(* nFG X2|d
Demo for program"RP Fiber Power": thulium-doped fiber laser, ,%xat`d3,3
pumped at 790 nm. Across-relaxation process allows for efficient is^R8a
population of theupper laser level. l$c/!V[3
*) !(* *)注释语句 hslT49m>
t5K#nRd Z:
diagram shown: 1,2,3,4,5 !指定输出图表 \eQPvkx2
; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 %P<fz1
; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 dQ-g\]d|
; 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 US9aW)8
; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 mr#.uhd.z
; 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
fB]2"(
!- QB>`7$
include"Units.inc" !读取“Units.inc”文件中内容
ip{b*@K
|r;>2b/ x
include"Tm-silicate.inc" !读取光谱数据 L1Yj9i
!J<0.nO/:
; Basic fiberparameters: !定义基本光纤参数 "10\y{`v^
L_f := 4 { fiberlength } !光纤长度 s!D2s2b9e
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-P o'RW
r_co := 6 um { coreradius } !纤芯半径 >Sk%78={R
N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 4,X CbcC
1)ij*L8k
; Parameters of thechannels: !定义光信道 \vV]fX
l_p := 790 nm {pump wavelength } !泵浦光波长790nm =+DhLH}8
dir_p := forward {pump direction (forward or backward) } !前向泵浦 3y2L!&'z
P_pump_in := 5 {input pump power } !输入泵浦功率5W 0~WXA=XG
w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um +/mCYI
I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 >>C
S8
loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 09Eg ti.
P()W\+",n
l_s := 1940 nm {signal wavelength } !信号光波长1940nm y,n.(?!*
w_s := 7 um !信号光的半径 y,`0f|
I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 E
U RKzJk
loss_s := 0 !信号光寄生损耗为0 $;=?[Cn
xmC5uT6L3M
R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 |)%H_TXTy
Oz]$zRu/0
; 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 a#CjGj)
calc FS @55mQ
begin HEa7!h[a'
global allow all; !声明全局变量 u=~`5vA
set_fiber(L_f, No_z_steps, ''); !光纤参数 '
\>k7?@
add_ring(r_co, N_Tm); G
OG[^T
def_ionsystem(); !光谱数据函数 OR+py.vK
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 LXrk5>9
signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 8$iHd
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 p*@t$0i
set_R(signal_fw, 1, R_oc); !设置反射率函数 FoZI0p?L)9
finish_fiber(); j!k$SDA-
end; Q/j#Pst
F,pKt.x
; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 KE5>O1
show "Outputpowers:" !输出字符串Output powers: M80O;0N%A
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) c3PA<q[
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) ).e}.Z6[i`
^AOJ^@H^>
4sH?85=j
; ------------- e8(Qx3T?b
diagram 1: !输出图表1 D88IU9V&n
w6Mv%ZO_
"Powers vs.Position" !图表名称 -w)v38iX!
" L,9.b
x: 0, L_f !命令x: 定义x坐标范围 l)jP!k
"position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 .i|nn[H &
y: 0, 15 !命令y: 定义y坐标范围 {:n1|_r4Z
y2: 0, 100 !命令y2: 定义第二个y坐标范围 4N7|LxNNl_
frame !frame改变坐标系的设置 Vl<7>
legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) {KEmGHC4R
hx !平行于x方向网格 =kK%,Mr
hy !平行于y方向网格 .We{W{
]8Xip/uE
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 /?TR_>
color = red, !图形颜色 $ZB`4!JxG
width = 3, !width线条宽度 aZtM
_
"pump" !相应的文本字符串标签 `Nz`5}8.?
f: P(signal_fw, x), !P(signal_fw ,x) 函数是计算x位置处的前向信号光功率 NB.'>Sar
color = blue, \&Bdi6xAy
width = 3, -2 8bJ,
"fw signal" ,\RR@~u'
f: P(signal_bw, x), !P(signal_bw ,x) 函数是计算x位置处的后向信号光功率 ;/+U.I%z
color = blue, QX=x^(M$m
style = fdashed, @*UV|$~(Q
width = 3, # M!1W5#
"bw signal" ,]n~j-X
pNmWBp|ER
f: 100 * n(x, 2), !n(x ,2) 函数是计算x位置处激活粒子数在能级2上的占比 V 7ZGT
yscale = 2, !第二个y轴的缩放比例 Y)(yw \&v
color = magenta, e VQ-?DK
width = 3, :Y9/} b{
style = fdashed, 6'<[QoW];
"n2 (%, right scale)" I6@"y0I
)_4()#3
f: 100 * n(x, 3), !n(x ,3) 函数是计算x位置处激活粒子数在能级3上的占比 )24M?R@r
yscale = 2, 8`]yp7ueS
color = red, vr2PCG[~
width = 3, ?*7Mn`
style = fdashed, Nqz6_!
"n3 (%, right scale)" \ptjnwC^O
DrxQ(yo}
M1*bT@6
; ------------- E'SDT*EI
diagram 2: !输出图表2 WNQ<XBqAw
l5KO_"hy
"Variation ofthe Pump Power" G\V*j$}!
