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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

(* v|C)Q %v  
Demo for program"RP Fiber Power": thulium-doped fiber laser, -yHVydu=  
pumped at 790 nm. Across-relaxation process allows for efficient D *RF._  
population of theupper laser level. dVmI.A'nbp  
*)            !(*  *)注释语句 Ml1yk)3G  
55 )!cw4  
diagram shown: 1,2,3,4,5  !指定输出图表 Va/LMw  
; 1: "Powersvs. Position"     !分号是注释;光纤长度对功率的影响 Qctm"g|  
; 2:"Variation of the Pump Power"  !泵浦光功率变化对信号输出功率的影响 n|dLK.Q  
; 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 M)C. bo{p  
; 4:"Transverse Profiles"             !横向分布,横坐标为半径位置 fo9O+e s  
; 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 Xm`jD'G  
O?/\hZ"&c  
include"Units.inc"         !读取“Units.inc”文件中内容 c+c3C8s*8  
-(V]knIF  
include"Tm-silicate.inc"    !读取光谱数据 - } \g[|  
w-*$gk]   
; Basic fiberparameters:    !定义基本光纤参数 9oKRn c  
L_f := 4 { fiberlength }      !光纤长度 DksSD  
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 _IBI x\F  
r_co := 6 um { coreradius }                !纤芯半径 6"U&i9  
N_Tm := 100e24 { Tmdoping concentration }  !纤芯Tm离子掺杂浓度 TkXD#%nFY  
lp3 A B  
; Parameters of thechannels:                !定义光信道 R h zf.kp  
l_p := 790 nm {pump wavelength }                !泵浦光波长790nm !7 "-9n  
dir_p := forward {pump direction (forward or backward) }   !前向泵浦 H6X]D"Y,  
P_pump_in := 5 {input pump power }                    !输入泵浦功率5W I9O!CQCTt  
w_p := 50 um {radius of pump cladding }               !包层泵浦相应的半径 50um ac%%*HN,  
I_p(r) := (r <=w_p) { pump intensity profile }          !泵浦光强度分布 [ R1S+i  
loss_p := 0 {parasitic losses of pump wave }           !泵浦光寄生损耗为0 -Zc 6_]F|  
iD+Q\l;%  
l_s := 1940 nm {signal wavelength }                   !信号光波长1940nm E,&BP$B  
w_s := 7 um                          !信号光的半径 0(\ybppx  
I_s(r) := exp(-2 *(r / w_s)^2)            !信号光的高斯强度分布 UhQ[|c  
loss_s := 0                            !信号光寄生损耗为0 "W$,dWF  
(yIl]ZN*  
R_oc := 0.70 {output coupler reflectivity (right side) }      !输出耦合反射率 sJo]$/?F  
4^vEMq8lB  
; 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 (oO*|\9u  
calc U\'.rT[#  
  begin H'|b$rP0@  
    global allow all;                   !声明全局变量 M>^Ho2  
    set_fiber(L_f, No_z_steps, '');        !光纤参数 Q= IA|rN  
    add_ring(r_co, N_Tm); aTF~rAne<  
    def_ionsystem();              !光谱数据函数 LDqq'}qK6  
    pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p);  !泵浦光信道 @9~a3k|  
    signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward);      !前向信号光信道 .^j6  
    signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward);    !后向信号光信道 ]ZKmf}A)1P  
    set_R(signal_fw, 1, R_oc);                                 !设置反射率函数 ,DsqKXSU  
    finish_fiber();                                   g((glr)6M  
  end; CnyCEIO-  
]Tk3@jw+b  
; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 OZ<iP  
show "Outputpowers:"                                   !输出字符串Output powers: Ex2TV7I  
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) ,tJ%t#  
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) 5W_u|z+/g  
"\M16N  
8?#4<4Ql8  
; ------------- Q`k=VSUk  
diagram 1:                   !输出图表1 ov&4&v  
VL= .JwK  
