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

(* !CWe1Dm  
Demo for program"RP Fiber Power": thulium-doped fiber laser, 4_kN';a4Q  
pumped at 790 nm. Across-relaxation process allows for efficient 4lB??`UN  
population of theupper laser level. (_zlCHB  
*)            ！（*  *）注释语句 8s$6R|ti  
D<;~eZ'  
diagram shown: 1,2,3,4,5  ！指定输出图表 @wgd 3BU  
; 1: "Powersvs. Position"     ！分号是注释；光纤长度对功率的影响 0o=HOCL\  
; 2:"Variation of the Pump Power"  ！泵浦光功率变化对信号输出功率的影响 Zt!A!Afu  
; 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 zo(#tQ-'m  
; 4:"Transverse Profiles"             ！横向分布，横坐标为半径位置 OALNZKP  
; 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 2Q
p}f^  
h9)fXW
 
include"Units.inc"         ！读取“Units.inc”文件中内容 \4q|Qno8  
RkYn6  
include"Tm-silicate.inc"    ！读取光谱数据 Q2VF+g,  
1j$\ 48
Z  
; Basic fiberparameters:    ！定义基本光纤参数 G n]qh(N>  
L_f := 4 { fiberlength }      ！光纤长度 CpO_p%P  
No_z_steps := 50 {no steps along the fiber } ！光纤步长，大括号{ }是注释，相当于备注 E(P 6s;LZ  
r_co := 6 um { coreradius }                ！纤芯半径 h6 {vbYj  
N_Tm := 100e24 { Tmdoping concentration }  ！纤芯Tm离子掺杂浓度 `y3'v]  
8x U*j  
; Parameters of thechannels:                ！定义光信道 k0e}`#t  
l_p := 790 nm {pump wavelength }                ！泵浦光波长790nm I_<XL
<  
dir_p := forward {pump direction (forward or backward) }   ！前向泵浦 +gX
,r$bX  
P_pump_in := 5 {input pump power }                    ！输入泵浦功率5W Nnl3r@  
w_p := 50 um {radius of pump cladding }               ！包层泵浦相应的半径 50um /RxP:>hVv  
I_p(r) := (r <=w_p) { pump intensity profile }          ！泵浦光强度分布 =EP`,zqn$9  
loss_p := 0 {parasitic losses of pump wave }           ！泵浦光寄生损耗为0 </{Zb.  
C7FQc{  
l_s := 1940 nm {signal wavelength }                   ！信号光波长1940nm sQa;l]O:NC  
w_s := 7 um                          ！信号光的半径 D=-}&w_T"  
I_s(r) := exp(-2 *(r / w_s)^2)            ！信号光的高斯强度分布 dT|f<E/P  
loss_s := 0                            ！信号光寄生损耗为0 /h0
bBP  
ZwS:Te9-  
R_oc := 0.70 {output coupler reflectivity (right side) }      ！输出耦合反射率 Tu#;Y."T  
iYStl  
; Function for defining themodel:   ！定义模型函数，一定要有calc命令，否则函数只会被定义，但不会被执行 F3}MM dX  
calc '`P%;/z  
  begin %+(AKZu:  
    global allow all;                   ！声明全局变量 /l*v *tl  
    set_fiber(L_f, No_z_steps, '');        ！光纤参数 ('5?-  
    add_ring(r_co, N_Tm); OOqT0wN  
    def_ionsystem();              ！光谱数据函数 < '5~p$  
    pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p);  ！泵浦光信道 KdR4<qVV}  
    signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward);      ！前向信号光信道 &u.{]Yjx  
    signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward);    ！后向信号光信道 &:&89<C'  
    set_R(signal_fw, 1, R_oc);                                 ！设置反射率函数 zFq%[X  
    finish_fiber();                                   W`;;fJe  
  end; ^3$l!>me  
/| v.A\:  
; Display someoutputs in the Output window (on the right side): ！在Output aera区域显示输出 Jj-\Eb?  
show "Outputpowers:"                                   ！输出字符串Output powers： OyZR&,q  
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） uQ5h5Cfz  
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） DXLXGvcM  
fjRVYOG#  
IL].!9
  
