/wH#f  
"fiber length(m)", @x i6(y Bn  
y: 0, 10 o& $Fc8bH  
"opticalpowers (W)", @y ~++y4NB8Q  
frame a{69JY5  
hx i~.L{
K  
hy J0lTp /  
R^fVwDl\  
f: (set_L(x);P_out(signal_fw)),     ！改变光纤长度对信号光输出功率的影响 MBDu0 [c  
  step = 20,             Gv6EJV1i  
  color = blue, eA#J7=eC  
  width = 3, ;l5F il,3  
  "signal output" ^B> 4:+^  
+`_%U7p(  
;f: (set_L(x);P_out(pump)),                     ！改变光纤长度对泵浦信号输出功率的影响 :%)l*[  
   step = 20, color = red, width = 3,"residual pump" Sep}{`u  
;wgm 'jr  
! set_L(L_f) {restore the original fiber length } K )1K ]  
(PE"_80Z  
,S}[48$  
; ------------- }O5c.3  
diagram 4:                                  ！输出图表4 KDwjck"5;  
T
Q.d|{B[  
"TransverseProfiles" B {f&'1pp/  
C-m OtI  
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) W<u63P  
q%"]}@a0  
x: 0, 1.4 * r_co /um >j_,3{eJ  
"radialposition (µm)", @x n4qj"xQ  
y: 0, 1.2 * I_max *cm^2 X@5!I+u\L  
"intensity (W/ cm&sup2;)", @y ^'*9,.ltd  
y2: 0, 1.3 * N_Tm AAxY{Z-4  
frame w,;CrW T2t  
hx *pyi;  
hy Fla,#uB  
ZVR0Kzu?Ra  
f: N_dop(1, x * um,0),      ！掺杂浓度的径向分布 ul>$vUbyf  
  yscale = 2, 2r,K/'  
  color = gray, `\(Fax  
  width = 3, j#9p0[  
  maxconnect = 1, $F`jM/B6  
  "N_dop (right scale)" ;Q:^|Fw!F  
`<8~tS/. w  
f: I(pump, -1, x *um, 0) * cm^2,    ！泵浦光沿光纤径向的强度分布 pZuYmMP  
  color = red, aRC>pK.  
  maxconnect = 1,           ！限制图形区域高度，修正为100%的高度 tb/bEy^  
  width = 3, J}hi)k  
  "pump" .&TJSIx$  
qi.|oL9p  
f: I(signal_fw, -1,x * um, 0) * cm^2,  ！信号光沿光纤径向的强度分布 88$G14aXEk  
  color = blue, #&\^{Z  
  maxconnect = 1, `QC{}Oo^  
  width = 3, "/[-U;ck  
  "signal" CY?]o4IV  
$oHlfV/!  
c_)vWU  
; ------------- WhMr'l/e  
diagram 5:                                  ！输出图表5 ~Wm`SIV  
;m,lS_[c  
"TransitionCross-sections" Yi1_oe  
Ultx|qU  
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) =4/LixsV|  
P)XkqOGpT9  
x: 1450, 2050 $Ud-aRlD  
"wavelength(nm)", @x $h`?l$jC(@  
y: 0, 0.6 !t3)j>h:  
"cross-sections(1e-24 m&sup2;)", @y .[? E1we  
frame ja$e)  
hx p^Kp= z  
hy )**k3u t4  
HIcx"y  
f: s12_Tm(x * nm) /1e-24,      ！Tm³⁺吸收截面与波长的关系 6+_)(+c  
  color = red, wc
iYv,  
  width = 3, R0(Nw7!d/[  
  "absorption" c (O+s/  
f: s21_Tm(x * nm) /1e-24,  ！Tm³⁺发射截面与波长的关系 /XjIm4EN  
  color = blue, ?C(Z\"IX  
  width = 3, {6!Mf+Xq  
  "emission" @]1E~  
X4>c(1e  

感谢，视频上有点看不清楚