(* hFa\x5I5
Demo for program"RP Fiber Power": thulium-doped fiber laser, %8
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pumped at 790 nm. Across-relaxation process allows for efficient _F^|n}Qbj
population of theupper laser level. Q+ G=f
*) !(* *)注释语句 3SQ
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diagram shown: 1,2,3,4,5 !指定输出图表 @oYq.baHX
; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 X?rJO~5
; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 f{ S)wE>;
; 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 v}[KVwse
; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 ,`+y4Z6`W2
; 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 (U/[i.r5Cj
;
@Gm@d
include"Units.inc" !读取“Units.inc”文件中内容 ,O
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include"Tm-silicate.inc" !读取光谱数据 @zfeCxVOA
Mw'd<{
; Basic fiberparameters: !定义基本光纤参数 )IZ$R*Y{
L_f := 4 { fiberlength } !光纤长度 O";r\Z
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 =NJb9S&8A
r_co := 6 um { coreradius } !纤芯半径 $
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N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 C<w9f
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; Parameters of thechannels: !定义光信道 aKCCFHq t!
l_p := 790 nm {pump wavelength } !泵浦光波长790nm w #(XiH*
dir_p := forward {pump direction (forward or backward) } !前向泵浦 !h9 An
P_pump_in := 5 {input pump power } !输入泵浦功率5W f.+e
w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um N@)4H2_u \
I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 eMz,DYa/G
loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 9zO;sg;3
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l_s := 1940 nm {signal wavelength } !信号光波长1940nm
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w_s := 7 um !信号光的半径 P!bm$h*3?
I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 (:T~*7/"
loss_s := 0 !信号光寄生损耗为0 ]]%C\Ryy}
, PN?_N
R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 mg >oB/,'Z
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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 l@#X]3h!
calc SKRD{MRsux
begin @Gn9x(?J
global allow all; !声明全局变量 }
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set_fiber(L_f, No_z_steps, ''); !光纤参数 {8I93]
add_ring(r_co, N_Tm); G2L7_?/m
def_ionsystem(); !光谱数据函数 hDp'=}85@
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 _5y)m5I
signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 Ii|<:BW
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 5@ZD'
set_R(signal_fw, 1, R_oc); !设置反射率函数 7^Onq0ym T
finish_fiber(); $g|g}>Sc
end; /h2`?~k+
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; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 )SDGj;j+
show "Outputpowers:" !输出字符串Output powers: )XO2DY1/&
show"pump: ", P_out(pump):d3:"W" !输出字符串pump:和计算值(格式为3个有效数字,单位W) R~Xl(O
show"signal: ",P_out(signal_fw):d3:"W" !输出字符串signal:和计算值(格式为3个有效数字,单位W) ?+Qbr$]
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; ------------- o~GhV4vq
diagram 1: !输出图表1 5gJQr%pS
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"Powers vs.Position" !图表名称 o)-Qd3d%S
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x: 0, L_f !命令x: 定义x坐标范围 :EA,0 ,
"position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 $~ItT1k_
y: 0, 15 !命令y: 定义y坐标范围 _r,# l5~U
y2: 0, 100 !命令y2: 定义第二个y坐标范围 'Z&A5\~
frame !frame改变坐标系的设置 )0d3sJ8
legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) ! B)Em
hx !平行于x方向网格 n!tC z<v
hy !平行于y方向网格 H9jj**W ;$
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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 has5"Bb
color = red, !图形颜色 MCYrsgg}
width = 3, !width线条宽度 $fh?(J
"pump" !相应的文本字符串标签 o}%
f: P(signal_fw, x), !P(signal_fw ,x) 函数是计算x位置处的前向信号光功率 C2`END;
color = blue, 7CQ48LH]
width = 3, TUk1h\.q
"fw signal" l{y~N
f: P(signal_bw, x), !P(signal_bw ,x) 函数是计算x位置处的后向信号光功率 zxsnrn;|
color = blue, f'%}{l: ss
style = fdashed, 7z+NR&'M$
width = 3, $!fz87-p>
"bw signal" e| kYu[^
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f: 100 * n(x, 2), !n(x ,2) 函数是计算x位置处激活粒子数在能级2上的占比 WnIh (
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yscale = 2, !第二个y轴的缩放比例 DsFrA]
color = magenta, cxmr|-^
width = 3, ke/o11LP
style = fdashed, !A<?nz
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"n2 (%, right scale)" (nV/-#*
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f: 100 * n(x, 3), !n(x ,3) 函数是计算x位置处激活粒子数在能级3上的占比 4z$eT
yscale = 2, (oTx*GP>Y
color = red, E&"bgwav{(
width = 3, i@g6%V=
style = fdashed, cPtP?)38.
"n3 (%, right scale)" (sPZ1Fr\o
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; ------------- WS,p}:yPZG
diagram 2: !输出图表2 G-;pMFP(?
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"Variation ofthe Pump Power" n7Re@'N<
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x: 0, 10 g/T`4"p[H
"pump inputpower (W)", @x o!j? )0d
y: 0, 10 $aVcWz%
y2: 0, 100 rgOB0[
frame ^LnCxA&QH
hx Wk$%0xZ7
hy &{7%VsTB
legpos 150, 150 y|1-,u.$
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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 Lo !kv*
step = 5, -lLq)
color = blue, h],_1!0
width = 3, aA\v
"signal output power (W, leftscale)", !相应的文本字符串标签 O*c+TiTb
finish set_P_in(pump, P_pump_in) >pn?~
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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 B?Pu0
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yscale = 2, 0]5QX/I
step = 5, H'2pmwk
color = magenta, *78TT\q<
width = 3, "|&SC0*
"population of level 2 (%, rightscale)", m}8c.OJ>K`
finish set_P_in(pump, P_pump_in) /pV^w
gl HHr
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 0naegy?,
yscale = 2, C~kw{g+|
step = 5, Pc1vf]
color = red, ,Y}HP3
width = 3, G;`+MgJ)
"population of level 3 (%, rightscale)", ^gD&Nb