| 小火龙果 |
2020-05-28 16:28 |
RP Fiber Power仿真设计掺铥光纤激光器代码详解
(* '3( ^Zv Demo for program"RP Fiber Power": thulium-doped fiber laser, b]+F/@h~] pumped at 790 nm. Across-relaxation process allows for efficient ^QRg9s,T< population of theupper laser level. y~
=H`PAE *) !(* *)注释语句 d qn5G!fI
KeQcL4< diagram shown: 1,2,3,4,5 !指定输出图表 \j>7x ; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 =#b@7Yw: ; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 5G*cAlU ; 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 85GIEUvH/ ; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 )?*YrWO{ ; 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 $E\|\g RwWg:4 include"Units.inc" !读取“Units.inc”文件中内容 8-#%l~dr G21o@38e include"Tm-silicate.inc" !读取光谱数据 .w9LJ \n)',4mY ; Basic fiberparameters: !定义基本光纤参数 1PkCWRpR L_f := 4 { fiberlength } !光纤长度 2d !'9mA No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 h4?x_"V" r_co := 6 um { coreradius } !纤芯半径 DmiBM6t3N N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 rVYoxXv &7aWVKon ; Parameters of thechannels: !定义光信道 B[t^u\Fk l_p := 790 nm {pump wavelength } !泵浦光波长790nm N4!`iS Y dir_p := forward {pump direction (forward or backward) } !前向泵浦 9)q3cjP{< P_pump_in := 5 {input pump power } !输入泵浦功率5W Tu#< {'1$ w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um ):D"LC I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 i--t
?@# loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 cj/`m$ \c=I!<9 l_s := 1940 nm {signal wavelength } !信号光波长1940nm Ux[<g%F" w_s := 7 um !信号光的半径 l90mM'[ I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 X
W)TI loss_s := 0 !信号光寄生损耗为0 y>^^. Ey46JO" R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 IS bs l=F _kj]vbG^; ; 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 tMIYVHGy calc q+
$6D;9 begin 3$$E0`7. global allow all; !声明全局变量 K7+yU3 set_fiber(L_f, No_z_steps, ''); !光纤参数 +K57. n{ add_ring(r_co, N_Tm); nM
)C^$3<t def_ionsystem(); !光谱数据函数 xt{'Be&Ya+ pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 'y8{,R4C signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 'X`Z1L/ signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 rH+OXGoB set_R(signal_fw, 1, R_oc); !设置反射率函数 c7Z4u|G finish_fiber(); C|(A/b end; I2ek`t] Y?VbgOM) ; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 DDg\oGLp show "Outputpowers:" !输出字符串Output powers: ]n22+]D show"pump: ", P_out(pump):d3:"W" !输出字符串pump:和计算值(格式为3个有效数字,单位W) }I"C4'(a show"signal: ",P_out(signal_fw):d3:"W" !输出字符串signal:和计算值(格式为3个有效数字,单位W) @fL ^I&++ ou|emAV (B7G'h.? ; ------------- f^WTsh] diagram 1: !输出图表1 lo1Ui`V }{aGh I~< "Powers vs.Position" !图表名称 h~MV=7
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M: x: 0, L_f !命令x: 定义x坐标范围 nR!e( "position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 Kz4S6N c y: 0, 15 !命令y: 定义y坐标范围 <#63tN9 y2: 0, 100 !命令y2: 定义第二个y坐标范围 EP;/[O frame !frame改变坐标系的设置 v\0 G`&^1 legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) ,g`%+s7 u hx !平行于x方向网格 T5BZD
+Ta hy !平行于y方向网格 Pf?kNJ*Tv) =BsV`p7rU f: P(pump, x), !命令f: 定义函数图;P(pump, x)函数是计算x位置处的泵浦光功率
CI|lJ color = red, !图形颜色 +8=$-E= width = 3, !width线条宽度 "(koR Q "pump" !相应的文本字符串标签 Y4T") 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
$EMOz=)I# color = blue, adON&< width = 3, _B4&Fb. "fw signal" G4&s_M$ 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 ZO}Og&% color = blue, _`$LdqgE style = fdashed, e5=d
Ev width = 3, wN2+3LY{ "bw signal" yoi4w 7: N!A20Bv f: 100 * n(x, 2), !n(x ,2) 函数是计算x位置处激活粒子数在能级2上的占比 .J#'k+> yscale = 2, !第二个y轴的缩放比例 x^f<G
6z color = magenta, CU$khz" width = 3, 0MQ= Rt style = fdashed, JuRoeq. "n2 (%, right scale)" mp|pz%U kH!Z|Ps?R 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 <?jdNM yscale = 2, ~Eut_d color = red, dWY%bb width = 3, V la,avON style = fdashed, E' 5*w6 "n3 (%, right scale)" I8F+Z NGra/s,9| A 'qe2] ; ------------- gmTBT#{6yH diagram 2: !输出图表2 O--p)\ 61\u{@o$ "Variation ofthe Pump Power" #kg`rrFr St=nf\P&F x: 0, 10 gfk)`>E "pump inputpower (W)", @x a"~o'W7 y: 0, 10 T.q2tC[bR y2: 0, 100 >nSsbhAe frame KaIKb=4L| hx LvG.ocCG hy a+h$u legpos 150, 150 wNONh`b sW^M
] 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 U}v`~'K step = 5, $QX$r N color = blue, N'^>pSc4W| width = 3, xh6(~'$ "signal output power (W, leftscale)", !相应的文本字符串标签 N_t,n^i9>* finish set_P_in(pump, P_pump_in) lED!}h'4 8K8u|]i 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 ;w{<1NH2+. yscale = 2, I?KN7(9u? step = 5, D?|D)"?qb color = magenta, ~G@NWF?7 width = 3, pP\Cwo #, "population of level 2 (%, rightscale)", OY*y< | |