(* 'ZB^=T
Demo for program"RP Fiber Power": thulium-doped fiber laser, ,yA[XAz~U
pumped at 790 nm. Across-relaxation process allows for efficient [q Uv|l1
population of theupper laser level. fjOq@thD
*) !(* *)注释语句 R<U]"4CBx
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diagram shown: 1,2,3,4,5 !指定输出图表 >
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; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 nwh @F1|
; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 Qn,6s%n
; 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 15hqoo9!
; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 mf)+ 5On
; 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 1I{8 |
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include"Units.inc" !读取“Units.inc”文件中内容 VX&PkGi?o
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include"Tm-silicate.inc" !读取光谱数据 'It8h$^j
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; Basic fiberparameters: !定义基本光纤参数 U3N9O.VC
L_f := 4 { fiberlength } !光纤长度 w7o`BR
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 ,T`,OZm
r_co := 6 um { coreradius } !纤芯半径 #K6cBfqI
N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 P/dnH
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; Parameters of thechannels: !定义光信道 V*{rHp{=p
l_p := 790 nm {pump wavelength } !泵浦光波长790nm Yu>DgMW
dir_p := forward {pump direction (forward or backward) } !前向泵浦 hd u2?v@
P_pump_in := 5 {input pump power } !输入泵浦功率5W :Ys~Lt54
w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um kQ}n~Hn
I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 {X&lgj
loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 r]UF<*$
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l_s := 1940 nm {signal wavelength } !信号光波长1940nm +)iMJ]>
w_s := 7 um !信号光的半径 a9z#l}IQ
I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 ANy*'/f
loss_s := 0 !信号光寄生损耗为0 kB> ~Tb0
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R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 #F.jf2h@
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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 *B"Y]6$
calc M[gL7-%w\
begin -(8I ?{"4i
global allow all; !声明全局变量 R<Lf>p>_
set_fiber(L_f, No_z_steps, ''); !光纤参数 Z0jgUq`r
add_ring(r_co, N_Tm); /N"3kK,N
def_ionsystem(); !光谱数据函数 m|;(0
rft
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 (
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signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 "|L"C+tE
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 A913*O:\
set_R(signal_fw, 1, R_oc); !设置反射率函数 ^,acU\}VqP
finish_fiber(); AQlB_@ b
end; <4"-tYa
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; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 W(`QbNJ
show "Outputpowers:" !输出字符串Output powers: `t&{^ a&Y"
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) fI613ww]
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) t>I.1AS
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a
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; ------------- _`|1B$@x
diagram 1: !输出图表1 '7-Yo
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"Powers vs.Position" !图表名称 DK)W
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x: 0, L_f !命令x: 定义x坐标范围 MC}t8L=
"position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 ?m
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y: 0, 15 !命令y: 定义y坐标范围 '4[=*!hs!
y2: 0, 100 !命令y2: 定义第二个y坐标范围 l@4_D;b3o"
frame !frame改变坐标系的设置 Xv8-<Ks
legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) N1c=cZDV
hx !平行于x方向网格 B7C3r9wj
hy !平行于y方向网格 qd*}d)!
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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 +jGHR&A t
color = red, !图形颜色 *1b|j|5v
width = 3, !width线条宽度 wA=r]BT
"pump" !相应的文本字符串标签 nqcq3o*B
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 {LO Pm1K8Y
color = blue, \k.`xG?
width = 3, 7K1-.uQ
"fw signal" QJGGce
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 WQK<z!W5
color = blue, $KiCs]I+
style = fdashed, $YL9 vJV
width = 3, ~~tTr$
"bw signal" Ts5)r(
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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 6#?T?!vZ
yscale = 2, !第二个y轴的缩放比例 8M,*w6P
color = magenta, rs&]46i/p
width = 3, Z!1D4`w
style = fdashed, |*&l?S
"n2 (%, right scale)" XO <wK
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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 m&UP@hUV-
yscale = 2, uJ!&T
color = red, B$4*U"tk
width = 3, HN5m %R&`
style = fdashed, Kg[OUBv
"n3 (%, right scale)" mmAm@/
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; ------------- c/;;zc
diagram 2: !输出图表2 ~MC|
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"Variation ofthe Pump Power" )dXa:h0RZ
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x: 0, 10 iNO>'7s7
"pump inputpower (W)", @x +)Z]<O
y: 0, 10 D*XrK0#Z`
y2: 0, 100 f98,2I(>`+
frame {f/qI`
hx p@m0Oi,=
hy 9BCW2@Kp
legpos 150, 150 XH%L]
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f: (set_P_in(pump, x);P_out(signal_fw)), !set_P_in(pump,x)改变泵浦信道功率;P_out(signal_fw)输出前向信号光 067c/c
step = 5, l& :EKh
color = blue, sZ.<:mu[
width = 3, yk+ 50/L
"signal output power (W, leftscale)", !相应的文本字符串标签 b/SBQ"B%
finish set_P_in(pump, P_pump_in) I= mz^c{
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f: (set_P_in(pump,x); 100 * n_av(2)), !改变泵浦信号功率对能级2上激活粒子占比的影响 0Y.z
yscale = 2, ]-=L7a
step = 5, L.Y3/H_
color = magenta, KII{GDR]
width = 3, 6#=jF[
"population of level 2 (%, rightscale)", VF%QM;I[Rc
finish set_P_in(pump, P_pump_in) A~zn;
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f: (set_P_in(pump,x); 100 * n_av(3)), !改变泵浦信号功率对能级3上激活粒子占比的影响 ke4E1T-1n
yscale = 2, Y-VDi.]W
step = 5, x.Sf B[SZ
color = red, y7Po$ )8l
width = 3, L4By5)
"population of level 3 (%, rightscale)", oV|O`n
finish set_P_in(pump, P_pump_in) iHa?b2=)
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; ------------- &5CRXf
diagram 3: !输出图表3 'o AmA=
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"Variation ofthe Fiber Length" t^s&1#iC
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x: 0.1, 5 dkQ4D2W*\
"fiber length(m)", @x <r%K i`u(p
y: 0, 10 j3j?2#vR
"opticalpowers (W)", @y j\2Qe%d
frame YIQD9
hx ]#tB[G
hy r`H}f#.KR
"<,lqIqA;
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 +8Xjk\Hi
step = 20, HJL! ;i
color = blue, Q$%apL
width = 3, L%'J]HL-
"signal output" %iyc1]w{
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;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 uP~,]ci7
step = 20, color = red, width = 3,"residual pump" /{T&l*'
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! set_L(L_f) {restore the original fiber length } \PrJy6&
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