(* 20` XklV
Demo for program"RP Fiber Power": thulium-doped fiber laser, NA/Sv"7om
pumped at 790 nm. Across-relaxation process allows for efficient @wP.Rd
population of theupper laser level. 6Q+VW_~
*) !(* *)注释语句 "/UPq6
|L-- j
diagram shown: 1,2,3,4,5 !指定输出图表 ?o/p}6
; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 N5k9o:2
; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 q?L*Luu+
; 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 F0r5$Pl*
; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 HBk5p>&
; 5:"Transition Cross-sections" !不同波长的跃迁横截面,横坐标波长,纵坐标为横截面 ~Sd,Tu%:
f)Z'#[A*t7
include"Units.inc" !读取“Units.inc”文件中内容 %VXIiu[
F[.IF5_
include"Tm-silicate.inc" !读取光谱数据 JKCV>k
MzlE
; Basic fiberparameters: !定义基本光纤参数 6e}T
zc\@(
L_f := 4 { fiberlength } !光纤长度 <!|=_W6
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 L9whgXD
r_co := 6 um { coreradius } !纤芯半径 +yHzp
N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 CyB1`&G>
Ag1nxV1M$
; Parameters of thechannels: !定义光信道 '64/2x
l_p := 790 nm {pump wavelength } !泵浦光波长790nm
Ox'KC
dir_p := forward {pump direction (forward or backward) } !前向泵浦 5pRVA
P_pump_in := 5 {input pump power } !输入泵浦功率5W *\Hut'7 d
w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um U2JxzHXZ
I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 _tO2PIL@Z
loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 n4ti{-^4|d
W}wd?WIps
l_s := 1940 nm {signal wavelength } !信号光波长1940nm tfe'].uT
w_s := 7 um !信号光的半径 %]O#t<D
I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 \OK}DhY#
loss_s := 0 !信号光寄生损耗为0 BMhuM~?(
0upZ4eN
R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 HI)U6.'
];0:aSi#
; 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 v\kd78,
calc wo^1%:@/2
begin W*4!A\K
global allow all; !声明全局变量 <)@^TRS
set_fiber(L_f, No_z_steps, ''); !光纤参数 uQWd`7
add_ring(r_co, N_Tm); O}7aX '
def_ionsystem(); !光谱数据函数 ]d&;QZ#w
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道
"M]`>eixL
signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 "xD5>(|^+Q
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 +6Vu]96=KC
set_R(signal_fw, 1, R_oc); !设置反射率函数 } x'o`GuUf
finish_fiber(); '9|R7
end; Gs}lw'pK
;[Hrpl
S
; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 8ZO~=e
show "Outputpowers:" !输出字符串Output powers: .q$/#hN:e
show"pump: ", P_out(pump):d3:"W" !输出字符串pump:和计算值(格式为3个有效数字,单位W) %E2C4UbY
show"signal: ",P_out(signal_fw):d3:"W" !输出字符串signal:和计算值(格式为3个有效数字,单位W) ra\|c>[%
i{>YQ
WF<*rl
; ------------- Q9t.*+
diagram 1: !输出图表1 a3(f\MMxE
zU};|Zw
"Powers vs.Position" !图表名称 JhB$s
;WL0
x: 0, L_f !命令x: 定义x坐标范围 6[>Z y)P
"position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 :#W>lq@H
y: 0, 15 !命令y: 定义y坐标范围 #DHeEE
y2: 0, 100 !命令y2: 定义第二个y坐标范围 S'vUxOAo
frame !frame改变坐标系的设置 3-2?mV>5
legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) d _koF-7
hx !平行于x方向网格 faI4`.i
hy !平行于y方向网格 N;e*eMFE
%!)Dk<
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 9}Zi_xK&|e
color = red, !图形颜色 9'JkLgz;d+
width = 3, !width线条宽度 )$I"LyK)
"pump" !相应的文本字符串标签 eYRm:KC
f: P(signal_fw, x), !P(signal_fw ,x) 函数是计算x位置处的前向信号光功率 ^kj%Ekt7
color = blue, 885
,3AdA
width = 3, cNqw(\rr
"fw signal" v_@!u`
f: P(signal_bw, x), !P(signal_bw ,x) 函数是计算x位置处的后向信号光功率 px_%5^zRQ
color = blue, \R<OT%8
style = fdashed,
'+C%]p
width = 3, [x|{VJ(h
"bw signal" 93#wU})
k$} 6Qd
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 \t@|-`
yscale = 2, !第二个y轴的缩放比例 JTB5#S4W