; ------------- >!=@TK(~  
diagram 1:                   !输出图表1 UX)GA[WI  
_Op%H)  
"Powers vs.Position"          ！图表名称 |Kd#pYt%O  
~rb0G*R>  
x: 0, L_f                      ！命令x: 定义x坐标范围 0^ODJ7  
"position infiber (m)", @x      ！x轴标签；@x 指示这些字符串沿坐标轴放置 rwF$aR>9  
y: 0, 15                      ！命令y: 定义y坐标范围 Qg*\aa94  
y2: 0, 100                    ！命令y2: 定义第二个y坐标范围 SyvoN,;Q  
frame          ！frame改变坐标系的设置 Bu{Kjv  
legpos 600, 500  ！图行在图表窗口中的位置（相对于左上角而言） {@InOo!4w]  
hx             ！平行于x方向网格 ?"x4u#x  
hy              ！平行于y方向网格 (;l
@d|g  
kTb$lLG\xk  
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 Je6[q  
  color = red,  ！图形颜色 b#6S8C+@  
  width = 3,   ！width线条宽度 ipv5JD[  
  "pump"       ！相应的文本字符串标签  Z1 D  
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 G^c,i5}w  
  color = blue,     Mn0.!J "  
  width = 3, yLa@27T\A  
  "fw signal" 9M96$i`P  
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 Z=JKBoAY  
  color = blue, X1^VdJE  
  style = fdashed, ^Oz~T
|)  
  width = 3, 46:<[0Psl/  
  "bw signal" cgb>Naa<  
-nb U5o  
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 F
-;JN  
  yscale = 2,            ！第二个y轴的缩放比例 ?@"@9na  
  color = magenta, i2qN 0?n  
  width = 3, V;SfW2`)  
  style = fdashed, +Br<;sW  
  "n2 (%, right scale)" u3h(EAH>  
k\OZ'dS  
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 JU8}TX  
  yscale = 2, $JFjR@j  
  color = red, Oc)n,D)0  
  width = 3, a ,mgM&yD  
  style = fdashed, (PpY*jKR  
  "n3 (%, right scale)"  Q6 *n'6  
().C
  
