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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

(* R<n8M"B  
Demo for program"RP Fiber Power": thulium-doped fiber laser, 1P[I}GW#  
pumped at 790 nm. Across-relaxation process allows for efficient "ibK1}-  
population of theupper laser level. _l24Ba$F6  
*)            !(*  *)注释语句 P9 {}&z%:  
i7S>RB  
diagram shown: 1,2,3,4,5  !指定输出图表 ig{A[7qN  
; 1: "Powersvs. Position"     !分号是注释;光纤长度对功率的影响 6CcB-@n4  
; 2:"Variation of the Pump Power"  !泵浦光功率变化对信号输出功率的影响 -Q<z1vz  
; 3:"Variation of the Fiber Length"!信号输出功率vs 光纤长度的变化,仿真最佳光纤长度 bGZ hUEq  
; 4:"Transverse Profiles"             !横向分布,横坐标为半径位置 22)0zY%\  
; 5:"Transition Cross-sections"    !不同波长的跃迁横截面,横坐标波长,纵坐标为横截面 Jh37pI  
a&$Zpf!!  
include"Units.inc"         !读取“Units.inc”文件中内容 E fP>O  
6Gs{nFw  
include"Tm-silicate.inc"    !读取光谱数据 K-2.E  
4*0:bhhhf_  
; Basic fiberparameters:    !定义基本光纤参数 v2/yw,  
L_f := 4 { fiberlength }      !光纤长度 zyaW3th  
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 z $9@j2  
r_co := 6 um { coreradius }                !纤芯半径 rQ`\JE&`  
N_Tm := 100e24 { Tmdoping concentration }  !纤芯Tm离子掺杂浓度 ~A8qeaP  
d{QMST2&  
; Parameters of thechannels:                !定义光信道 BCBEX&0hk{  
l_p := 790 nm {pump wavelength }                !泵浦光波长790nm %/UV_@x&  
dir_p := forward {pump direction (forward or backward) }   !前向泵浦 X}zX`]:I'  
P_pump_in := 5 {input pump power }                    !输入泵浦功率5W nGq]$h  
w_p := 50 um {radius of pump cladding }               !包层泵浦相应的半径 50um ! 9d _Gf-  
I_p(r) := (r <=w_p) { pump intensity profile }          !泵浦光强度分布 ~gu=x&{  
loss_p := 0 {parasitic losses of pump wave }           !泵浦光寄生损耗为0 u|(Ux~O  
J+{Ou rWt  
l_s := 1940 nm {signal wavelength }                   !信号光波长1940nm b->eg 8|  
w_s := 7 um                          !信号光的半径 n 11LxGwk  
I_s(r) := exp(-2 *(r / w_s)^2)            !信号光的高斯强度分布 -h>Z,-DE6  
loss_s := 0                            !信号光寄生损耗为0 \:]DFZ=!  
yOX&cZ[  
R_oc := 0.70 {output coupler reflectivity (right side) }      !输出耦合反射率 ~c9>Nr9|`  
L/Hv4={  
; 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 rpUy$qrRc  
calc 6D/uo$1Y  
  begin <KKDu$W|T  
    global allow all;                   !声明全局变量 Wt>J`  
    set_fiber(L_f, No_z_steps, '');        !光纤参数 TG1P=g5h  
    add_ring(r_co, N_Tm); SXQ@;= ]xV  
    def_ionsystem();              !光谱数据函数 Dq?E\  
    pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p);  !泵浦光信道 &svx@wW  
    signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward);      !前向信号光信道 $[[?;g  
    signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward);    !后向信号光信道 RG&I\DTyt  
    set_R(signal_fw, 1, R_oc);                                 !设置反射率函数 T |37#*c  
    finish_fiber();                                   24/ /21m  
  end; `q%U{IR  
'9'l=Sh  
; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 },rav]  
show "Outputpowers:"                                   !输出字符串Output powers: 9*4 .  