'ShK7j$
x: 0, 10 * >8EMq\^
"pump inputpower (W)", @x 3 5L0CM
y: 0, 10 %*Uc,V
y2: 0, 100 +PKsiUJ|
frame m&'!^{av
hx 1Ax;|.KQH
hy GCfVH?Vx
legpos 150, 150 /m 7~-~$V
be5N{lPT@;
f: (set_P_in(pump, x);P_out(signal_fw)), !set_P_in(pump,x)改变泵浦信道功率;P_out(signal_fw)输出前向信号光
@';.$
step = 5, ~#}T|
color = blue, !7MRHI/0C
width = 3, (hQi {
"signal output power (W, leftscale)", !相应的文本字符串标签 ;ny 9q
finish set_P_in(pump, P_pump_in) ={N1j<%fh
g]`YI5
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 #h4FLF_w
yscale = 2, P~iZae
step = 5, n&?)gKL0g
color = magenta, eR6vO5to
width = 3, K{"hf:k
"population of level 2 (%, rightscale)", )4c?BCgy
finish set_P_in(pump, P_pump_in) fBv:
TC%
CA5`uh
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 lmD[Cn
yscale = 2, ^w<aS
w
step = 5, :XG~AR/
color = red, R<{Vgy
width = 3, cF8 X
"population of level 3 (%, rightscale)", ,u)jZ7
finish set_P_in(pump, P_pump_in) aW{5m@p{"
ACZK]~Y'N*
>!a- "
; ------------- `ZI -1&Y3
diagram 3: !输出图表3 '\xE56v)F
RwOOe7mv
"Variation ofthe Fiber Length" \x]\W#C
5s`r&2 w
x: 0.1, 5 =+ >>l0=_v
"fiber length(m)", @x xSSEDfq
y: 0, 10 ;e/F( J
"opticalpowers (W)", @y 150-'Q
frame 6o(IL-0]c
hx
6ST(=X_C
hy >8=lX`9f{
g=@d!]Z~[
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 4nh=Dq[
step = 20, /sT?p=[.
color = blue, voN~f>
width = 3, ms&1P
"signal output" 5\#I4\
: MjDcI~
;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 #RaqNu
step = 20, color = red, width = 3,"residual pump" K%x]:|,>M
Ro"'f7(v.
! set_L(L_f) {restore the original fiber length } m|c[C\)By
6l;2kztGp
i$PO#}
; ------------- ^7YNM<_%@
diagram 4: !输出图表4 /WE\0bf
mTxqcQc:7
"TransverseProfiles" [YHtBM:y
O#=%t
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) rqqd} kA
VwPoQ9pIS
x: 0, 1.4 * r_co /um {5<fvMO!6
"radialposition (µm)", @x :-JryiI
y: 0, 1.2 * I_max *cm^2 AD?XJ3
"intensity (W/ cm²)", @y p^RX<L/\=_
y2: 0, 1.3 * N_Tm h@G~'\8t
frame ,1N|lyV
hx 'hs4k|B
hy gK({InOP
w]{c*4o
f: N_dop(1, x * um,0), !掺杂浓度的径向分布 PgT8
1u
yscale = 2, 111A e*U
color = gray, -mG`* 0
width = 3, Zp~yemERr
maxconnect = 1, 2tpu v(H;
"N_dop (right scale)" M>p<1`t-&
ob;|%_
f: I(pump, -1, x *um, 0) * cm^2, !泵浦光沿光纤径向的强度分布 D_czUM
color = red, SM4`Hys;p
maxconnect = 1, !限制图形区域高度,修正为100%的高度 w3);ZQ|
width = 3, 4d PTrBQ?
"pump" `Y4K w
kex V~Q
f: I(signal_fw, -1,x * um, 0) * cm^2, !信号光沿光纤径向的强度分布 xwof[BnEZ
color = blue, E(|A"=\
maxconnect = 1, dVEs^ZtI
width = 3, $">j~! '
"signal" A`f"<W-m
Fw\Z[nh
cVL|kYVWT
; ------------- QDQ"Sc06
diagram 5: !输出图表5 {eaR,d~X
f/#Id]B
"TransitionCross-sections"
\\KjiT'
NOXP}M
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) ZxwrlaA
s~A-qG>
x: 1450, 2050 D~ Y6%9
"wavelength(nm)", @x 8e*skL
y: 0, 0.6 +?o!"SJ
"cross-sections(1e-24 m²)", @y 4F#H$`:[
frame ?0qD(cfx<
hx [-_{3qq<e
hy EOrui:.B)
'QT~o-U
f: s12_Tm(x * nm) /1e-24, !Tm3+吸收截面与波长的关系 }]o8}$&(
color = red, ]wU/yc)e
width = 3, nZ(]WPIN"
"absorption" P>X[}
f: s21_Tm(x * nm) /1e-24, !Tm3+发射截面与波长的关系 l1DJ<I2
color = blue, 2MRd
width = 3, ,X^3.ILz
"emission" Ol RXgJ
`5?0yXK