(* o+`W
Demo for program"RP Fiber Power": thulium-doped fiber laser, =| S8.|r+
pumped at 790 nm. Across-relaxation process allows for efficient -N ^}1^gA
population of theupper laser level. O\pqZ`E=s
*) ！（* *）注释语句 h1G]w/.w s
hE-`N,i }
diagram shown: 1,2,3,4,5 ！指定输出图表 #*,Jqr2f
; 1: "Powersvs. Position" ！分号是注释；光纤长度对功率的影响 *fW&- ic
; 2:"Variation of the Pump Power" ！泵浦光功率变化对信号输出功率的影响 a)PBC{I
; 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 FIlw
; 4:"Transverse Profiles" ！横向分布，横坐标为半径位置 UtG@0(6C
; 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 @ )m[: n
D4G*K*z,w4
include"Units.inc" ！读取“Units.inc”文件中内容 D} px=?
3 =@7:4 A
include"Tm-silicate.inc" ！读取光谱数据 D; H</5#Q
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; Basic fiberparameters: ！定义基本光纤参数 >BMJA:j
L_f := 4 { fiberlength } ！光纤长度 7<x0LW
No_z_steps := 50 {no steps along the fiber } ！光纤步长，大括号{ }是注释，相当于备注 : RnjcnR
r_co := 6 um { coreradius } ！纤芯半径 vLD Ma>
N_Tm := 100e24 { Tmdoping concentration } ！纤芯Tm离子掺杂浓度 < Up n~tH
*pw:oT O
; Parameters of thechannels: ！定义光信道 kOETx
l_p := 790 nm {pump wavelength } ！泵浦光波长790nm 7'7bIaJk
dir_p := forward {pump direction (forward or backward) } ！前向泵浦 Us k@{
P_pump_in := 5 {input pump power } ！输入泵浦功率5W ?`AzgM[I
w_p := 50 um {radius of pump cladding } ！包层泵浦相应的半径 50um qi`*4cas*A
I_p(r) := (r <=w_p) { pump intensity profile } ！泵浦光强度分布 * :\-:*
loss_p := 0 {parasitic losses of pump wave } ！泵浦光寄生损耗为0 wJ1qJ!s@
|;6FhDW+'
l_s := 1940 nm {signal wavelength } ！信号光波长1940nm Lg|j0-"N
w_s := 7 um ！信号光的半径 b:\I*WJ
I_s(r) := exp(-2 *(r / w_s)^2) ！信号光的高斯强度分布 ]o$Kh$~5
loss_s := 0 ！信号光寄生损耗为0 MG [?C2KA/
6.~ HbN
R_oc := 0.70 {output coupler reflectivity (right side) } ！输出耦合反射率 UB&ofO
m/=,O_
; 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 (k6= o';y
calc [ hm/B`t*e
begin Hlp!6\gukp
global allow all; ！声明全局变量 wWY6DQQB
set_fiber(L_f, No_z_steps, ''); ！光纤参数 _ D1bR7
add_ring(r_co, N_Tm); qnyFR P C
def_ionsystem(); ！光谱数据函数 :35J<oG
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); ！泵浦光信道 3Fo,F
signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); ！前向信号光信道 A;1<P5lo
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); ！后向信号光信道 Cq
!VMl>hP
set_R(signal_fw, 1, R_oc); ！设置反射率函数 K7M 7T5<
finish_fiber(); z(g 4D!
end; cInzwdh7
jMcCu$i7
; Display someoutputs in the Output window (on the right side): ！在Output aera区域显示输出 QKCc5
show "Outputpowers:" ！输出字符串Output powers： ?CA P8 _
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） =\J^_g4-l
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） $V]D7kDph*
9Wb9g/L
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; ------------- [Rs5hO
diagram 1: !输出图表1 } !pC}m
/(BQzCP9O;
"Powers vs.Position" ！图表名称 g (ZeGNV8
q Xt 2 m
x: 0, L_f ！命令x: 定义x坐标范围 ?q7V B
"position infiber (m)", @x ！x轴标签；@x 指示这些字符串沿坐标轴放置 }KCXo/y
y: 0, 15 ！命令y: 定义y坐标范围 +NxEx/{
y2: 0, 100 ！命令y2: 定义第二个y坐标范围 W~. 1f1)
frame ！frame改变坐标系的设置 BEg%u)"([
legpos 600, 500 ！图行在图表窗口中的位置（相对于左上角而言） 5Jp@n .
hx ！平行于x方向网格 8~ .r/!wfy
hy ！平行于y方向网格 X4BDl
Z=z'j8z3
f: P(pump, x), ！命令f: 定义函数图；P(pump, x)函数是计算x位置处的泵浦光功率 kR%CSLOVy
color = red, ！图形颜色 {}D8Y_=9\
width = 3, ！width线条宽度 Fb*^GH)J
"pump" ！相应的文本字符串标签 )$P!7$C-
f: P(signal_fw, x), ！P(signal_fw ,x) 函数是计算x位置处的前向信号光功率 k^ B'W{
color = blue, j()_
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width = 3, }LM^>M%
"fw signal" t .j q]L
f: P(signal_bw, x), ！P(signal_bw ,x) 函数是计算x位置处的后向信号光功率 ~uq J@#o{
color = blue, W6K]jIQ
style = fdashed, l4O}>#
width = 3,
M)Y u^
"bw signal" wS%I.
