(* kI04<!
Demo for program"RP Fiber Power": thulium-doped fiber laser, E_$nsM8?
pumped at 790 nm. Across-relaxation process allows for efficient q&3(yhx
population of theupper laser level. W5Jy"]^I
*) !(* *)注释语句 zsd<0^
p\{
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diagram shown: 1,2,3,4,5 !指定输出图表 6{udNv X
; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 m5]
a
; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 _,v?rFLE
; 3:"Variation of the Fiber Length"!信号输出功率vs 光纤长度的变化,仿真最佳光纤长度 nO'C2)bBSG
; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 -qvMMit%7
; 5:"Transition Cross-sections" !不同波长的跃迁横截面,横坐标波长,纵坐标为横截面 ~*\ *8U@7
u+z
include"Units.inc" !读取“Units.inc”文件中内容 hyJ&~i0P{J
(RrC<5"
include"Tm-silicate.inc" !读取光谱数据 K0o${%'@7
m+7%]$
; Basic fiberparameters: !定义基本光纤参数 )+Z.J]$O-
L_f := 4 { fiberlength } !光纤长度 @c"s6h&
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 ME!P{ _/
r_co := 6 um { coreradius } !纤芯半径 FYu30
N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 DnhbMxh8o
E@)'Z6r1
; Parameters of thechannels: !定义光信道 #PPHxh*S
l_p := 790 nm {pump wavelength } !泵浦光波长790nm ZQir?1=
dir_p := forward {pump direction (forward or backward) } !前向泵浦 'r_Fi5[q
P_pump_in := 5 {input pump power } !输入泵浦功率5W 0t"Iq71/
w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um B]b/(Q+
I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 qe?Ns+j<d
loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 @q>#]8
%qE"A6j
l_s := 1940 nm {signal wavelength } !信号光波长1940nm hMvJNI6O
w_s := 7 um !信号光的半径 Ma(Q~G
.
I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 ?dv-`)S&
loss_s := 0 !信号光寄生损耗为0 bUM4^m
|/ 8!PKm
R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 Q3$DX,8?
J{kS4v*J
; 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 PA*k|
calc cUd>ahv
begin 2u5\tp?8
global allow all; !声明全局变量 pV\ >?
set_fiber(L_f, No_z_steps, ''); !光纤参数 n)D
add_ring(r_co, N_Tm); rK}sQ4z=
def_ionsystem(); !光谱数据函数 aR@+Qf
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 \Nf[8n#{
signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 0"TPY(n
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 z%JN| 5
set_R(signal_fw, 1, R_oc); !设置反射率函数 9AQ,@xP|
finish_fiber(); L*|P'
end; zLg$|@E&
*<[\|L:#]Z
; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 TXV^f*
show "Outputpowers:" !输出字符串Output powers: Ku uiU=
(L
show"pump: ", P_out(pump):d3:"W" !输出字符串pump:和计算值(格式为3个有效数字,单位W) R- ,L"Vv
show"signal: ",P_out(signal_fw):d3:"W" !输出字符串signal:和计算值(格式为3个有效数字,单位W) 7)2Q
*>Bew
XN?my@_HpM
; ------------- tu{paQ
diagram 1: !输出图表1 ;.=0""-IF
c(b`eUOO
"Powers vs.Position" !图表名称 6CGk*s
aZa1 eE
x: 0, L_f !命令x: 定义x坐标范围 '"LaaTTs
"position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 g`.H)36
y: 0, 15 !命令y: 定义y坐标范围 s[/d}S@ >
y2: 0, 100 !命令y2: 定义第二个y坐标范围 4f~q$Sf]<
frame !frame改变坐标系的设置 H,GnF
legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) &t_TLV 8T
hx !平行于x方向网格 MY z!zI
hy !平行于y方向网格 ;Oq>c=9%
3A~<|<}t
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 55] MRv
color = red, !图形颜色 'gD./|Z0
width = 3, !width线条宽度 ,VUOsNN4\
"pump" !相应的文本字符串标签 jeA2yjAC
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 pX!T; Re;
color = blue, /n$R-Q
width = 3, 0@EI@X;q
"fw signal" 2\|sXC
f: P(signal_bw, x), !P(signal_bw ,x) 函数是计算x位置处的后向信号光功率 d$E>bo-\
color = blue, T?jN/}qg
style = fdashed, /M3;~sx
width = 3, -!M>;M@
"bw signal" r9b(d]
9U3 }_
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 Uqj$itqUQ
yscale = 2, !第二个y轴的缩放比例 4 R8Qn^
color = magenta, v/$<#2|
width = 3, Ytqx0
style = fdashed,
M\JAB ;A
