(* 7XTkX"zKj
Demo for program"RP Fiber Power": thulium-doped fiber laser, |y!=J$$_H
pumped at 790 nm. Across-relaxation process allows for efficient w[zjerH3
population of theupper laser level. diL+:H
*) !(* *)注释语句 59Xi3KY
bnq;)>&
diagram shown: 1,2,3,4,5 !指定输出图表 1PQ~jfGi
; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 a!7A_q8M
; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 )_syZ1j
; 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 aeFe!`F
; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 A+ZK4]xb
; 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 fTS5yb%
f33 2J
include"Units.inc" !读取“Units.inc”文件中内容 |:q=T
~x
:dl]h&C^
include"Tm-silicate.inc" !读取光谱数据 GP!?^r:en
Fq~yL!#!
; Basic fiberparameters: !定义基本光纤参数 sJ;g$TB
L_f := 4 { fiberlength } !光纤长度 NO "xL,
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 :~e>Ob[,"
r_co := 6 um { coreradius } !纤芯半径 W>Y@^U&x`
N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 VRWAm>u
=9y[1t
; Parameters of thechannels: !定义光信道 /32Fy`KV
l_p := 790 nm {pump wavelength } !泵浦光波长790nm #^lL5=
dir_p := forward {pump direction (forward or backward) } !前向泵浦 #%a;"w
P_pump_in := 5 {input pump power } !输入泵浦功率5W ]i&6c
w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um twL3\
}N/B
I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 fxgPhnaC>
loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 ]fx"4qKM
f2Klt6"9
l_s := 1940 nm {signal wavelength } !信号光波长1940nm ZXqSH${Tp
w_s := 7 um !信号光的半径 <r.)hT"0
I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 lP[w?O
loss_s := 0 !信号光寄生损耗为0 @TLS<~
+X#vVD3"
R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 7`-Zuf
fM]+SMZy
; 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 ''q@>
calc CY
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begin ^1S!F-H4\
global allow all; !声明全局变量 $:=A'd2
set_fiber(L_f, No_z_steps, ''); !光纤参数 _Zp}?b5Q
add_ring(r_co, N_Tm); 9=vMgW
def_ionsystem(); !光谱数据函数 nno}e/zqf
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 &vo--V1|
signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 ~ZmN44?R
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 -E^vLB)O
set_R(signal_fw, 1, R_oc); !设置反射率函数 14Xqn8uOW
finish_fiber(); Lz`E;k^
end; @)UZ@ ~R
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; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 O!mvJD
show "Outputpowers:" !输出字符串Output powers: j2Cks_$:
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) >QjAoDVX?
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) 8UW^"4
3VsW@SG7N
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; ------------- NO~*T?&
diagram 1: !输出图表1 q4R5<LW"
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"Powers vs.Position" !图表名称 B( ]M&
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x: 0, L_f !命令x: 定义x坐标范围 %b%-Ogz;4
"position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 N^#ZJoR
y: 0, 15 !命令y: 定义y坐标范围 X>d"]GD
y2: 0, 100 !命令y2: 定义第二个y坐标范围 $:cE ^8K
frame !frame改变坐标系的设置 aUzBV\Yd}
legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) "8c@sHk(w
hx !平行于x方向网格 J5di[nu
hy !平行于y方向网格 k&&2Tq
M=%l}FSTw(
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 qS403+Su1=
color = red, !图形颜色 Ozw;(fDaU
width = 3, !width线条宽度 NMW#AZVd
"pump" !相应的文本字符串标签 ;Yx )tWQI
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 z8jk[5z
color = blue, 1QqYQafA
width = 3, ZRv*!n(Ug<
"fw signal" TMAJb+@l:
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 P<PJ)>
color = blue, E4gYemuN
style = fdashed, -u&6X,Oq\u
width = 3, :}yi-/_8!
