| 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
(* lN@o2QX Demo for program"RP Fiber Power": thulium-doped fiber laser, kmW4:EA% pumped at 790 nm. Across-relaxation process allows for efficient )GpK@R]{ population of theupper laser level. vaLSH
xi *) !(* *)注释语句 7dWS K0~rN.C!0 diagram shown: 1,2,3,4,5 !指定输出图表 Tk}]Gev ; 1: "Powersvs. Position" !分号是注释;光纤长度对功率的影响 A^g(k5M* ; 2:"Variation of the Pump Power" !泵浦光功率变化对信号输出功率的影响 8LKiS ; 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 F8=+j_UGI ; 4:"Transverse Profiles" !横向分布,横坐标为半径位置 LV Ge]lD ; 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 2G7Wi!J .A|udZ, include"Units.inc" !读取“Units.inc”文件中内容 'L'R9&o<X as|<}:V include"Tm-silicate.inc" !读取光谱数据 4Z*/WsCv sRs>"zAg ; Basic fiberparameters: !定义基本光纤参数 %J(:ADu] L_f := 4 { fiberlength } !光纤长度 e
,(mR+a8 No_z_steps := 50 {no steps along the fiber } !光纤步长,大括号{ }是注释,相当于备注 _>+Ld6.T6 r_co := 6 um { coreradius } !纤芯半径 ~ljXzD93Z N_Tm := 100e24 { Tmdoping concentration } !纤芯Tm离子掺杂浓度 fhiM U8(& Ui~>SN>s ; Parameters of thechannels: !定义光信道 54T`OE
= l_p := 790 nm {pump wavelength } !泵浦光波长790nm Hl"N} dir_p := forward {pump direction (forward or backward) } !前向泵浦 (QEG4&9 P_pump_in := 5 {input pump power } !输入泵浦功率5W 0mE 0 j w_p := 50 um {radius of pump cladding } !包层泵浦相应的半径 50um [0!( xp^ I_p(r) := (r <=w_p) { pump intensity profile } !泵浦光强度分布 %b$>qW\*& loss_p := 0 {parasitic losses of pump wave } !泵浦光寄生损耗为0 ZK,G v B#A6v0Ta l_s := 1940 nm {signal wavelength } !信号光波长1940nm |Cv!,]9:r w_s := 7 um !信号光的半径 @d'j zs I_s(r) := exp(-2 *(r / w_s)^2) !信号光的高斯强度分布 XFl6M~ c loss_s := 0 !信号光寄生损耗为0 WWY6ha ytImB`'\ R_oc := 0.70 {output coupler reflectivity (right side) } !输出耦合反射率 Txu/{M, $Sq:q0 ; Function for defining themodel: !定义模型函数,一定要有calc命令,否则函数只会被定义,但不会被执行 |yCMt:Hk calc -?\D\\+t begin J.a]K[ci global allow all; !声明全局变量 *dQSw)R set_fiber(L_f, No_z_steps, ''); !光纤参数 rI\FI0zIp_ add_ring(r_co, N_Tm); 9up3[F$ def_ionsystem(); !光谱数据函数 &C}*w2]0S pump := addinputchannel(P_pump_in, l_p,'I_p', loss_p, dir_p); !泵浦光信道 4#D,?eA7 signal_fw := addinputchannel(0, l_s, 'I_s',loss_s, forward); !前向信号光信道 /ZX}Nc g signal_bw := addinputchannel(0, l_s, 'I_s',loss_s, backward); !后向信号光信道 hN_]6,<\ set_R(signal_fw, 1, R_oc); !设置反射率函数 \fOEqe*5SM finish_fiber(); [^iN}Lz end; -"x$ZnHU )%TmAaj9d ; Display someoutputs in the Output window (on the right side): !在Output aera区域显示输出 z{q`G wW show "Outputpowers:" !输出字符串Output powers: CIWO7bS 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) Qs!5<)6