show"pump:     ", P_out(pump):d3:"W"  !输出字符串pump:和计算值(格式为3个有效数字,单位W) ovo/!YJ2  
show"signal:   ",P_out(signal_fw):d3:"W" !输出字符串signal:和计算值(格式为3个有效数字,单位W) ar Q)%W  
<O.Kqk* nq  
+fM&su=wl  
; -------------  #;`Oj  
diagram 1:                   !输出图表1 L~IE,4  
K]X` sH:  
"Powers vs.Position"          !图表名称 gc##V]OD  
ZI,j?i6\  
x: 0, L_f                      !命令x: 定义x坐标范围 /?Vdqci  
"position infiber (m)", @x      !x轴标签;@x 指示这些字符串沿坐标轴放置 J7:9_/ e0T  
y: 0, 15                      !命令y: 定义y坐标范围 W]_g4,T>  
y2: 0, 100                    !命令y2: 定义第二个y坐标范围 [q1Unm  
frame          !frame改变坐标系的设置 :V-k'hm &  
legpos 600, 500  !图行在图表窗口中的位置(相对于左上角而言) "# 2pT H~  
hx             !平行于x方向网格 f27)v(EJ  
hy              !平行于y方向网格 6JSY56v  
(%bE~Q2P*<  
f: P(pump, x),    !命令f: 定义函数图;P(pump, x)函数是计算x位置处的泵浦光功率 UgR :qjI  
  color = red,  !图形颜色 R"Kz!NTB  
  width = 3,   !width线条宽度 X'f)7RbT  
  "pump"       !相应的文本字符串标签 ]BfS270  
f: P(signal_fw, x),  !P(signal_fw ,x) 函数是计算x位置处的前向信号光功率 _%{0?|=  
  color = blue,     'G8 ?'u_)  
  width = 3, OqBC/p B  
  "fw signal" @T ysXx  
f: P(signal_bw, x),   !P(signal_bw ,x) 函数是计算x位置处的后向信号光功率 )|pU.K9qZ  
  color = blue, h$pk<<  
  style = fdashed, 3htq[Ren  
  width = 3, fJy)STQ4  
  "bw signal" B!}BM}r  
`a >?UUT4  
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 0oSQY[ht/  
  yscale = 2,            !第二个y轴的缩放比例 X'x3esw w  
  color = magenta, 9/@ &*  
  width = 3, ? Vp%=E  
  style = fdashed, 1[SA15h  
  "n2 (%, right scale)" m; o4Fu  
Iyyo3awc  
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 P$ucL~r  
  yscale = 2, =WK04\H  
  color = red, n(>C'<otj  
  width = 3, p x#suy  
  style = fdashed, =IZ[_ /@  
  "n3 (%, right scale)" @}DFp`~5|  
;1`!wG-DD  
#by Jqy&e  
; ------------- O9^T3~x[V  
diagram 2:                    !输出图表2 .x-J44i@/  
_R^y\1Qu  
"Variation ofthe Pump Power" ?YBaO,G9o  
X?/Lz;,&  
x: 0, 10 vk'rA{x  
"pump inputpower (W)", @x L^FcS\r;  
y: 0, 10  $:EG%jl  
y2: 0, 100 j (ygQ4T  
frame jj,r <T  
hx w"8V0z  
hy _ie.|4k  
legpos 150, 150 Vb!O8xV4;+  
\uM? S  
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 V_"f|[1  
  step = 5, pOA!#Aj)  
  color = blue, ".P){Dep$4  
  width = 3, !E0!-UpY  
  "signal output power (W, leftscale)",     !相应的文本字符串标签 Kkv<"^H  
  finish set_P_in(pump, P_pump_in) -V5w]F'  
OJ1tV% E  
f: (set_P_in(pump,x); 100 * n_av(2)),   !改变泵浦信号功率对能级2上激活粒子占比的影响 %>zjGF<  
  yscale = 2, OlY$ v@|  
  step = 5, <a|@t@R  
  color = magenta, %e? fH.)  
