(* i{Ds&{
Demo for program"RP Fiber Power": thulium-doped fiber laser, nL-K)G,
pumped at 790 nm. Across-relaxation process allows for efficient dg_G s>?2
population of theupper laser level. O"Q7Rx
*) !(* *)注释语句 x`%JI=q
%%JMb=!%2
diagram shown: 1,2,3,4,5 !指定输出图表 ++jAz<46
; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 tU:EN;H
; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 kXrlSaIc
; 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 &%mXYj3y5
; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 t e,[f
; 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 gE])!GMM3
,|h)bg7.
include"Units.inc" !读取“Units.inc”文件中内容 aG%,cQ 1
-LW[7s$
include"Tm-silicate.inc" !读取光谱数据 `$TRleSi
4(8xjL:
; Basic fiberparameters: !定义基本光纤参数 Vzl^Ka'
L_f := 4 { fiberlength } !光纤长度 u0Nm.--;_3
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 t0)<$At6J
r_co := 6 um { coreradius } !纤芯半径 IzLQhDJ1
N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 (Pbg[AY
T~4N+fK
; Parameters of thechannels: !定义光信道 5d\q-d
l_p := 790 nm {pump wavelength } !泵浦光波长790nm ~*W!mlg
dir_p := forward {pump direction (forward or backward) } !前向泵浦 /i]y$^
P_pump_in := 5 {input pump power } !输入泵浦功率5W T~:|!`
w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um _iV]_\0W2
I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 5jxQW
;
loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 ?OlV"zK
_zWfI.o
l_s := 1940 nm {signal wavelength } !信号光波长1940nm [U/(<?F{(
w_s := 7 um !信号光的半径 Np+&t}
I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 o*rQP!8,oy
loss_s := 0 !信号光寄生损耗为0 eKvV*[Na
Qnd5X`jF#
R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 Av' GB
H1n1-!%d
; 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 VVP:w%yW
calc /FP5`:PfL
begin n\z,/'d"
global allow all; !声明全局变量 Uyx!E4pl(
set_fiber(L_f, No_z_steps, ''); !光纤参数 #~O b)q|
add_ring(r_co, N_Tm); $(e#aHB
def_ionsystem(); !光谱数据函数 ?';OD3-
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 ,\2:/>2
signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 B=8Iu5m
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 -#!x|ne
set_R(signal_fw, 1, R_oc); !设置反射率函数 6(d }W2GP
finish_fiber(); #n0Y6Pr
end; 3I\n_V<
/zDi9W*~1
; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 U-/{0zB
show "Outputpowers:" !输出字符串Output powers: .
\
show"pump: ", P_out(pump):d3:"W" !输出字符串pump:和计算值(格式为3个有效数字,单位W) :0& X^]\
show"signal: ",P_out(signal_fw):d3:"W" !输出字符串signal:和计算值(格式为3个有效数字,单位W) OCZaQ33
^sN (
ABE@n%|`
; ------------- ;2'q_Btk4
diagram 1: !输出图表1 M])dJ9&e
<Rh6r}f
"Powers vs.Position" !图表名称 6`vC1PK^
EI!6MC)
x: 0, L_f !命令x: 定义x坐标范围 AdRX`[ik
"position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 mKo C.J
y: 0, 15 !命令y: 定义y坐标范围 !aO` AC=5u
y2: 0, 100 !命令y2: 定义第二个y坐标范围 ;4N;D
frame !frame改变坐标系的设置 !*6CWV0
legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) 7qTE('zt
hx !平行于x方向网格 L|bwZ,M=}?
hy !平行于y方向网格 mU}F!J#6
!,V{zTR
f: P(pump, x), !命令f: 定义函数图;P(pump, x)函数是计算x位置处的泵浦光功率 z~`b\A,$
color = red, !图形颜色
Uf}\p~;
width = 3, !width线条宽度 5onm]V]
"pump" !相应的文本字符串标签 Vz6Qxd{m3
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 |$5[(6T|
color = blue, AL>$HB$
width = 3, Sb~MQ_
"fw signal" da)NK!
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 Xy5e5K
color = blue, g=I8@m
style = fdashed, ZXm/A0)S
width = 3, Y>'|oygHA
"bw signal" J9~g|5
qucq,Yw
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 jH_JmYd
yscale = 2, !第二个y轴的缩放比例 \hCH>*x<
color = magenta, [jmd
width = 3, q$=#A7H>3)
style = fdashed, 8#vc(04(
"n2 (%, right scale)" -[-wkC8a
L|p
Z$HB
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 O{#=d
yscale = 2, n=[/Z!
color = red, }iuWAFZbGS
width = 3, iX)%Q
style = fdashed, hdrm!aBd
"n3 (%, right scale)" R?]02Q
1dK*y'rx
>y,-v:Vy
; ------------- eH{[C*
diagram 2: !输出图表2 K5lmVF\$P
Hw4%uS==V
"Variation ofthe Pump Power" :Y [LN
'3g[]M@M
x: 0, 10 55z]&5N
"pump inputpower (W)", @x 4ecP*g
y: 0, 10 F]<Xv"
y2: 0, 100 (SvWvm
frame =zz~kon9
hx ,N)/w1?I
hy HPZ}*m'
legpos 150, 150 /HaHH.e
xoN3
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 ml+; Rmvb
step = 5, RNe^;
B
color = blue, 6ZP"p<xX
width = 3, \ZkA>oO".