"bw signal" @.osJ}FxA
$"`- ^
f: 100 * n(x, 2), !n(x ,2) 函数是计算x位置处激活粒子数在能级2上的占比 8MK>)P o)
yscale = 2, !第二个y轴的缩放比例 iDN;m`a
color = magenta, 3t`P@nL0;
width = 3, ZtV9&rd7
style = fdashed, G3{Q"^S"
"n2 (%, right scale)" &Flglj~7l
j;%-fvd;
f: 100 * n(x, 3), !n(x ,3) 函数是计算x位置处激活粒子数在能级3上的占比 4FEk5D
yscale = 2, ]p*l%(dhY
color = red, uG?_< mun
width = 3, #%`|~%`{:
style = fdashed, So{x]x:f
"n3 (%, right scale)" [r3 !\HI7x
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; -------------
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diagram 2: !输出图表2 d1T,eJ}
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"Variation ofthe Pump Power" ykv94i?Q
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x.I
x: 0, 10 0="%Y^N
"pump inputpower (W)", @x -0?~
y: 0, 10 =3|O%\
y2: 0, 100 wyp|qIS;
frame h lkn%
hx ^9^WuSq
hy aT_&x@x
legpos 150, 150 xG}(5Tt
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f: (set_P_in(pump, x);P_out(signal_fw)), !set_P_in(pump,x)改变泵浦信道功率;P_out(signal_fw)输出前向信号光 e&7JpT
step = 5, pF&(7u
color = blue, g$HwxA9Gp/
width = 3, }~#pEX~j*
"signal output power (W, leftscale)", !相应的文本字符串标签 VGtC)mG8)
finish set_P_in(pump, P_pump_in) $P>`m$(8
/3;4#:Kkw
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 W.z;B<
yscale = 2, sW)Zi
step = 5, *_R]*o!W'
color = magenta, $tz;<M7B
width = 3, k:JrHBKv\
"population of level 2 (%, rightscale)", @.G[s)x
finish set_P_in(pump, P_pump_in) n9@ of
fNb`X
f: (set_P_in(pump,x); 100 * n_av(3)), !改变泵浦信号功率对能级3上激活粒子占比的影响 _$=
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yscale = 2, G:<`moKgL
step = 5, ktj]:rCkF
color = red, /TZOJE(2j
width = 3, +
` s@
"population of level 3 (%, rightscale)", #k_HN}B
finish set_P_in(pump, P_pump_in) GKvN*
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)N=NR2xBZ
; ------------- Jj,U RD&0R
diagram 3: !输出图表3 AFc$%\s4
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"Variation ofthe Fiber Length" '3TW [!m
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x: 0.1, 5 NG
"fiber length(m)", @x ~n[xtWO0
y: 0, 10 ]Tkc-ez
"opticalpowers (W)", @y j'%$XvI
frame /I)yU>o
hx c7tfRq
n+
hy (S xR`QP?,
v-yde>(
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 bx]N>k J
step = 20, uHAT#\m:
color = blue, c6nflk.l
width = 3, ?CC"Yij
"signal output" yHHt(GM|o
0{dz5gUde
;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 A81ls#is
step = 20, color = red, width = 3,"residual pump" 2zVJ vn7
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! set_L(L_f) {restore the original fiber length } 7<%<Ff@^)O
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; ------------- Q3|T':l4
diagram 4: !输出图表4 w3=%*<
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"TransverseProfiles" uL3Eq>~x
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I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) KN tt
taFn, !掺杂浓度的径向分布 ?Y:8eD"*
yscale = 2, )(tM/r4`c&
color = gray, )$`wIp
width = 3, G7)Fk%>
maxconnect = 1, ]S(%[|
"N_dop (right scale)" srYJp^sC
Nnk@h
f: I(pump, -1, x *um, 0) * cm^2, !泵浦光沿光纤径向的强度分布 Qt,M!i,
color = red, oyNSh8c7c
maxconnect = 1, !限制图形区域高度,修正为100%的高度 -s|}Rh?Y
width = 3, T"&)&"W*U
"pump" Q>R>R*1.j
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f: I(signal_fw, -1,x * um, 0) * cm^2, !信号光沿光纤径向的强度分布 1fo
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color = blue, #7ov#_2Jd
maxconnect = 1, c\ia6[3sX
width = 3, c-g)eV|)S
"signal" /;tPNp{!dw
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; ------------- =xsTDjH>
diagram 5: !输出图表5 &q`q4g&7
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"TransitionCross-sections" _[Vf547vS
H)aQ3T4N5
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) u5~Ns&o&N
8E8N6
x: 1450, 2050 DhX#E&
"wavelength(nm)", @x "wlt> SU
y: 0, 0.6 jS;J:$>^
"cross-sections(1e-24 m²)", @y =
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frame +3a?`Z
hx 3SSm5{197
hy MwfOy@|N
4J?t_)
f: s12_Tm(x * nm) /1e-24, !Tm3+吸收截面与波长的关系 ^/5XZ} *
color = red, FSRm|
width = 3, D;I6Q1I
"absorption" "+zCS|
f: s21_Tm(x * nm) /1e-24, !Tm3+发射截面与波长的关系 4QIE8f
Y
color = blue, *=fr8
width = 3, >XOiu#kC
"emission" s;1]tD
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