(* qAW?\*n5N
Demo for program"RP Fiber Power": thulium-doped fiber laser, )>;V72
pumped at 790 nm. Across-relaxation process allows for efficient A-f,&TO
population of theupper laser level. i`^[_
*) !(* *)注释语句 e#odr{2#4u
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diagram shown: 1,2,3,4,5 !指定输出图表 0s!';g Q
; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 s8.SEk|pB
; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 pD17r}%
; 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 Xe2Zf
; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 wl /1~!
; 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 Yfr4<;%
I7XJPc4}
include"Units.inc" !读取“Units.inc”文件中内容 L%HFsuIO-
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include"Tm-silicate.inc" !读取光谱数据 '!<gPAVTzV
;<l#k7 /
; Basic fiberparameters: !定义基本光纤参数 IXv9mr?H}
L_f := 4 { fiberlength } !光纤长度 Q.,2G7[ <
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 2rxz<ck(
r_co := 6 um { coreradius } !纤芯半径 txik{' :
N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 l i)
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\b*z<Odv
; Parameters of thechannels: !定义光信道 (vFO'jtcB-
l_p := 790 nm {pump wavelength } !泵浦光波长790nm v>/_U
dir_p := forward {pump direction (forward or backward) } !前向泵浦 X/ lmj_v
P_pump_in := 5 {input pump power } !输入泵浦功率5W Ay0.D FL
w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um G^Va$ike
I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 T^icoX=c4
loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 dJ{q}U
,lcSJ^yr
l_s := 1940 nm {signal wavelength } !信号光波长1940nm UDW_?SHAx
w_s := 7 um !信号光的半径 \}71pzw(
I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 B \LmE+a>
loss_s := 0 !信号光寄生损耗为0 l[<U UEjZJ
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R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 G%ZP`
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; Function for defining themodel: !定义模型函数,一定要有calc命令,否则函数只会被定义,但不会被执行 H[RX~Xk2E
calc yoH,4,! G
begin K\FLA_J
global allow all; !声明全局变量 _FxeZ4\
set_fiber(L_f, No_z_steps, ''); !光纤参数 &y&HxV
add_ring(r_co, N_Tm); m*.+9 6
def_ionsystem(); !光谱数据函数 :$*@S=8 O
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 ^yX >^1
signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 "hk {"0E
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 JwQ/A[b
set_R(signal_fw, 1, R_oc); !设置反射率函数 1Qw_P('}
finish_fiber(); &z#`Qa3NI
end; SBI*[
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; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 yy Y\g
show "Outputpowers:" !输出字符串Output powers: ]$=#:uf
show"pump: ", P_out(pump):d3:"W" !输出字符串pump:和计算值(格式为3个有效数字,单位W) k [LV^oEg
show"signal: ",P_out(signal_fw):d3:"W" !输出字符串signal:和计算值(格式为3个有效数字,单位W) 8S7#tb@3
1obajN
d(yTz&u)
; ------------- GvZ[3GT
diagram 1: !输出图表1 Zo,066'+[.
c:[ZknnCe
"Powers vs.Position" !图表名称 &->ngzg
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x: 0, L_f !命令x: 定义x坐标范围 1|m%xX,[
"position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 JT&RaFX
y: 0, 15 !命令y: 定义y坐标范围 L5'?.9]
y2: 0, 100 !命令y2: 定义第二个y坐标范围 O?O=]s
u
frame !frame改变坐标系的设置 4fL`.n1^
legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) v-BQ>-& s
hx !平行于x方向网格 bObsj]
hy !平行于y方向网格 >g m
G\o9mEzQ
f: P(pump, x), !命令f: 定义函数图;P(pump, x)函数是计算x位置处的泵浦光功率 TbaZFLr
color = red, !图形颜色 d8iq9AP\o
width = 3, !width线条宽度 53 -Owjpx
"pump" !相应的文本字符串标签 :a^/&LbLm
f: P(signal_fw, x), !P(signal_fw ,x) 函数是计算x位置处的前向信号光功率 &isKU8n
color = blue, P)cEYk
width = 3, u HW'F(;
"fw signal" [N12X7O3
f: P(signal_bw, x), !P(signal_bw ,x) 函数是计算x位置处的后向信号光功率 :yRv:`r3Lt
color = blue, oKCv$>Y
style = fdashed, #IJeq0TVB
width = 3, A $ ]s{`
"bw signal" 91]sO%3
+H28 F_#
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 XDHi4i47`o
yscale = 2, !第二个y轴的缩放比例 )_1 GPS
color = magenta, j8nkNE]&
width = 3, LM+d3|gSV
style = fdashed, P8Wv&5A
"n2 (%, right scale)" [Ky3WppR
~d].<Be
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 ]jYFrOMy4S
yscale = 2, R1D ;
color = red, N/ f7"~+`
width = 3, {VKFw=$8
style = fdashed, PfZS"yk
"n3 (%, right scale)" {0j_.XZ
Nke!!A}\|
o+B)
; ------------- bK.*v4RG
diagram 2: !输出图表2 fvcS=nRQv
7}g4ePYag
"Variation ofthe Pump Power" 6JDaZh"=K
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x: 0, 10
g`%in
"pump inputpower (W)", @x eZaSV>27
y: 0, 10 tc<uS%XT4^
y2: 0, 100 AYgXqmH~+
frame #c5jCy}n
hx R(`:~@3\6
hy ^lAM /
legpos 150, 150 }f]Y^>-Ux
OQ7 `n<I<)
f: (set_P_in(pump, x);P_out(signal_fw)), !set_P_in(pump,x)改变泵浦信道功率;P_out(signal_fw)输出前向信号光 YZj*F-}
step = 5, BHf$ %?3z,
color = blue, h693TS_N
width = 3, 7jgj;%
"signal output power (W, leftscale)", !相应的文本字符串标签 IHYLM;@L
finish set_P_in(pump, P_pump_in) 6,aH[>W
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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 ;4[[T%&v
yscale = 2, Dlq!:dF{&
step = 5, mL=d EQ
color = magenta, %VH, (}i
width = 3, REU,"
"population of level 2 (%, rightscale)", ~/]]H;;^u
finish set_P_in(pump, P_pump_in) o`,~#P|
lQ-<T<g
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 =9X1 +x
yscale = 2, lI 4tW=
step = 5, 8HQ.MXKP
color = red, d51'[?(
width = 3,
&cSVOsi
"population of level 3 (%, rightscale)", L%T(H<