Ab$E@H#  
; ------------- maapX/J  
diagram 2:                    ！输出图表2 Y9abRrK  
#(]D]f[@  
"Variation ofthe Pump Power" Sm/8VSY  
`gl?y;xC  
x: 0, 10 &^ERaPynd  
"pump inputpower (W)", @x H [+'>Id:  
y: 0, 10 J.~@j;[2  
y2: 0, 100 ` k] TOc  
frame =o@}~G&HA  
hx !+$qSD,%x  
hy {r&r^!K;  
legpos 150, 150 " lD -*e4  
Pr>$m{ Z  
f: (set_P_in(pump, x);P_out(signal_fw)), ！set_P_in(pump,x)改变泵浦信道功率；P_out(signal_fw)输出前向信号光 R655@|RT  
  step = 5, Qe~C}j%  
  color = blue, 51}C`j|V3{  
  width = 3, -dMH>e0  
  "signal output power (W, leftscale)",     ！相应的文本字符串标签 wW TuEM  
  finish set_P_in(pump, P_pump_in) @#wG)TA  
_3 !s{  
f: (set_P_in(pump,x); 100 * n_av(2)),   ！改变泵浦信号功率对能级2上激活粒子占比的影响 8h ol4'B  
  yscale = 2, .Z7tE?  
  step = 5, /:!sn-(  
  color = magenta, ]`-o\,lq  
  width = 3, |TJ gH<I  
  "population of level 2 (%, rightscale)", +^:uPW^U  
  finish set_P_in(pump, P_pump_in) K`=U5vG^  
eI|FrBq%  
f: (set_P_in(pump,x); 100 * n_av(3)),   ！改变泵浦信号功率对能级3上激活粒子占比的影响 YWPkVvI  
  yscale = 2, s\'t=}0q  
  step = 5, tdU'cc?M  
  color = red, ZV Ko$q:F  
  width = 3, , wk}[MF  
  "population of level 3 (%, rightscale)", kU:Q&[/jzH  
  finish set_P_in(pump, P_pump_in) 4gZR!J  
G>dXK,f<B0  
?(s9dS,7wZ  
; ------------- qPu?rU{2  
diagram 3:                         ！输出图表3 %m|BXyf]_B  
]_ LAy  
"Variation ofthe Fiber Length" 89[/UxM)  
i?>
>%juK  
x: 0.1, 5 BDN}`F[F  
"fiber length(m)", @x xqT} 9,  
y: 0, 10 iLdUus!  
"opticalpowers (W)", @y "dG*HKrr  
frame M!G/5:VZ  
hx nJH'^rO!C  
hy __z/X"H  
TGpdl`k\T  
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 :hHKm|1FE  
  step = 20,             &~"N/o  
  color = blue, 7WV"Wrl]  
  width = 3, Jcvp<  
  "signal output" ='#7yVVcs  
fN`Prs A  
;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 U
SE!  
   step = 20, color = red, width = 3,"residual pump" (>Sy,  
T+V:vuK  
! set_L(L_f) {restore the original fiber length } 45+kwo0  
hzV%QDUpe  
sI)jqHZG  
; ------------- &Ai+t2  
diagram 4:                                  ！输出图表4 @ /e{-Q  
.j!:Hp(z}  
"TransverseProfiles" _=w=!U
&W  
'mU\X!- 4<  
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) Vg7+G( ,  
q|.0Ja  
x: 0, 1.4 * r_co /um q!d7Ms{q  
"radialposition (µm)", @x rp-.\Hl/a  
y: 0, 1.2 * I_max *cm^2 w
h]v{Fi'  
"intensity (W/ cm&sup2;)", @y <t*3w  
y2: 0, 1.3 * N_Tm ]{-ib:f
~  
frame Dk~ JH9#  
hx `yXHb  
hy K>+c2;
t;  
N8wA">u  
f: N_dop(1, x * um,0),      ！掺杂浓度的径向分布 o<S(ODOfi  
  yscale = 2, Xp^71A?>  
  color = gray, =rNI&K_<  
  width = 3, Jl)Q#  
  maxconnect = 1, yV@~B;eW0  
  "N_dop (right scale)" K?wo AuY  
EU7mP MxJ  
f: I(pump, -1, x *um, 0) * cm^2,    ！泵浦光沿光纤径向的强度分布 Nrp1`qY  
  color = red, ]gb?3a}A  
  maxconnect = 1,           ！限制图形区域高度，修正为100%的高度 B?XqH_=0L  
  width = 3, -1F
+,+m  
  "pump" j&?@:Zg v  
w##$SaT
I  
f: I(signal_fw, -1,x * um, 0) * cm^2,  ！信号光沿光纤径向的强度分布 &W y9%  
  color = blue, cZ/VMQEr  
  maxconnect = 1, @}e5T/{X}T  
  width = 3, L6pw'1'  
  "signal" DTV"~>@  
1`&"U[{  
,3ivB8  
; ------------- ^X?3e1om  
diagram 5:                                  ！输出图表5 s4\_%je<v  
~p/1 9/  
"TransitionCross-sections" n ^C"v6X  
[tz}H&  
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) [)p>pA2GZj  
>]8H@. \  
x: 1450, 2050 NHzhGg]  
"wavelength(nm)", @x (^Hpe5h&  
y: 0, 0.6 tsTCZ);(  
"cross-sections(1e-24 m&sup2;)", @y ~d6zpQf7>  
frame $]]|#}J  
hx .37Jrh0Iv  
hy arj?U=zy  
-6>T0-  
f: s12_Tm(x * nm) /1e-24,      ！Tm³⁺吸收截面与波长的关系 e/!xyd  
  color = red, g)~"-uQQ  
  width = 3, )KD*G;<O]L  
  "absorption" 5@@ilvwzz  
f: s21_Tm(x * nm) /1e-24,  ！Tm³⁺发射截面与波长的关系 sq'bo8r  
  color = blue, 0W>,RR)  
  width = 3,  HO =\  
  "emission" _0e;&2')  
r5aOQ  

感谢，视频上有点看不清楚