I_init = 11900; % intensities in uW

data = [8.2 43;
        30 45;
        100 70;
        282 117;
        360 220];
    
data(:,2) = data(:,2)./(I_init-data(:,2));
plot(data(:,1),data(:,2),'o','markersize',4);
hold on;
plot(data(:,1),data(:,2));
xlabel('Amplitude of the drive signal (V)');
ylabel('Relative intensity in the first diffracted order');
title('Diffraction efficiency vs. drive power');