"Powers vs.Position"          !图表名称 _1jd{? kt  
B@g 0QgA  
x: 0, L_f                      !命令x: 定义x坐标范围 6Yhd[I3  
"position infiber (m)", @x      !x轴标签;@x 指示这些字符串沿坐标轴放置 Si#I^aF`%  
y: 0, 15                      !命令y: 定义y坐标范围 /.{4 KW5  
y2: 0, 100                    !命令y2: 定义第二个y坐标范围 1Q1NircJ  
frame          !frame改变坐标系的设置 dU%Q=r8R  
legpos 600, 500  !图行在图表窗口中的位置(相对于左上角而言) .w=( G  
hx             !平行于x方向网格 j}R!'m(P'  
hy              !平行于y方向网格 1vKc>+9  
;mH O#  
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 tUouO0_l  
  color = red,  !图形颜色 *6D0>F  
  width = 3,   !width线条宽度 J60XUxf  
  "pump"       !相应的文本字符串标签 !]AM#LJ  
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 7x` dEi<  
  color = blue,     xL8r'gV@  
  width = 3, 2z9\p%MX  
  "fw signal" s;V~dxAiv  
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 h8@8Q w  
  color = blue, Sq^f}q  
  style = fdashed, .?{rd3[ec  
  width = 3, y)iT-$bQ  
  "bw signal" I\djZG$s;N  
9qc<m'MZ  
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 a+A^njk  
  yscale = 2,            !第二个y轴的缩放比例 YjaEKM8*  
  color = magenta, [>+R|;ln  
  width = 3, gB/4ro8  
  style = fdashed, /@Qg'Q#  
  "n2 (%, right scale)" On x[}x  
umPd+5i  
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 a@( 4X/|  
  yscale = 2, O[ tD7 !1  
  color = red, X"_,#3Ko!  
  width = 3, _BGw)Z 6  
  style = fdashed, Co[fq3iX#  
  "n3 (%, right scale)" |  RMIV  
2R9AYI  
J2A+x\{<  
; ------------- { FVLH:{U^  
diagram 2:                    !输出图表2 mS?.xu  
g'2'K  
"Variation ofthe Pump Power" ~)>O=nR  
K_/-mwA v  
x: 0, 10 vv='.R, D  
"pump inputpower (W)", @x ?,G CR1|4  
y: 0, 10 hP1}Do  
y2: 0, 100 ~ *:{U   
frame 7{<:g!  
hx [:M:6JJ  
hy +ob<? T  
legpos 150, 150 0 *!CJ;%N  
kLc}a5;  
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 OZ{YQ}t{^1  
  step = 5, JjBG9Rp{  
  color = blue, <dzfD;  
  width = 3, B~S"1EE[  
  "signal output power (W, leftscale)",     !相应的文本字符串标签 )qXl8HI  
  finish set_P_in(pump, P_pump_in) @tv3\eD  
+um Ua  
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 >q W_%  
  yscale = 2, Md!L@gX6<  
  step = 5, 5:3%RTLG  
  color = magenta, <{$0mUn;s|  
  width = 3, tJ:]ne   
  "population of level 2 (%, rightscale)", )6K Q"*  
  finish set_P_in(pump, P_pump_in) J\7ukm"9  
f P|rD[  
f: (set_P_in(pump,x); 100 * n_av(3)),   !改变泵浦信号功率对能级3上激活粒子占比的影响 &8kc0Z@y  
  yscale = 2, y"N7r1Pf  
  step = 5, QGv$~A[h  
  color = red, TVaD',5_V%  
  width = 3, 66A}5b4)]  
  "population of level 3 (%, rightscale)", rByC6HV"  
  finish set_P_in(pump, P_pump_in) #jY\l&E  
8:W," "  
*g0}pD;r  
; ------------- g&z)y  
diagram 3:                         !输出图表3 Xz/5 Wis4  
Xr?(w(3  
"Variation ofthe Fiber Length" OnD!*jy  
$e(]L(o;  
x: 0.1, 5 <d2?A}<  
"fiber length(m)", @x %BdQ.\4DS  
y: 0, 10 m 2tw[6M  
"opticalpowers (W)", @y q> ;u'3}  
frame n-HQk7=mQ  
hx E cS+/  
hy j$2rU'  
<n8K"(sy}  
f: (set_L(x);P_out(signal_fw)),     !改变光纤长度对信号光输出功率的影响 >[,ywRJ#_}  
  step = 20,             qG=?+em  
  color = blue, {VB n@^'s  
  width = 3, N)F&c!anh  
  "signal output" 1|]IWX|  
,tt .oF|  
;f: (set_L(x);P_out(pump)),                     !改变光纤长度对泵浦信号输出功率的影响 {2|[7oNT6  
   step = 20, color = red, width = 3,"residual pump" k,) xv?  