color = magenta, (*Y ENT}
width = 3, Cqk6I gw
style = fdashed, y<5xlN(+v
"n2 (%, right scale)" DnPV
Tp(>
Q /\Hc
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 ZCVN+::Y
yscale = 2, h9J
color = red, aG\B?pn-
width = 3, Z@`HFZJ
style = fdashed, qT L@N9
"n3 (%, right scale)" $eBE pN
sWnU*Q
}'
t*BaU
; ------------- (wIpq<%
diagram 2: !输出图表2 _/!IjB:(70
ffYiu4$m
"Variation ofthe Pump Power" th*E"@
BK]q^.7+:
x: 0, 10 /P|jHK|{
"pump inputpower (W)", @x !P0Oq)q
y: 0, 10 SLc'1{
y2: 0, 100 {GiR-q{t
frame -.E<~(fad
hx $Mp#tH28
hy 1jozM"H7Q
legpos 150, 150 z7J2O
5<ycF_
f: (set_P_in(pump, x);P_out(signal_fw)), !set_P_in(pump,x)改变泵浦信道功率;P_out(signal_fw)输出前向信号光 w#,C{6
step = 5, ~(`iR xK
color = blue, f"5vpU^5*
width = 3, QY<2i-A
"signal output power (W, leftscale)", !相应的文本字符串标签 R{hKl#j;>
finish set_P_in(pump, P_pump_in) l8hOr yB&
`=Hh5;ep
f: (set_P_in(pump,x); 100 * n_av(2)), !改变泵浦信号功率对能级2上激活粒子占比的影响 =6TD3k6(2
yscale = 2, 7=8e|$K_
step = 5, y8un&LP
color = magenta, ;HJ|)PN5L
width = 3, ~$i36"
"population of level 2 (%, rightscale)", {e?D6`#x
finish set_P_in(pump, P_pump_in) b#^UP
jC<!Ny-$
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 GV([gs
yscale = 2, Dw^d!%Ala
step = 5, m>'sM1s
color = red, Khxl'qj
width = 3, >LwZ"IEV
"population of level 3 (%, rightscale)", Ed)t87E
finish set_P_in(pump, P_pump_in) }CA oB::&
*#,wV
g Xvuv^
; ------------- ND7
gxt-B
diagram 3: !输出图表3 FHI`/
j']m*aM1>
"Variation ofthe Fiber Length" B&yb%`9],W
_*+ 7*vAL
x: 0.1, 5 {ls$#a+d
"fiber length(m)", @x YzSUJ=0/
y: 0, 10 D`LcL|nmH
"opticalpowers (W)", @y <w.W[ak
frame ucyz>TL0
hx =LS?:Mhm
hy 1
{dhGX
]v3 9ag_hu
f: (set_L(x);P_out(signal_fw)), !改变光纤长度对信号光输出功率的影响 :0j9
step = 20, 9Ay*'
color = blue, ZUb6d*B
width = 3, >9(lFh0P
"signal output" V7!x-E/
&<-Sxjj
;f: (set_L(x);P_out(pump)), !改变光纤长度对泵浦信号输出功率的影响 xGJ{_M
step = 20, color = red, width = 3,"residual pump" m#mM2Guxe
<Vr"
! set_L(L_f) {restore the original fiber length } h\b]>q@
G_g~-[O
Y6/'gg'&5
; ------------- ` IiAtS
diagram 4: !输出图表4 =)(o(bfSKr
h84}lxT^]
"TransverseProfiles" 'QjX2ytgX
z{cI G8z
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) cTFyF)
AS[cz!
>
x: 0, 1.4 * r_co /um a1Qg&s<
"radialposition (µm)", @x JB a:))lw
y: 0, 1.2 * I_max *cm^2 1_THBL26d
"intensity (W/ cm²)", @y ;GO>#yg4Eh
y2: 0, 1.3 * N_Tm -82Rz
frame e;R5A6|
hx yw2^kk93|
hy ._"U{
f2V
`(<XdlOj
f: N_dop(1, x * um,0), !掺杂浓度的径向分布 V4}9f5FR
yscale = 2, l
njaHol0
color = gray, xjiMM>|n
width = 3, 7M<Ae
D%
maxconnect = 1, Zg%U4m:
"N_dop (right scale)"
SEF/D0
MVK='
f: I(pump, -1, x *um, 0) * cm^2, !泵浦光沿光纤径向的强度分布 r>sk@[4h
color = red, Zi[@xG8dm
maxconnect = 1, !限制图形区域高度,修正为100%的高度 p
mcy(<
width = 3, |_8-3
"pump" a1]k(AuQrC
*[(O&L&0
f: I(signal_fw, -1,x * um, 0) * cm^2, !信号光沿光纤径向的强度分布 ' D+h_*H
color = blue, qdrk.~_
maxconnect = 1, ^)conSm
width = 3, |j$&W;yC
"signal" f2B?Zn
gX5I`mm
i2/:'
i
; ------------- at${^,&
diagram 5: !输出图表5 }kdYR#{s
G eN('0
"TransitionCross-sections" .@ZqCH
&i4*tE3],
I_max :=maxr(I(pump, -1, 0, 0), I(signal_fw, -1, 0, 0)) ~cVFCM
6]rIYc[,
x: 1450, 2050 wIz<Y{HA=
"wavelength(nm)", @x 4:=']C
y: 0, 0.6 snOd
3Bw
"cross-sections(1e-24 m²)", @y
cHs@1R/-s
frame R_:47.qq
hx N&U=5c`Q'
hy }:7'C. ."
r.0IC*Y
f: s12_Tm(x * nm) /1e-24, !Tm3+吸收截面与波长的关系 *g]q~\b/;
color = red, +^YXqOXU
width = 3, t&^9o$
"absorption" s\,F6c
f: s21_Tm(x * nm) /1e-24, !Tm3+发射截面与波长的关系 `Lb^!6`)
color = blue, Wc ]BQn
width = 3, t/LQ|/xo
"emission" LCx{7bN1ro
@*e|{;X]hy