diff options
Diffstat (limited to 'compass_lin_extrema_vs_theta.m')
| -rw-r--r-- | compass_lin_extrema_vs_theta.m | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/compass_lin_extrema_vs_theta.m b/compass_lin_extrema_vs_theta.m new file mode 100644 index 0000000..1c90f8c --- /dev/null +++ b/compass_lin_extrema_vs_theta.m @@ -0,0 +1,155 @@ +1; +clear all; +t0 = clock (); % we will use this latter to calculate elapsed time + + +% load useful functions; +useful_functions; + +% some physical constants +useful_constants; + +basis_transformation; % load subroutines + +% load atom energy levels and decay description +rb87_D1_line; +%four_levels_with_polarization; +%four_levels; +%three_levels; +%two_levels; + +% load EM field description +field_description; + +%Nfreq=length(modulation_freq); + + + +%tune probe frequency +detuning_p=0; +N_detun_steps=100; +%detuning_p_min=-B_field*gmg*4; % span +/-4 Zeeman splitting +%detuning_p_max=-detuning_p_min; +detuning_freq=zeros(1,N_detun_steps+1); +kappa_p =zeros(1,N_detun_steps+1); +kappa_m =zeros(1,N_detun_steps+1); +%detun_step=(detuning_p_max-detuning_p_min)/N_detun_steps; + +fprintf (stderr, "calculating atom properties\n"); +fflush (stderr); +% calculate E_field independent properties of the atom +% to be used as sub matrix templates for Liouville operator matrix +[L0m, polarizability_m]=L0_and_polarization_submatrices( ... + Nlevels, ... + H0, g_decay, g_dephasing, dipole_elements ... + ); +elapsed_time = etime (clock (), t0); +fprintf (stderr, "elapsed time so far is %.3f sec\n",elapsed_time); +fflush (stderr); + +global atom_properties; +atom_properties.L0m=L0m; +atom_properties.polarizability_m=polarizability_m; +atom_properties.dipole_elements=dipole_elements; + +%Ed=.1; Edc=conj(Ed); +%Ep=0.8*Ed; Epc=conj(Ep); + +%light_positive_freq = [wp, wd, wp-wd]; +E_field_drive = [0 , Ed, 0 ]; +E_field_probe = [Ep, 0 , 0 ]; +E_field_zero = [0 , 0 , 0 ]; +E_field_lab_pos_freq.linear = E_field_zero + (1.00000+0.00000i)*E_field_probe + (1.00000+0.00000i)*E_field_drive; +%E_field_lab_pos_freq.right = E_field_zero + (0.00000+0.00000i)*E_field_probe + (0.00000+0.00000i)*E_field_drive; +%E_field_lab_pos_freq.left = E_field_zero + (0.00000+0.00000i)*E_field_probe + (0.00000+0.00000i)*E_field_drive; + + +% phi is angle between linear polarization and axis x +phi=pi*2/4; +% theta is angle between lab z axis (light propagation direction) and magnetic field axis (z') +theta=pi/2; +%theta=65/180*pi; + +%small ellipticity angle psi (0 to pi/2) +% 0 will give linear polarization +% pi/4 circular polarization +%psi_el=pi/4; +%psi_el=.2*pi/4; +psi_el=0.0*pi/4; + + + + + +fprintf (stderr, "tuning laser in forloop to set conditions vs detuning\n"); +fflush (stderr); + +detuning_freq=[-.075, -.05, -.025, 0 , .025, .05 , .075, .1]; + +problem_cntr=1; +N_angle_steps=31; +min_angle=0; max_angle=pi; +thetas=min_angle:((max_angle-min_angle)/N_angle_steps):max_angle; +for theta=thetas; + for detuning_p_cntr=1:length(detuning_freq); + + wp0=w_pf1; + wd=w_pf1-w_hpf_ground; + detuning_p=detuning_freq(detuning_p_cntr); + wp=wp0+detuning_p; + wm=wd-(wp-wd); + + light_positive_freq=[ wp, wd, wp-wd]; + % we define light as linearly polarized along x + E_field_lab_pos_freq.x = E_field_lab_pos_freq.linear; + E_field_lab_pos_freq.y = 0; + % now we add small elasticity + E_field_lab_pos_freq.y=sin(psi_el)*E_field_lab_pos_freq.x*(1i); % order is important + E_field_lab_pos_freq.x=cos(psi_el)*E_field_lab_pos_freq.x; + % set phi angle between light polarization and axis x + [E_field_lab_pos_freq.x, E_field_lab_pos_freq.y] = rotLinPolarization(phi, E_field_lab_pos_freq.x, E_field_lab_pos_freq.y); + E_field_lab_pos_freq.z=E_field_zero; + + + % now we transfor x,y,z, to x',y', and z' with respect to magnetic field az z' axis + E_field_pos_freq=xyz_lin2atomic_axis_polarization(theta, E_field_lab_pos_freq); + + % we calculate dc and negative frequencies as well as amplitudes + [modulation_freq, E_field] = ... + light_positive_frequencies_and_amplitudes2full_set_of_modulation_frequencies_and_amlitudes(... + light_positive_freq, E_field_pos_freq); + + freq_index=freq2index(wp,modulation_freq); + + atom_field_problem.E_field = E_field; + atom_field_problem.modulation_freq = modulation_freq; + atom_field_problem.freq_index = freq_index; + + problems_cell_array{problem_cntr}=atom_field_problem; + problem_cntr++; + + + %kappa_p(detuning_p_cntr)=susceptibility_steady_state_at_freq( atom_field_problem); + endfor +endfor + +save '/tmp/problem_definition.mat' problems_cell_array atom_properties detuning_freq theta; +fprintf (stderr, "now really hard calculations begin\n"); +fflush (stderr); +% once we define all problems the main job is done here +%kappa_p=cellfun( @susceptibility_steady_state_at_freq, problems_cell_array); +%kappa_p=parcellfun(2, @susceptibility_steady_state_at_freq, problems_cell_array); +%[xi_linear, xi_left, xi_right]=parcellfun(2, @susceptibility_steady_state_at_freq, problems_cell_array); +% strangely parcell is slower than cellfun 20 seconds vs 29 +%total_relative_transmission_vs_phi=parcellfun(2, @total_relative_transmission, problems_cell_array); +total_relative_transmission=cellfun(@total_relative_transmission, problems_cell_array); + +%save 'xi_vs_detuning.mat' detuning_freq xi_linear xi_left xi_right ; +problem_cntr--; +save '/tmp/total_relative_transmission_vs_theta.mat' detuning_freq total_relative_transmission thetas problem_cntr; + +compass_lin_extrema_vs_theta_output_results; + +elapsed_time = etime (clock (), t0) + +% vim: ts=2:sw=2:fdm=indent |