<K^{36h  
! set_L(L_f) {restore the original fiber length } B8XW+U  
D'{NEk@  
s^atBqw,  
; ------------- IJWUNKqo=  
diagram 4:                                  !输出图表4 +XaRwcLC.  
Se0!-NUK0  
"TransverseProfiles" [C8lMEV~  
#3b_ #+,  
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) 1z .  
*=sMJY9#jE  
x: 0, 1.4 * r_co /um }01c7/DRP<  
"radialposition (µm)", @x I:~KF/q  
y: 0, 1.2 * I_max *cm^2 cRR[ci34k  
"intensity (W/ cm&sup2;)", @y S JseP_-  
y2: 0, 1.3 * N_Tm *En29N#a{  
frame W6e,S[J^FY  
hx \&{a/e2:S  
hy fGeDygV^`  
(-<s[VnXP  
f: N_dop(1, x * um,0),      !掺杂浓度的径向分布 Q9i&]V[`  
  yscale = 2, k-:wM`C  
  color = gray, 3MmpB9l#H  
  width = 3, _H,xnh#nZ  
  maxconnect = 1, S.<aCN<@  
  "N_dop (right scale)" )bd)noZi  
3/aK#TjK  
f: I(pump, -1, x *um, 0) * cm^2,    !泵浦光沿光纤径向的强度分布 mJ_ 5Vt=  
  color = red, QLs9W& PG  
  maxconnect = 1,           !限制图形区域高度,修正为100%的高度 bv&#ay 7  
  width = 3, cEdf&*_-'I  
  "pump" Po)!vL"   
mp !S<m  
f: I(signal_fw, -1,x * um, 0) * cm^2,  !信号光沿光纤径向的强度分布 S'%|40U  
  color = blue, |41NRGgY  
  maxconnect = 1, 0[# zn  
  width = 3, 4# L}&  
  "signal" D]?eRO9'  
Gu#Vc.e  
jkQ%b.a  
; ------------- .83{NF  
diagram 5:                                  !输出图表5 Jbv[Ql#  
`{Jo>L .  
"TransitionCross-sections" <UEta>jj  
\80W?9qj  
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) ~E8L,h~  
#`HY"-7m_  
x: 1450, 2050 /e:kBjysJ  
"wavelength(nm)", @x 5LF&C0v  
y: 0, 0.6 18HmS>Qo  
"cross-sections(1e-24 m&sup2;)", @y QX`T-)T e  
frame r6b;v2!8  
hx Uh w:XV@m  
hy ^t$xR_  
8PB 8h  
f: s12_Tm(x * nm) /1e-24,      !Tm3+吸收截面与波长的关系 2Y7u M;8  
  color = red, t=;P1d?E;  
  width = 3, >p`ZcFNs"  
  "absorption" yrF"`/zv6|  
f: s21_Tm(x * nm) /1e-24,  !Tm3+发射截面与波长的关系 TwI'}J|w  
  color = blue, =pCO1<wR  
  width = 3, ^[6S]Ft(  
  "emission" iW9o-W a  
(-[73v-w  
lileisgsz 2021-09-28 09:47
感谢,视频上有点看不清楚
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