clc;
clear;
close all;
% Constants and parameters
lambda_sh = 0.775e-6; % SH wavelength
nlithium_sh = 2.1784;
lambda_ff = 1.55e-6; % FF wavelength
nlithium_ff = 2.1376;
L = 1; % Length in some units, assuming meters
% Wave numbers
k_sh = (2 * pi / lambda_sh) * nlithium_sh;
k_ff = (2 * pi / lambda_ff) * nlithium_ff;
% Define the range of Delta_k*L/pi to evaluate the sinc-squared function
delta_kL_over_pi = linspace(-20, 120, 10000); % For a smooth curve
Delta_k = delta_kL_over_pi * pi / L;
% Calculate the sinc-squared function
E3 = sinc(Delta_k / (2*pi)).^2;
% Plotting
figure;
semilogy(delta_kL_over_pi, E3, 'LineWidth', 2);
xlabel('\Delta k L/\pi');
ylabel('Relative Efficiency |g|^2');
title('Second Harmonic Generation Efficiency');
grid on; % Adding grid for better readability
axis tight; % Remove extra white space in the plot
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