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) W?&%x(6M Pz7XAcPQ( 4g/dP^ ; ------------- ?,/ }`3Vw diagram 1: !输出图表1 :FF=a3/"6 Wwo0%<2y "Powers vs.Position" !图表名称 u8^lB7!e/ [E_9V%^ x: 0, L_f !命令x: 定义x坐标范围 l/D}
X "position infiber (m)", @x !x轴标签;@x 指示这些字符串沿坐标轴放置 )J |6 -C y: 0, 15 !命令y: 定义y坐标范围 Z+SRXKQ y2: 0, 100 !命令y2: 定义第二个y坐标范围 hH.G#-JO frame !frame改变坐标系的设置 x`s>*^ legpos 600, 500 !图行在图表窗口中的位置(相对于左上角而言) 6)J#OKZ hx !平行于x方向网格 [g,}gyeS( hy !平行于y方向网格 \8tsDG(1 ' +ZYn? #IQ 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 ]e3Ax(i) color = red, !图形颜色 =4!mAo} width = 3, !width线条宽度 `cO:<^% "pump" !相应的文本字符串标签 gw(z1L5
n 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 %O<BfIZ color = blue, 1C.VnzRnJ width = 3, WIOV2+ "fw signal" _F{C\} 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 2%1hdA< color = blue, a*;b^Ze`v style = fdashed, I fir ,8 width = 3, s2?&! "bw signal" @HW*09TG hZ3bVi)L\ 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 ysN3 yscale = 2, !第二个y轴的缩放比例 9mgIUjz color = magenta, G3]4A&h9v~ width = 3, 0(Ij%Wi, style = fdashed, eyaNs{TV "n2 (%, right scale)" w!CNRtM:~ GILfbNcd 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 $kgVa^ yscale = 2, -&f$GUTJ color = red, (hsl~Jf width = 3, ^aQ"E9 style = fdashed, K,]=6Rj "n3 (%, right scale)" j pOp. =;k|*Ny .hiSw ; ------------- J1kM\8%b\ diagram 2: !输出图表2 5f /`Q e)ZUO_Q$ "Variation ofthe Pump Power" +(*DT9s+ a?.=V x: 0, 10 _wcNgFx "pump inputpower (W)", @x H]!"Zq k y: 0, 10 h![#;>( y2: 0, 100 .543N<w frame ^{{ qV hx l,:F hy Qd6F H2Pl legpos 150, 150 +V+a4lU14 d3Rw!slIq 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 Fi1@MG5$2 step = 5,
5IN(|B0 color = blue, -8Xf0_ width = 3, -N@|QK> "signal output power (W, leftscale)", !相应的文本字符串标签 n(Uyz`qE finish set_P_in(pump, P_pump_in) SaCh
7 ^ aT<q=DO f: (set_P_in(pump,x); 100 * n_av(2)), !改变泵浦信号功率对能级2上激活粒子占比的影响 M;NX:mX9 yscale = 2, Ie^l~Gb step = 5, H-%v3d>3 color = magenta, GL JMP^p width = 3, mTh]PPo "population of level 2 (%, rightscale)", Ah<+y\C finish set_P_in(pump, P_pump_in) C7vxw-o|&p Tr|JYLwF f: (set_P_in(pump,x); 100 * n_av(3)), !改变泵浦信号功率对能级3上激活粒子占比的影响 P$sxr yscale = 2, @6d[=!9 step = 5, 8_tQa^.n\ color = red, S$k&vc(0 width = 3, Wf<LR3 "population of level 3 (%, rightscale)", *dF>_F finish set_P_in(pump, P_pump_in) qNr}
\J| a>)f=uS i&k7-< ; ------------- to\Ni~a& diagram 3: !输出图表3 -DCbko qVPeB,kIz "Variation ofthe Fiber Length" 8D].MI^ 4~=l}H>& x: 0.1, 5 ~v83pu1!2s "fiber length(m)", @x Th[dW< | |