  width = 3, m`}{V5;  
  "population of level 2 (%, rightscale)", #U ASH&  
  finish set_P_in(pump, P_pump_in) E\M-k\cSj  
x[i`S8D  
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 BStk&b  
  yscale = 2, K_ke2{4Jm  
  step = 5, 5=L} \ankn  
  color = red, h@1!T  
  width = 3, ] fwZAU  
  "population of level 3 (%, rightscale)", !SxG(*u  
  finish set_P_in(pump, P_pump_in) _<*Hv*Zm  
P@0Y./Ds  
LFf`K)q  
; ------------- M%`\P\A  
diagram 3:                         !输出图表3 h|)vv4-d|  
: ]WqfR)#  
"Variation ofthe Fiber Length" mL yBm  
BKIjNV3  
x: 0.1, 5 [6tSYUZs  
"fiber length(m)", @x $yu?.b 9H#  
y: 0, 10 wtH~-xSB|  
"opticalpowers (W)", @y p&Ed\aQ%z;  
frame rHz||jjU  
hx _}gtcyx  
hy )uheV,ZnY  
T .n4TmF  
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 Or0O/\D)  
  step = 20,             '@=PGpRF  
  color = blue,  L,LNv  
  width = 3, 6b=q-0yj  
  "signal output" ~Z)/RT/  
szmmu*F,U:  
;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 s?C&s|'.  
   step = 20, color = red, width = 3,"residual pump" =#xK=pRy;  
sa&) #Z:  
! set_L(L_f) {restore the original fiber length } . iwZ*b{  
j/!H$0PN  
/)L 0`:I#  
; ------------- `T&jPA9eY  
diagram 4:                                  !输出图表4 @It>*B yB.  
}q[Bd  
"TransverseProfiles" O7G"sT1Dv  
6iA( o*'Yn  
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) L{fFC%|l2L  
u bW]-U=T  
x: 0, 1.4 * r_co /um d+fSo SjX8  
"radialposition (µm)", @x ~d >W?A  
y: 0, 1.2 * I_max *cm^2 gVR@&bi7  
"intensity (W/ cm&sup2;)", @y +&=?BC}L9^  
y2: 0, 1.3 * N_Tm jp2Q 9Z  
frame B&?sF" Y  
hx Af(WV>'  
hy pY"O9x  
,  X{>  
f: N_dop(1, x * um,0),      !掺杂浓度的径向分布 L=; -x9  
  yscale = 2, |CFRJN-J"  
  color = gray, 9i q""  
  width = 3, p{$p $/A  
  maxconnect = 1, b;cMl'  
  "N_dop (right scale)" G&f8n  
pv)`%<  
f: I(pump, -1, x *um, 0) * cm^2,    !泵浦光沿光纤径向的强度分布 \}0-^(9zd  
  color = red, \;X+X,M  
  maxconnect = 1,           !限制图形区域高度,修正为100%的高度 dt\jGD  
  width = 3, 2}U!:bn(  
  "pump" &HZmQ>!R D  
Di.3113t  
f: I(signal_fw, -1,x * um, 0) * cm^2,  !信号光沿光纤径向的强度分布 %/%UX{8R  
  color = blue, C~% 1w%nn  
  maxconnect = 1, }28=  
  width = 3, 7V7zGx+Z7  
  "signal" ?#A]{l  
e GL1  
oXsL9,  
; ------------- J9~i%hzr  
diagram 5:                                  !输出图表5 I0'WOV70  
m"eteA,"k_  
"TransitionCross-sections" kS5_&#  
KJn!Ap  
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) O`1!  
),:c+~@@kT  
x: 1450, 2050 (rtY!<|p  
"wavelength(nm)", @x 1 T<+d5[C  
y: 0, 0.6 K>:]Bx#F7  
"cross-sections(1e-24 m&sup2;)", @y ] y{WD=T  
frame qy1F* kY  
hx +0wT!DZW\=  
hy igL<g  
<6TT)t<h  
f: s12_Tm(x * nm) /1e-24,      !Tm3+吸收截面与波长的关系 *A'FC|\  
  color = red, ,8'>R@o  
  width = 3, yM.IxpT#$  
  "absorption" "ICC B1N|  
f: s21_Tm(x * nm) /1e-24,  !Tm3+发射截面与波长的关系 oTjyN\?H  
  color = blue, ;h=*!7:  
  width = 3, VXBY8;+Yp  
  "emission"  D1 Z{W  
Oc].@Jy  
lileisgsz 2021-09-28 09:47
感谢,视频上有点看不清楚
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