(* {aC!~qR
Demo for program"RP Fiber Power": thulium-doped fiber laser,
\qR %%S
pumped at 790 nm. Across-relaxation process allows for efficient fpN-
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population of theupper laser level. %T9 sz4V
*) !(* *)注释语句 1`9xIm*9w
${nX:!)
diagram shown: 1,2,3,4,5 !指定输出图表 n`
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; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 UNi`P9D]3
; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 AT)a :i
; 3:"Variation of the Fiber Length"!信号输出功率vs 光纤长度的变化,仿真最佳光纤长度 7ei|XfR
; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 /?1nHBYPM
; 5:"Transition Cross-sections" !不同波长的跃迁横截面,横坐标波长,纵坐标为横截面 ]$\|ktY!
=)`
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include"Units.inc" !读取“Units.inc”文件中内容 [ $T(WGF
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include"Tm-silicate.inc" !读取光谱数据 { F}; n?'
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; Basic fiberparameters: !定义基本光纤参数 \7
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L_f := 4 { fiberlength } !光纤长度 [wB9s{CX
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 gxMfu?zk"
r_co := 6 um { coreradius } !纤芯半径 FSbHn{@
N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 t/PlcV_M"
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; Parameters of thechannels: !定义光信道 gOK\%&S]
l_p := 790 nm {pump wavelength } !泵浦光波长790nm )&<=.q
dir_p := forward {pump direction (forward or backward) } !前向泵浦 %F*|;o7 s
P_pump_in := 5 {input pump power } !输入泵浦功率5W 1#4PG'H
w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um RTu4@7XP
I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 >xn}N6Rj2~
loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 |s)?cpb
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l_s := 1940 nm {signal wavelength } !信号光波长1940nm KyO8A2'U
w_s := 7 um !信号光的半径 nbTVU+
I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 [
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loss_s := 0 !信号光寄生损耗为0 "A)("
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R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 34R!x6W0
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; 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 vHE^"l5 v
calc eVcANP
begin %D`,k*X
global allow all; !声明全局变量 'XUKN/.
set_fiber(L_f, No_z_steps, ''); !光纤参数 DF{Qw@P!
add_ring(r_co, N_Tm); Q!FLR>8
def_ionsystem(); !光谱数据函数 X5*C+ I=2
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 O!Z|r?
signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 45H!;Qsk
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 ^U8r0]9
set_R(signal_fw, 1, R_oc); !设置反射率函数 9r2IuS0
finish_fiber();
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end; 35*\_9/#
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; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 uGl| pJ\y=
show "Outputpowers:" !输出字符串Output powers: y9|K|xO[
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) T=YzJyQC)
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) w_iam qe,
Bz`yfl2
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; ------------- zK+52jhi
diagram 1: !输出图表1 pNE(n4v
N|2y"5
"Powers vs.Position" !图表名称 -)y%~Zn
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x: 0, L_f !命令x: 定义x坐标范围 b( ^^m:(w
"position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 jAsO8
y: 0, 15 !命令y: 定义y坐标范围 e[t<<u3"
y2: 0, 100 !命令y2: 定义第二个y坐标范围 (,xZGa
frame !frame改变坐标系的设置 9%iFV
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legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) I6LD)?
hx !平行于x方向网格 J:F^
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hy !平行于y方向网格 U~2`P
k,Zm GllQ]
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 2PSTGG8JV
color = red, !图形颜色 - n6jG}01b
width = 3, !width线条宽度 XDD<oo
"pump" !相应的文本字符串标签 $YG1z
f: P(signal_fw, x), !P(signal_fw ,x) 函数是计算x位置处的前向信号光功率 8"vwU@cfC
color = blue, qsg>5E
width = 3, g9my=gY
"fw signal" H%z@h~s>
f: P(signal_bw, x), !P(signal_bw ,x) 函数是计算x位置处的后向信号光功率 lg1PE7
color = blue, !@
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style = fdashed, 1{2eY%+C
width = 3,
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"bw signal" '?Iif#Z1
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f: 100 * n(x, 2), !n(x ,2) 函数是计算x位置处激活粒子数在能级2上的占比 ;' e@t8i6
yscale = 2, !第二个y轴的缩放比例 ad`_>lA4Lp
color = magenta, }1%r%TikY
width = 3, [D'Gr*5~{
style = fdashed, px9>:t[P
"n2 (%, right scale)" f3
]
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f: 100 * n(x, 3), !n(x ,3) 函数是计算x位置处激活粒子数在能级3上的占比 }G1&]Wt_
yscale = 2, z4}
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color = red, Y&'8VdW
width = 3, ?|t/mo|K?
