(* Y8xnvK*
Demo for program"RP Fiber Power": thulium-doped fiber laser, bB:X<
pumped at 790 nm. Across-relaxation process allows for efficient m6ws#%|[
population of theupper laser level. CoN/L`.SN
*) !(* *)注释语句 $Lbe5d?\
Br$PL&e~
diagram shown: 1,2,3,4,5 !指定输出图表 CO+jB
; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 $%"}N_M
; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 Y>m=cqR
; 3:"Variation of the Fiber Length"!信号输出功率vs 光纤长度的变化,仿真最佳光纤长度 JBJ7k19;
; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 3tcsj0Rb
; 5:"Transition Cross-sections" !不同波长的跃迁横截面,横坐标波长,纵坐标为横截面 7%FZXsD
p%y\`Nlgdx
include"Units.inc" !读取“Units.inc”文件中内容 t'/;Z:
:NyE d<'
include"Tm-silicate.inc" !读取光谱数据 ]<?)(xz
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; Basic fiberparameters: !定义基本光纤参数 4gNRln-
L_f := 4 { fiberlength } !光纤长度 ~0{Kga
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 ^<Tp-,J$EN
r_co := 6 um { coreradius } !纤芯半径 `*!>79_2C
N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 YGmdiY:;1
j7 3@Yi%
; Parameters of thechannels: !定义光信道 P&^7wud-sb
l_p := 790 nm {pump wavelength } !泵浦光波长790nm #E@i @'T
dir_p := forward {pump direction (forward or backward) } !前向泵浦 (` Mz.VN
P_pump_in := 5 {input pump power } !输入泵浦功率5W twS3J)UH
w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um Oo .Qz
I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 Z69IHA[
loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 `v{X@ x
* c
c+Fd
l_s := 1940 nm {signal wavelength } !信号光波长1940nm z$5C(! )
w_s := 7 um !信号光的半径 F}DD;K
I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 Y--8v#t
loss_s := 0 !信号光寄生损耗为0 !Qzp!k9d
A+DYIS
R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 eV%bJkt.
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; 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 p>O< "X@
calc nv{4
U}&P
begin 1*CWHs
global allow all; !声明全局变量 3) 0~:
set_fiber(L_f, No_z_steps, ''); !光纤参数 AAY UXY!
add_ring(r_co, N_Tm); lhj2u]yU0S
def_ionsystem(); !光谱数据函数 e!Okc*,
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 m3-J0D<
signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 ]<LU NxBR
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 ,RO(k4
set_R(signal_fw, 1, R_oc); !设置反射率函数 XOU$3+8q5
finish_fiber(); ='>UKy[=
end; ;qK6."b`;
=1[g`b
; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 ,quTMtk~
show "Outputpowers:" !输出字符串Output powers: !17Z\Ltqyj
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
|%
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) *b_54X%3
;BVhkWA
+}/!yQtH
; ------------- mkA|gM[g7
diagram 1: !输出图表1 O+j:L
J,Ap9HJt
"Powers vs.Position" !图表名称 GA}^Rh`T-
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x: 0, L_f !命令x: 定义x坐标范围 $'*BS
"position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 +cH(nZ*f
y: 0, 15 !命令y: 定义y坐标范围 2GzpWV(
y2: 0, 100 !命令y2: 定义第二个y坐标范围 `p|vutk)U
frame !frame改变坐标系的设置 2&URIQg*J
legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) G'f"w5%qZv
hx !平行于x方向网格 >cL2PN_y
hy !平行于y方向网格 c<e\JJY5?
F
k;su,]_
f: P(pump, x), !命令f: 定义函数图;P(pump, x)函数是计算x位置处的泵浦光功率 i@L2W>{P
color = red, !图形颜色 3fTI&2:
width = 3, !width线条宽度 s\!vko'M
"pump" !相应的文本字符串标签 Bdepvc}[#
f: P(signal_fw, x), !P(signal_fw ,x) 函数是计算x位置处的前向信号光功率 #+k[[; 0
color = blue, T%/w^27E
width = 3, Q$j48,e
"fw signal" tvRy8u;
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 1bkUT_
color = blue, hh&y2#Io
style = fdashed, pa-4|)qY
width = 3, 1+($"$ZC&B
"bw signal" edx'p`%d5
[^~9wFNtd
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 y@_?3m7B=
yscale = 2, !第二个y轴的缩放比例 RiG!TTa
b
color = magenta, w-Fk&dC69
width = 3, q/79'>`|ai
style = fdashed, caht4N{T
"n2 (%, right scale)" [hbp#I~*[
,O$C9pH9
f: 100 * n(x, 3), !n(x ,3) 函数是计算x位置处激活粒子数在能级3上的占比 KW^aARJ)
yscale = 2, IIiN1
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color = red, F-0PmO~3+W
width = 3, 5V!XD9P'
style = fdashed, taaAwTtk?A
"n3 (%, right scale)" i]pG}SJ
&S]v+wF
*`T&Dlt'8
; ------------- 7+4"+CA
diagram 2: !输出图表2 c\MDOD%9
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"Variation ofthe Pump Power" =lQ[%&
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x: 0, 10 8f5^@K\c
"pump inputpower (W)", @x DjvgKy=Jr_
y: 0, 10 HH@xnd
y2: 0, 100 8Oh3iO
frame 1s[-2^D+EM
hx yVzg<%CR^
hy S]O Hv6
legpos 150, 150 ~W{h-z%q
vyGLn
f: (set_P_in(pump, x);P_out(signal_fw)), !set_P_in(pump,x)改变泵浦信道功率;P_out(signal_fw)输出前向信号光 ZH_4'm!^g|
step = 5, cLC7U?-
color = blue, =A6O}0z
width = 3, 5N<v'6&=
"signal output power (W, leftscale)", !相应的文本字符串标签 olh3 R.M<
finish set_P_in(pump, P_pump_in) 1Z8oN3
S'p`ECfVMA
f: (set_P_in(pump,x); 100 * n_av(2)), !改变泵浦信号功率对能级2上激活粒子占比的影响 -$z " 74
yscale = 2, I]1Hi?A2
step = 5, Gi4dgMVei
color = magenta, ,8nZzVo
width = 3, @rE)xco
"population of level 2 (%, rightscale)", :=v{inN
finish set_P_in(pump, P_pump_in) ?Zp!AV
@6'E8NFl
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 HW Os@!cL
yscale = 2, uA`PZ|
step = 5, 6 <S&~q
color = red, z}&C(m:al
width = 3, 9yw/-nA
"population of level 3 (%, rightscale)", h]$?~YE
finish set_P_in(pump, P_pump_in) z>;+'>XXgx
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pF+wHMhUe
; ------------- <dPxy`_
diagram 3: !输出图表3 )'`AX\
C?|3\@7
"Variation ofthe Fiber Length" lILtxVBO2o
,!u@:UBT
x: 0.1, 5 $:
m87cR~
"fiber length(m)", @x $=xQ X
y: 0, 10 bMOM`At>z
"opticalpowers (W)", @y g~:(EO(w
frame fYM6wYJ
hx - :z5m+
hy B&