(* c\ l kD-\
Demo for program"RP Fiber Power": thulium-doped fiber laser, ?<'}r7D
pumped at 790 nm. Across-relaxation process allows for efficient "1M[5\Ax
population of theupper laser level. ;;N9>M?b
*) !(* *)注释语句 ^ (zYzd
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diagram shown: 1,2,3,4,5 !指定输出图表 |8tilOqI
; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 }Kbb4]t|"
; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 *CI#+P
; 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 | h#u^v3
; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 81
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; 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 '$%l7
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include"Units.inc" !读取“Units.inc”文件中内容 iqQD{SRt{
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include"Tm-silicate.inc" !读取光谱数据 ?2Py_gkf
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; Basic fiberparameters: !定义基本光纤参数 P\rg"
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L_f := 4 { fiberlength } !光纤长度 UrEs4R1#
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 vnZC,J `
r_co := 6 um { coreradius } !纤芯半径 !."D]i;
N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 7! INkH]
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; Parameters of thechannels: !定义光信道 q'Tf,a
l_p := 790 nm {pump wavelength } !泵浦光波长790nm q9r[$%G
dir_p := forward {pump direction (forward or backward) } !前向泵浦 3m!X/u
P_pump_in := 5 {input pump power } !输入泵浦功率5W n[Y~]
w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um .jjG(L
I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 A*547=M/(j
loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 ;u46Z
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l_s := 1940 nm {signal wavelength } !信号光波长1940nm >jc [nk
w_s := 7 um !信号光的半径 pJ'"j 6Q
I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 0[?Xxk}s0
loss_s := 0 !信号光寄生损耗为0 fSvM(3Y<Qh
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R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 9 X`Sm}i
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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 @>Km_Ax
calc 3K0A)W/YEs
begin 5f K_Aq{
global allow all; !声明全局变量 _H7x9
y=
set_fiber(L_f, No_z_steps, ''); !光纤参数 PmEsN&YP]
add_ring(r_co, N_Tm); Zw
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def_ionsystem(); !光谱数据函数 EDl!w:
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 V#gK$uv
signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 ^KT Y?
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 !9VY|&fHe
set_R(signal_fw, 1, R_oc); !设置反射率函数 rlSeu5X6
finish_fiber(); Vd+T$uC
end; O^duZ*b
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; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 ,G?WAOy,
show "Outputpowers:" !输出字符串Output powers: E,x+JeKV
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) `%9 uE(
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) TpwkD_fg
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; ------------- [uN?
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diagram 1: !输出图表1 u(F_oZ~
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"Powers vs.Position" !图表名称 fW1CFRHH
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x: 0, L_f !命令x: 定义x坐标范围 }?_?V&K|
"position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 ,77d(bR<
y: 0, 15 !命令y: 定义y坐标范围 w(3G&11N?
y2: 0, 100 !命令y2: 定义第二个y坐标范围 yfjWbW
frame !frame改变坐标系的设置 ?(F6#"/E
legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) j[G
hx !平行于x方向网格 17"uf.G
hy !平行于y方向网格 VSI9U3t3w
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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 S3*`jF>q
color = red, !图形颜色 tOd&!HYL
width = 3, !width线条宽度 _P 3G
"pump" !相应的文本字符串标签 lc1(t:"[
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 hPkWCoQpq
color = blue, }"P|`"WW
width = 3, &4x}ppX
"fw signal"
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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 7p16Hv7y~
color = blue, 5o'FS{6U
style = fdashed, RVA(Q[ ;
width = 3, c&?m>2^6
"bw signal" l<LP&
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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 %i9E @EV
yscale = 2, !第二个y轴的缩放比例 RSyUaA
color = magenta, %G/hD
width = 3, K6/Q}W
style = fdashed, )D5"ap]fX
"n2 (%, right scale)" u=?.}Pj
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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 Fg5kX
yscale = 2, ~"&|W'he[
color = red, 2Aazy'/
width = 3, v6M6>&RR|
style = fdashed, t~EPn.
"n3 (%, right scale)" Vvn2 Ep
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; ------------- k"T}2 7
diagram 2: !输出图表2 wOEj)fp.
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"Variation ofthe Pump Power" V6&!9b
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x: 0, 10 l|~A#kq
"pump inputpower (W)", @x \K{0L
y: 0, 10 UXc-k
y2: 0, 100 ug!s7fo^
frame 7$vYo
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hx Pw7]r<Q
hy nQX:T;WL@
legpos 150, 150 q77;ZPfs8
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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 1EO7H{E=
step = 5, 8>2.UrC
color = blue, b8`)y<