style = fdashed, Kv+Bfh
"n3 (%, right scale)" '0+$ m=
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YF
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; ------------- |tG+iF@4
diagram 2: !输出图表2 `%E9xcD%
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"Variation ofthe Pump Power" < `Z%O<X
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x: 0, 10 ~/`X*n&
"pump inputpower (W)", @x {:Vf0Mhb
y: 0, 10 $+:(f{Va*
y2: 0, 100 vg5NY =O
frame mpef]9
hx 9)yG.9d1
hy R^Bk]
legpos 150, 150 1| xN%27>
V8'`nuC+
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 "r-l8r,
step = 5, o?!uX|Fy
color = blue, cztS]dcf>~
width = 3, u3wL<$2[8
"signal output power (W, leftscale)", !相应的文本字符串标签 pVOI5>f\
finish set_P_in(pump, P_pump_in) -fux2?8M
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f: (set_P_in(pump,x); 100 * n_av(2)), !改变泵浦信号功率对能级2上激活粒子占比的影响 Jqg3.2q
yscale = 2, 5L&:_iQZy
step = 5, Mj~${vj
color = magenta, 8t9aHla
width = 3, 98<zCSe\]
"population of level 2 (%, rightscale)", glor+
finish set_P_in(pump, P_pump_in) DM2Q1Dh3
%\yK5V5
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 /w~C~6z
@!
yscale = 2, B+D`\ Nl o
step = 5, W#45a.v
color = red, MYTS3(
width = 3,
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"population of level 3 (%, rightscale)", %UmbDGDWI
finish set_P_in(pump, P_pump_in) ]7F)bIG[
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; ------------- cMtJy"kK
diagram 3: !输出图表3 n^6TP'r
aL$j/SC
"Variation ofthe Fiber Length" M,L@k
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x: 0.1, 5 8DT@h8tA
"fiber length(m)", @x 0|Q.U
y: 0, 10 L{K*~B -p
"opticalpowers (W)", @y R`7n^,
frame 3YRBI|XO
hx 7xR|_+%~K
hy t>@yv#
h*l4Y!7
f: (set_L(x);P_out(signal_fw)), !改变光纤长度对信号光输出功率的影响 n +dJc
step = 20, 5@.zz"o.`
color = blue, .9I_NG
width = 3, s'AQUUrb<
"signal output" L)G">T;
'Ix5,^M}B
;f: (set_L(x);P_out(pump)), !改变光纤长度对泵浦信号输出功率的影响 )x9]xqoR
step = 20, color = red, width = 3,"residual pump" 7CYH'DL
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! set_L(L_f) {restore the original fiber length } ]kH}lr
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; ------------- Qq>ElQ@
diagram 4: !输出图表4 !
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"TransverseProfiles" A<;0L . J
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I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) <M`-`v6H
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x: 0, 1.4 * r_co /um 5A;"jp^ Z
"radialposition (µm)", @x [5-!d!a|st
y: 0, 1.2 * I_max *cm^2 x:vrK#8D>
"intensity (W/ cm²)", @y (S 3jZ
y2: 0, 1.3 * N_Tm 4Z],+?.[
frame }P16Xb)p
hx qY# m*R
hy @#1cx
zAu}hVcW
f: N_dop(1, x * um,0), !掺杂浓度的径向分布 F1/6&u9I
yscale = 2, gnYnL8l`J
color = gray, IS .g);Gj
width = 3, I S.F
maxconnect = 1, T?ZOHH8
"N_dop (right scale)" .k
p$oAL
# e$\~c Pd
f: I(pump, -1, x *um, 0) * cm^2, !泵浦光沿光纤径向的强度分布 |@OJ~5H/{
color = red, s%FP6u7[i
maxconnect = 1, !限制图形区域高度,修正为100%的高度 -uO%[/h;N
width = 3, 5~*=#v:`
"pump" %{=4Fa(Jux
M3)v-"
f: I(signal_fw, -1,x * um, 0) * cm^2, !信号光沿光纤径向的强度分布 ?i/73H+;D3
color = blue, 2c!h2$w
maxconnect = 1, d|R
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width = 3, GsR-#tV@
"signal" `9]P/J^
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; ------------- ]cS&8{ ^2
diagram 5: !输出图表5 .Y+mwvLpRG
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"TransitionCross-sections" `6dy
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I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) :17ee
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x: 1450, 2050 #tCIuQ,
"wavelength(nm)", @x ;D6x=v=2
y: 0, 0.6 $z~jnc
"cross-sections(1e-24 m²)", @y m>g}IX&K'
frame F%w\D9+P
hx hQ\#Fhu7
hy Rs`Vr_?Hk
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f: s12_Tm(x * nm) /1e-24, !Tm3+吸收截面与波长的关系 c-?
Ygr
color = red, DX]z=d)tc
width = 3, PEMxoe<+
"absorption" 3 (Gygq#
f: s21_Tm(x * nm) /1e-24, !Tm3+发射截面与波长的关系 1Kp?bwh"u
color = blue, $Vd?K@W[h
width = 3, ^xBb$
"emission" _:oMyK'
.N?|t$J