(* ndCS<ojcBP
Demo for program"RP Fiber Power": thulium-doped fiber laser, }DUDA%U
pumped at 790 nm. Across-relaxation process allows for efficient 1=q?#PQ
population of theupper laser level. 5KH'|z
*) !(* *)注释语句 mZ5K hPvf8
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diagram shown: 1,2,3,4,5 !指定输出图表 MMA@J
; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 H+#wj|,+\
; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 n 8OdRv
; 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 b
gc<)=
; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 ;&^"q{m
; 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 QV
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include"Units.inc" !读取“Units.inc”文件中内容 >ya-
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include"Tm-silicate.inc" !读取光谱数据 3JE;:2O~P
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; Basic fiberparameters: !定义基本光纤参数 4Ig{#}<
L_f := 4 { fiberlength } !光纤长度 bq6{ty"
No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 5WNg+
r_co := 6 um { coreradius } !纤芯半径 ah Xq{>
N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 ]qza*ba
6% y)
; Parameters of thechannels: !定义光信道 "0 PN
l_p := 790 nm {pump wavelength } !泵浦光波长790nm uF3p1by
dir_p := forward {pump direction (forward or backward) } !前向泵浦 5B.??;xtaV
P_pump_in := 5 {input pump power } !输入泵浦功率5W ])wMUJWg2
w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um ]o+|jgkt]
I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 9]F&Fz/G
loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 yg[;
@[b:([
l_s := 1940 nm {signal wavelength } !信号光波长1940nm OO
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w_s := 7 um !信号光的半径 '=b&)HbeK
I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 OI}HvgV^!
loss_s := 0 !信号光寄生损耗为0 :kx#];2i
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R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 u4+uGYr*@
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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 g+/U^JIc4l
calc 2V"gqJHv
begin .@3u3i64'
global allow all; !声明全局变量 F Hcqu_;J
set_fiber(L_f, No_z_steps, ''); !光纤参数 g~H?l3v
add_ring(r_co, N_Tm); u[|S*(P
def_ionsystem(); !光谱数据函数 *4^]?Y\*
pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 LLHOWD C(2
signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 |ShRxE3@'
signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 dVt@D&
set_R(signal_fw, 1, R_oc); !设置反射率函数 JiLrwPex[
finish_fiber(); :=7 '1H
end; R:R@sU
)* nbEZm@
; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 Qn3+bF4
show "Outputpowers:" !输出字符串Output powers: J o(}#_y?
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) 'C>S yU
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) RH4n0=2
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; ------------- :(p
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diagram 1: !输出图表1 r=||sZs
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"Powers vs.Position" !图表名称 fvM3.P
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x: 0, L_f !命令x: 定义x坐标范围 RF2XJJ
"position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 /aa;M*Qp
y: 0, 15 !命令y: 定义y坐标范围 L0VR(
y2: 0, 100 !命令y2: 定义第二个y坐标范围 v
4b`19}
frame !frame改变坐标系的设置 HPdwx
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legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) &