"signal output power (W, leftscale)", !相应的文本字符串标签 [C'JH//q*t
finish set_P_in(pump, P_pump_in) _WRFsDZ'
,LnII
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 JT!9\i
yscale = 2, I "A_b}~*}
step = 5, Y/*mUS[oa
color = magenta, rogT~G}q
width = 3, %4gg@Z9
"population of level 2 (%, rightscale)", 2I,^YWR
finish set_P_in(pump, P_pump_in) ):[7E(F=
32`{7a3!=
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 ]jo1{IcI
yscale = 2, uo@n(>}EL
step = 5, fR(d
color = red, tg<EY!WY
width = 3, N(Fp0
"population of level 3 (%, rightscale)", T[g[&K1Y
finish set_P_in(pump, P_pump_in) SMpH._VFeE
v]B3m
A\HxDIU
; ------------- F9,DrB,B{
diagram 3: !输出图表3 &B6Ep6QS
~Vr.J}]J
"Variation ofthe Fiber Length" sTn<#l6
xHD=\,{ig
x: 0.1, 5 )-a'{W/t
"fiber length(m)", @x %H]ptH5
y: 0, 10 +%ee8|\
"opticalpowers (W)", @y s~5[![1
K
frame hEKf6#
hx u>2
l7PA|
hy hoK>~:;
_./Sk|C
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 E87Ww,z8
step = 20, e4?>-
color = blue, lh7jux
width = 3, l1BtI_7p
"signal output" [XEkz#{
~?d Nd
;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 >7jbgHB
step = 20, color = red, width = 3,"residual pump" 1_PoqD!q
9\_eK,*B
! set_L(L_f) {restore the original fiber length } |}=acc/
1v.c 6~
A%KDiIA
; ------------- H[,i{dD
diagram 4: !输出图表4 a7r%X -
n"G&ENN"$
"TransverseProfiles" $u]jy0X<Y;
4T|b
Cs?e
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) c;Pe/ d
6-$jkto
x: 0, 1.4 * r_co /um 2$+bJJM
"radialposition (µm)", @x 2^h27A
y: 0, 1.2 * I_max *cm^2 -GhP9; d
"intensity (W/ cm²)", @y O}-jCW;K
y2: 0, 1.3 * N_Tm J:CXW%\ <q
frame hI]Hp3S
hx }wr{W:j
hy m% -g ~q
w$zu~/qV2
f: N_dop(1, x * um,0), !掺杂浓度的径向分布 }X)&zenz
yscale = 2, CZud&
<
color = gray, \^L`7cBL
width = 3, V58wU:li
maxconnect = 1, Mm.<r-b
"N_dop (right scale)" x@P y>f2
%b&".mN
f: I(pump, -1, x *um, 0) * cm^2, !泵浦光沿光纤径向的强度分布 LlX{#R
color = red, _=_Px@<Q
maxconnect = 1, !限制图形区域高度,修正为100%的高度 UO0{):w>
width = 3, %7zuQ \w
"pump" b6nsg|
-]/I73!b
f: I(signal_fw, -1,x * um, 0) * cm^2, !信号光沿光纤径向的强度分布 BLfTsNzmt
color = blue, gd%NkxmW
maxconnect = 1, Aw$x;3y
width = 3, {> eXR?s/
"signal" rI= v
K28+]qy[
I4/8 _)b^
; ------------- "& ])lz[u
diagram 5: !输出图表5 =mS\i663
SQBa;hvgM
"TransitionCross-sections" +giyX7BPJ
q)LMm7
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) %HGD;_bhI
_ky,;9G]
x: 1450, 2050 LJd5;so-
"wavelength(nm)", @x E7t+E)=8
y: 0, 0.6 FQu8vwV6>
"cross-sections(1e-24 m²)", @y h1B? 8pD
frame wQqb`l7+
hx ]op}y0
hy ?5C!<3gM)
f[<m<I
f: s12_Tm(x * nm) /1e-24, !Tm3+吸收截面与波长的关系 e<3K;Q
color = red, N4^-`
width = 3, X
iS1\*
"absorption" JlH&??
f: s21_Tm(x * nm) /1e-24, !Tm3+发射截面与波长的关系 En~5"yW5>]
color = blue, 10)jsA
width = 3, +c(zo4nZ
"emission" YLqGRE`W
9>l*lCA