x(h UQu 6
f: 100 * n(x, 2), ！n(x ,2) 函数是计算x位置处激活粒子数在能级2上的占比 -F4CHpua
yscale = 2, ！第二个y轴的缩放比例 ?%JH4I2
color = magenta, pA!+;Y!ZB<
width = 3, TiCp2Rsz
style = fdashed, Fw!5hR`,
"n2 (%, right scale)" CP7Zin1S/w
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f: 100 * n(x, 3), ！n(x ,3) 函数是计算x位置处激活粒子数在能级3上的占比 {p 9y{$
yscale = 2, /6gqpzum4
color = red, b^y#.V.|k
width = 3, 5ii`!y
style = fdashed, NrgN{6u;
"n3 (%, right scale)" " h_n/}r=
S@Yb)">ZQ
6.EfM^[
; ------------- [uc;M6o}?
diagram 2: ！输出图表2
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"Variation ofthe Pump Power" ;T"}dJel#
WQv~<]1J F
x: 0, 10 yf3%g\k
"pump inputpower (W)", @x AcrbR&cvG
y: 0, 10 +_Fsiu_b
y2: 0, 100 q}ZZqYk
frame (FH4\ 't)
hx fk*JoR.o
hy I?4J69'
legpos 150, 150 zST# X }
/ w_ Sc{
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 x\3 ` W
step = 5, +SrE
color = blue, Gd%6lab
width = 3, 9C|T/+R
"signal output power (W, leftscale)", ！相应的文本字符串标签 ,{%/$7)
finish set_P_in(pump, P_pump_in) gSZ NsiH
Q7"KgqpQ3
f: (set_P_in(pump,x); 100 * n_av(2)), ！改变泵浦信号功率对能级2上激活粒子占比的影响 .3{S6#
yscale = 2, 9{70l 539
step = 5, A.
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color = magenta, "LaNXZ9
width = 3, ~< Gs<c}z
"population of level 2 (%, rightscale)", gLl?e8[F
finish set_P_in(pump, P_pump_in) g}ciG!0
tI*u"%#t
f: (set_P_in(pump,x); 100 * n_av(3)), ！改变泵浦信号功率对能级3上激活粒子占比的影响 o7/_a/
yscale = 2, ;l4rg!r(S
step = 5, q,aWF5m@
color = red, Arir=q^2
width = 3, qAR~j s`5
"population of level 3 (%, rightscale)", "Z &qOQg%3
finish set_P_in(pump, P_pump_in) r$k
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BB--UM{7
"SLN8x49(
; ------------- "!E(= W?
diagram 3: ！输出图表3 8Dhq_R'r
Fd m7k){A
"Variation ofthe Fiber Length" ,EcmMI^A
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x: 0.1, 5 >9+@oGe(E
"fiber length(m)", @x 2?Q IK3"v
y: 0, 10 C.8]~MP
"opticalpowers (W)", @y pUwx`"DrR
frame y"e 'Gg2
hx .A\9|sRZ5
hy %3fHitCikc
kul&m|
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 0e q>
step = 20, _m3PA D4
color = blue, ^5=}Y>EJO
width = 3, k W/3
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"signal output" ?h1]s&^| 2
2~R"3c+^
;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 vB/M nEKR
step = 20, color = red, width = 3,"residual pump" J^n(WnM*F
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c~
! set_L(L_f) {restore the original fiber length } +c}fDrr)
f]T#q@|lE
}`f%"Z
; ------------- C<qJnB:B 9
diagram 4: ！输出图表4 ^B?{X|U37
$Jb+}mlT
"TransverseProfiles" jTSw 0\}
?*[t'D9f-
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) `@ ?l{
CN\s,. ]
x: 0, 1.4 * r_co /um 9p2 "5x
"radialposition (µm)", @x {r[ *}Bv
y: 0, 1.2 * I_max *cm^2 +P}'2tE~'
"intensity (W/ cm²)", @y _)2N Fq
y2: 0, 1.3 * N_Tm RUX!(Xw
frame T=;'"S
hx > ^n'
hy C* kZ>mbc
_P,fJ`w
f: N_dop(1, x * um,0), ！掺杂浓度的径向分布 H'?Bx>X
yscale = 2,
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color = gray, fJc,KZy
width = 3, s67$tlV
maxconnect = 1, .LnXKRd{
"N_dop (right scale)" dE/Vl/ :
Mgcq'{[~Y=
f: I(pump, -1, x *um, 0) * cm^2, ！泵浦光沿光纤径向的强度分布 J>!p^|S{
color = red, WAqR70{KM
maxconnect = 1, ！限制图形区域高度，修正为100%的高度 p_B,7@Jl
width = 3, =2J+} ac
"pump" 7lR(6ka&/
V aVKWJg$
f: I(signal_fw, -1,x * um, 0) * cm^2, ！信号光沿光纤径向的强度分布 |I)xK@7
color = blue, *7BY$ q
maxconnect = 1, 1m}'Y@I
width = 3, "Q2[A]4E
"signal" 6S"bW)O
'qQ DM_+
gT O%
; ------------- L_)?5IOJ$
diagram 5: ！输出图表5 <C#
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"TransitionCross-sections" [OH>NpL
Zu&trxnNf[
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) Ls*.=ARq
G\jr^d\
x: 1450, 2050 hl6al:Y
"wavelength(nm)", @x |06J4H~k
y: 0, 0.6 8ru@ 8|r
"cross-sections(1e-24 m²)", @y LO# {
frame cpu +"/\
hx *Vv ;NA/
hy .N/4+[2p(
u`E_Q8
f: s12_Tm(x * nm) /1e-24, ！Tm3+吸收截面与波长的关系 OK3 B6T5w=
color = red, 2k CJqyWy
width = 3, RD{jYr;
"absorption" pA+Qb.z5z
f: s21_Tm(x * nm) /1e-24, ！Tm3+发射截面与波长的关系 ,A[HYc|uy
color = blue, 9FP l
width = 3, `n5RDz/f0
"emission" bsqoR8
0v Qkm<