"n2 (%, right scale)" jJ2{g> P0P
,qV 7$u
f: 100 * n(x, 3), !n(x ,3) 函数是计算x位置处激活粒子数在能级3上的占比 fT?m~W^
yscale = 2, >lek@euqw
color = red, _ogN
width = 3, asy:[r"
style = fdashed, @ IDY7x27
"n3 (%, right scale)" ~%
`hh9]
/Zx"BSu
B !rb*"[
; ------------- V}Q`dEk2r
diagram 2: !输出图表2 8)Vl2z
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"Variation ofthe Pump Power" B7[#z{8'#
gdyWuOxa|
x: 0, 10 Y[rCF=ZVH
"pump inputpower (W)", @x ={6vShG)m
y: 0, 10 rF{,]U9`
y2: 0, 100 [{vX*q
3B
frame .;,,{;
hx sdd%u~4,X
hy `m"K_\w=/
legpos 150, 150 }#=t%uZ/
:qShP3 ^
f: (set_P_in(pump, x);P_out(signal_fw)), !set_P_in(pump,x)改变泵浦信道功率;P_out(signal_fw)输出前向信号光 ExL7 ]3r
step = 5, dEX67rUj;
color = blue, mOyNl
-f
width = 3, pMAFZfte!x
"signal output power (W, leftscale)", !相应的文本字符串标签 ]a*26AbU+
finish set_P_in(pump, P_pump_in) fNyXDCl
+OSSgY$
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 pk;S"cnk
yscale = 2, jsKKg^g
step = 5, *8u<?~9F
color = magenta, 6vU%Y_n=y]
width = 3, N!\1O,
"population of level 2 (%, rightscale)", u2I@ fH/
finish set_P_in(pump, P_pump_in) ?fc<3q"
HuN_$aP
f: (set_P_in(pump,x); 100 * n_av(3)), !改变泵浦信号功率对能级3上激活粒子占比的影响 2J3y
1
yscale = 2, tpgD{BY^wJ
step = 5, <p`
F/p-
color = red, Z`%^?My
width = 3, C8(0|XX
"population of level 3 (%, rightscale)", ys7Tq+
finish set_P_in(pump, P_pump_in) NKVLd_f k
c2Y\bKeN
ybIqn0&[
; ------------- #??[;xjs!
diagram 3: !输出图表3 =#{q#COK$
/}eb1o
"Variation ofthe Fiber Length" $o)}@TC
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I#C
x: 0.1, 5 usi3z9P>n
"fiber length(m)", @x LW!4KA]
y: 0, 10 WK{F
"opticalpowers (W)", @y $g,v]MW
frame srKEtd"
hx VY=YI}E
hy UMPW<>z
tq*6]q8c>
f: (set_L(x);P_out(signal_fw)), !改变光纤长度对信号光输出功率的影响 9R[PpE''
step = 20, 6y{CM/DC
color = blue, q[. p(6:
width = 3, LMp^]*)t
"signal output" "837b/>/
h=kC3ot\
;f: (set_L(x);P_out(pump)), !改变光纤长度对泵浦信号输出功率的影响
LGYg@DR
step = 20, color = red, width = 3,"residual pump" G//hZwf0
\@{TF((Y
! set_L(L_f) {restore the original fiber length } _+Pz~_+kS
u})8)
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; ------------- fK^;?4
diagram 4: !输出图表4 =W gzj|Kr
hSj@<#b>F
"TransverseProfiles" z6Nz)$!_i
)3 '8T>^<K
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) PM)nw;nS
\23m*3"W
x: 0, 1.4 * r_co /um pMf
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"radialposition (µm)", @x >52%^ ?
y: 0, 1.2 * I_max *cm^2 r\ C"Fx^
"intensity (W/ cm²)", @y gA] 3h8%w
y2: 0, 1.3 * N_Tm ?lU(FK
frame !2.eJ)G
hx wOEc~WOd
hy 9?sm-qP
}Am5b@g"$Y
f: N_dop(1, x * um,0), !掺杂浓度的径向分布 |Rm_8n%m
yscale = 2, {_Fh3gjb/
color = gray, -6e^`c6{
width = 3, {m_y<
maxconnect = 1, 7T(&DOGZ
"N_dop (right scale)" S>s+ nqcP
zu,Yuq
f: I(pump, -1, x *um, 0) * cm^2, !泵浦光沿光纤径向的强度分布 e?KzT5j:
color = red, Ns\};j?TU*
maxconnect = 1, !限制图形区域高度,修正为100%的高度 }>b@=5O
width = 3, p?4,YV|#
"pump" CsjrQ-#9yn
_9<Mo;C
f: I(signal_fw, -1,x * um, 0) * cm^2, !信号光沿光纤径向的强度分布 ~,x4cOdR#
color = blue, KppYe9?
maxconnect = 1, 5?f!hB|6
width = 3, \GZ|fmYn
"signal" nL]eGC
_Ec"[xW
RW<4",
; ------------- j-| !QlB
diagram 5: !输出图表5 D"IxQ2}k
uF[~YJ>
"TransitionCross-sections" R%`fd *g
AN)r(86L
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) fk\]wFj
^Iqu ^n?2.
x: 1450, 2050 (g1Op~EM
"wavelength(nm)", @x `w)yR>lqh
y: 0, 0.6 *Xh#W7,<
"cross-sections(1e-24 m²)", @y zd {sw}
frame S.pXo'}
hx `r0lu_.$]4
hy &%u m#XE
7t/Y5Qf
f: s12_Tm(x * nm) /1e-24, !Tm3+吸收截面与波长的关系 LyG`q3@
color = red, & u6ydN1xe
width = 3, #L&/o9|
"absorption" G?Za/G
f: s21_Tm(x * nm) /1e-24, !Tm3+发射截面与波长的关系 % pAbkb3m
color = blue, `$3ktQ $
width = 3, v<mSd2B*
"emission" .eyJ<b9
wn\R|'Rdz