(* MXs]3M
Demo for program"RP Fiber Power": thulium-doped fiber laser, K?6#jT6#
pumped at 790 nm. Across-relaxation process allows for efficient .9!?vz]1
population of theupper laser level. h 6juX'V
*) !(* *)注释语句 )KKmV6>b
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diagram shown: 1,2,3,4,5 !指定输出图表 {Z1^/Fv3
; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 }TG=ZVi
; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 'a=' (,%
; 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 ]dL#k>$0q
; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 ]]50c
; 5:"Transition Cross-sections" !不同波长的跃迁横截面,横坐标波长,纵坐标为横截面 *eAzk2
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include"Units.inc" !读取“Units.inc”文件中内容 \s_`ZEB
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include"Tm-silicate.inc" !读取光谱数据 6$
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; Basic fiberparameters: !定义基本光纤参数 jbTsrj"g
L_f := 4 { fiberlength } !光纤长度 +J7xAyv_Oz
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 &5Huv?^a'
r_co := 6 um { coreradius } !纤芯半径 ,rWej;CzN
N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 v|wO qS
cc:,,T/i
; Parameters of thechannels: !定义光信道 TSUT3'&~p
l_p := 790 nm {pump wavelength } !泵浦光波长790nm Z?)=4|
dir_p := forward {pump direction (forward or backward) } !前向泵浦 =4804N7
P_pump_in := 5 {input pump power } !输入泵浦功率5W c63yJqiW
w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um R_B`dP<"~Y
I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 /yFs$t>9
loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 -P-&]F5
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l_s := 1940 nm {signal wavelength } !信号光波长1940nm \pVWYx
w_s := 7 um !信号光的半径 ,L$,d
I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 CQ:38l\`gd
loss_s := 0 !信号光寄生损耗为0 b>f{o_
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R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 s'=w/os
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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 e<r}{=1w
calc ;}4^WzmK^(
begin o>o! -uf
global allow all; !声明全局变量 3pjK`"Nmz\
set_fiber(L_f, No_z_steps, ''); !光纤参数 y28 e=i
add_ring(r_co, N_Tm); VTJxVYE
def_ionsystem(); !光谱数据函数 yR[htD`
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 =k:yBswi
signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 YOQ>A*@4
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 `R,g_{Mj
set_R(signal_fw, 1, R_oc); !设置反射率函数 WO{ET
finish_fiber(); :bu]gj4e
end; zaG1
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; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 Ms14]M[\
show "Outputpowers:" !输出字符串Output powers: rVv4R/3+
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) WFG`-8_e[I
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) KYR64[1
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D
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; ------------- 9;R'Xo=y
diagram 1: !输出图表1 G1G*TSf
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"Powers vs.Position" !图表名称 u:M)JG
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x: 0, L_f !命令x: 定义x坐标范围 Zk>#T:{h
"position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 CZw]@2/JuQ
y: 0, 15 !命令y: 定义y坐标范围 aM|;3j1p
y2: 0, 100 !命令y2: 定义第二个y坐标范围 yhh\?qqy
frame !frame改变坐标系的设置 n>W*y|UJ
legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) 0{qe1pb w
hx !平行于x方向网格 IM=3n%6
hy !平行于y方向网格 f]48>LRE8
]? %*3I
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 =H;F{J"
color = red, !图形颜色 % 9} ?*U
width = 3, !width线条宽度 _p;=]#+c&
"pump" !相应的文本字符串标签 D] +]Br8
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 FgnPh%[u
color = blue, )<[)7`
width = 3, Mq52B_
"fw signal" &*#Obv
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 +{L=cWA"
color = blue, 'J_`CS
style = fdashed, 7~!F3WT{
width = 3, #D-Ttla
"bw signal" u#nM_UJe
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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 ;}}k*<
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yscale = 2, !第二个y轴的缩放比例 >G}g=zy@
color = magenta, 85qD~o?O
width = 3, C9^C4
style = fdashed, i)=
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"n2 (%, right scale)" v\dP
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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 /@Ec[4^=!.
yscale = 2, Cq[<CPAS
color = red, s2"<<P[q'
width = 3, 8c%_R23
style = fdashed, 5+[ 3@
"n3 (%, right scale)" d-`z1'
dU&hM<.|
\S0QZQbz/
; ------------- xjh(;S'
diagram 2: !输出图表2 Kp>fOe'KW
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"Variation ofthe Pump Power" J~|:Q.Rt`
_~bG[lX !
x: 0, 10 w5;d/r<q
"pump inputpower (W)", @x W~j>&PK,?
y: 0, 10 YK>?;U+|
y2: 0, 100 Y3O/`-9i
frame _K3;$2d|R
hx sFw;P`
hy yq12"Rs
legpos 150, 150 (?1/\r
5#~E[dr
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 eI1C0Uz1
step = 5, ]JHInt
color = blue, 4}NCdGD
width = 3, ;s?,QvE{r#
"signal output power (W, leftscale)", !相应的文本字符串标签 $S/EIN c
finish set_P_in(pump, P_pump_in) RMlx[nsq
.* &F
f: (set_P_in(pump,x); 100 * n_av(2)), !改变泵浦信号功率对能级2上激活粒子占比的影响 X3m)
yscale = 2, Y'yGhpT~
step = 5, @T%8EiV
color = magenta, /_r` A
width = 3, Bdm05}c@u
"population of level 2 (%, rightscale)", ]h'*L`
finish set_P_in(pump, P_pump_in) X*t2h3"}
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f: (set_P_in(pump,x); 100 * n_av(3)), !改变泵浦信号功率对能级3上激活粒子占比的影响 lBLL45%BIN
yscale = 2, up2wkc8
step = 5, UN|S!&C$
color = red, F#a'N c9
width = 3, c~u91h?
"population of level 3 (%, rightscale)", dg#w!etB
finish set_P_in(pump, P_pump_in) 6|QIzs<Z-X
t:YMF$Z
?%*p!m
; ------------- X'p%K/-m
diagram 3: !输出图表3 lJt?0;gn
yM*_"z!L
"Variation ofthe Fiber Length" *BKIA
(Q"~bP{F
x: 0.1, 5 bzh:
"fiber length(m)", @x l:*.0Tj
y: 0, 10 Mp06A.j[
"opticalpowers (W)", @y 2E0oLl[
frame uOPLJ?%
hx uQg&