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112 lines
2.8 KiB
112 lines
2.8 KiB
clear all
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file='spettrolaserG3';
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str=['load ' file '.txt'];eval(str);
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str=['Ls=1e-3*' file '(:,1);'];eval(str);
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str=['spec=' file '(:,2);'];eval(str);
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file='maggio10_1557';
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str=['load ' file '.dat'];eval(str);
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str=['SHGx=' file '(:,1);'];eval(str);
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str=['SHGy=' file '(:,2);'];eval(str);
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t=(-10000:0.1:10000);% fs
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Dt=14.1; % fs
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Dw=0.441/Dt*2*pi;
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c=0.3; %micron/fs
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lambda0=0.786; %lunghezza d'onda centrale in micron
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w0=2*pi*c/lambda0;%pulsazione centrale in fs^-1
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kk=1;
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w=(2.122:5e-5*2*pi:2.75);% fs^-1
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nn=find(Ls<0.6);spec=spec-mean(spec(nn));spec=spec/max(spec);
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specI=interp1(c./Ls*2*pi,spec,w,'linear',0);
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specI2=exp(-4*log(2)*(w-w0).^2/Dw^2);
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figure(1)
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plot(w,specI,'.',w,specI2,'.')
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L=0; %micron
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% %silica
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n0=1.453;%indice di rifrazione
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d1nl=-0.01728;%derivata prima di n in lambda micron^-1
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d2nl=0.03988; %derivata seconda di n in lambda micron^-2
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d3nl=-0.2388; %derivata terza di n in lambda micron^-3
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% % BK7
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% n0=1.511;%indice di rifrazione
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% d1nl=-0.01456;%derivata prima di n in lambda micron^-1
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% d2nl=0.05589; %derivata seconda di n in lambda micron^-2
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% d3nl=-0.2877; %derivata terza di n in lambda micron^-3
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% % % CaF2
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% n0=1.4306;
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% d1nl=-0.0104;
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% d2nl=0.0304;
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% d3nl=-0.1662;
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% % Calcite ordinario
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% n0=1.6488;
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% d1nl=-0.031048300320746;
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% d2nl=0.081657209660690;
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% d3nl=-0.476683581496218;
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% % Calcite straordinario
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% n0=1.481916136599520;
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% d1nl=-0.012620442731315;
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% d2nl=0.044786681918652;
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% d3nl=-0.232969865621158;
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%
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% % Benzene
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% n0=1.485267310086479;
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% d1nl=-0.029582350419277;
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% d2nl=0.115024263003249;
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% d3nl=-0.609046368893473;
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d1nw=-lambda0^2/2/pi/c*d1nl; %derivata prima indice di rifrazione in funzione di w fs^-1
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d2nw=lambda0^3/4/pi^2/c^2*(2*d1nl+lambda0*d2nl); %derivata seconta indice di rifrazione in funzione di w fs^-2
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d3nw=-lambda0^4/8/pi^3/c^3*(6*d1nl+6*lambda0*d2nl+lambda0^2*d3nl); %derivata terza indice di rifrazione in funzione di w fs^-3
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phi0=n0*w0*L/c;
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phi1=L/c*(n0+w0*d1nw);
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phi2=L/c*(2*d1nw+w0*d2nw);
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phi3=L/c*(3*d2nw+w0*d3nw);
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dim=length(w);
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A=sqrt(specI);
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y1=t*0;
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phi=w*0;
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tic
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for i=1:1:dim
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phi(i)=0*phi0+0*phi1*(w(i)-w0)+phi2*(w(i)-w0).^2/2+phi3*(w(i)-w0).^3/6;
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y1=A(i)*cos(w(i)*t-phi(i))+y1;
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i
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end
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toc
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figure(2)
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plot(t,y1)
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shg1=4*xcorr(y1.^2,y1.^2)+1*(4*xcorr(y1.^3,y1)+4*xcorr(y1,y1.^3));
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dimt=length(t)-1;
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SHG1=shg1(dimt/2+1:dimt*3/2+1);
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% filtro
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A=fft(SHG1);
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cut=4000;
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A(cut:end-cut)=SHG1(cut:end-cut)*0;
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SHG1filter=real(ifft(A));
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figure(3)
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% plot(t,SHG1/max(SHG1),t,SHG1filter/max(SHG1filter),SHGx,SHGy)
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% plot(t,SHG1/max(SHG1)*4.5,t,SHG1filter/max(SHG1filter),'k',SHGx-0.1,SHGy,'r');xlim([-400 400])
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plot(t,SHG1filter/max(SHG1filter),'k',t,exp(-4*log(2)*t.^2/(2^0.5*Dt)^2),'b',SHGx,SHGy,'r');xlim([-400 400])
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