(* y3o4%K8
Demo for program"RP Fiber Power": thulium-doped fiber laser, nu<!2xs,
pumped at 790 nm. Across-relaxation process allows for efficient :PjUl
population of theupper laser level. ;|$]Qq
*) !(* *)注释语句 %},S#5L3
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diagram shown: 1,2,3,4,5 !指定输出图表 9q,JqB
; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 0R^(rE"2#
; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 r`E1<aCr|
; 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{yNnJ3O
; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 0Eg r
Q
; 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 :~A1Ud4c
2.&V
include"Units.inc" !读取“Units.inc”文件中内容 WO*WAP)n
#]\G*>{
include"Tm-silicate.inc" !读取光谱数据 Ex s _LN
m"m;(T{ v
; Basic fiberparameters: !定义基本光纤参数 <!HDtN
L_f := 4 { fiberlength } !光纤长度 tIy/QN_42
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 m&z%kVsg]
r_co := 6 um { coreradius } !纤芯半径 Zz*mf+
N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 9kg>)ty@
,c %gwzU
; Parameters of thechannels: !定义光信道 0v)mgrl=,
l_p := 790 nm {pump wavelength } !泵浦光波长790nm FCB/FtI0
dir_p := forward {pump direction (forward or backward) } !前向泵浦 _TcQ12H 5<
P_pump_in := 5 {input pump power } !输入泵浦功率5W IEsD=
w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um P :h4
I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 Ly/~N/<\
loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 iU+,Jeu
_nFvM'`<
l_s := 1940 nm {signal wavelength } !信号光波长1940nm :<7>-+pa
w_s := 7 um !信号光的半径 sL`D}_:
I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 C%o/
loss_s := 0 !信号光寄生损耗为0 Ecl7=-y
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R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 3bL2fsn5
PaI63 !
; 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 TV>R(D3T/
calc oW1olmpp=
begin eS%6hUb
global allow all; !声明全局变量 (>lqp%G~
set_fiber(L_f, No_z_steps, ''); !光纤参数 ZTz(NS
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add_ring(r_co, N_Tm); ^p%+r B.j[
def_ionsystem(); !光谱数据函数 ,^[37/S
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 /%'7sx[p
signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 K>JU/(
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 ,ui'^8{gK
set_R(signal_fw, 1, R_oc); !设置反射率函数 MZMv.OeYt,
finish_fiber(); ?B:wV?-`
end; krY.Cc]
=` >Nfa+,
; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 bD[W~ku
show "Outputpowers:" !输出字符串Output powers: t4W0~7
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) |2` $g
show"signal: ",P_out(signal_fw):d3:"W" !输出字符串signal:和计算值(格式为3个有效数字,单位W) Z"nuO\zH~
1ucUnNkcV
JV{!Ukuyp+
; ------------- EGO@`<"h
diagram 1: !输出图表1 d#,V^
r<H^%##,w
"Powers vs.Position" !图表名称 %ycT}Lu
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x: 0, L_f !命令x: 定义x坐标范围 #yOY&W:N
"position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 fBh|:2u
y: 0, 15 !命令y: 定义y坐标范围 U.} =j'Us+
y2: 0, 100 !命令y2: 定义第二个y坐标范围 5fv6RQD
frame !frame改变坐标系的设置 WZ-{K"56
legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) A+*(Pds
hx !平行于x方向网格 bv" ({:x
hy !平行于y方向网格 .tZ$a_O
/P}tgcs
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 l),13"?C(
color = red, !图形颜色 hpKc_|un
width = 3, !width线条宽度 ~OfKn1D
"pump" !相应的文本字符串标签 _
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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 Q%d[U4@
color = blue, U .jMK{
width = 3, WuXRL}!\,
"fw signal" #Ih(2T
i
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 JH,bSb
color = blue, r/:'}os;
style = fdashed, Efd[ZJxS6
width = 3, 4tKf
"bw signal" E&v-(0
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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 W]]2Uo.
yscale = 2, !第二个y轴的缩放比例 @&>
+`kgU-
color = magenta, l'R`XGT
width = 3, nXW1 :
style = fdashed, i<![i5uAI
"n2 (%, right scale)" GY :IORuA4
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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 :fUmMta
yscale = 2, 6-}9m7# Y
color = red, t')I c6.?i
width = 3, B}T72!a
style = fdashed, mJqP#Unik
"n3 (%, right scale)" ^jC0S[csw2
qA[}\8}h
-v&srd^
; ------------- }k~0R-m
diagram 2: !输出图表2 3F3?be
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"Variation ofthe Pump Power" +fmZ&9hFNJ
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x: 0, 10 _"TG:RP
"pump inputpower (W)", @x 1yf&ck1R
y: 0, 10 r73Xh"SL
y2: 0, 100 \hX^Cn=6
frame fTcRqov
hx ]t<%>Z$
hy h@8
legpos 150, 150 ,+{ 43;a
Ha\ hQ'99
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 3M`J.>
step = 5, Y6Q6--P
color = blue, fA5#
2P{
width = 3, !<'R%<E3Q
"signal output power (W, leftscale)", !相应的文本字符串标签 BC+qeocg
finish set_P_in(pump, P_pump_in) IS~oyFS
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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 X?a67qL
yscale = 2, ?,[w6O*
step = 5, m-]"I8[
color = magenta, VI{1SIhfa
width = 3, P'';F}NwfX
"population of level 2 (%, rightscale)", 6ZJQ '9f
finish set_P_in(pump, P_pump_in) b1"wQM9
Nq8A vBwo4
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 HC$cK+,ZU}
yscale = 2, ;!b(b%
step = 5, R7>@-EG
color = red, J KGZ0yn
width = 3, ]a()siT
"population of level 3 (%, rightscale)", }W J`q`g
finish set_P_in(pump, P_pump_in) 7#`:m|$
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; ------------- 12E"6E)
diagram 3: !输出图表3 /:)4tIV
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"Variation ofthe Fiber Length" /e,lD)
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x: 0.1, 5 hB4.tMgZ
"fiber length(m)", @x s Y,3
y: 0, 10 H#:Yw|t
"opticalpowers (W)", @y %]` W sG
frame SE1 tlP
hx fr7/%{s
hy E7,\s
,b8AB_yw
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 'AoH2 |
step = 20, 6lGL.m'Ra
color = blue, gYZgo
width = 3, DX|kO
"signal output" hG U &C]
U7N<!6
;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 8MdKH7
step = 20, color = red, width = 3,"residual pump" ,o`qB81
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! set_L(L_f) {restore the original fiber length } >_".
0qv)'[O
5y)kQ<x"
; ------------- Us<lWEX;k
diagram 4: !输出图表4 uE2Yn`Ha
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