m = 1
nm = 1e-9 * m
mm = 1e-3 * m
cm = 1e-2 * m
wavelength = 550 * nm
size = 5 * mm
N = 150
R = 0.12 * mm
x = 0.5 * mm
y = 0.25 * mm
z = 5 * cm
F = Field(N, size, wavelength)
F2 = F.copy()
F3 = F.copy()
F.circular_aperture(R, -x, -y)
F2.circular_aperture(R, x, -y)
F3.circular_aperture(R, 0, y)
F.value[:] = F.value + F2.value + F3.value
del F2, F3
for l in xrange(1, 11):
F.forvard(z)
subplot(2, 5, l)
imshow(abs(F.value)**2)
xticks([]), yticks([])
title('z={z} cm'.format(z=(l * z / cm)))
show()
from lightpipes import Field
from pylab import *
m = 1
nm = 1e-9 * m
mm = 1e-3 * m
cm = 1e-2 * m
wavelength = 550 * nm
size = 5 * mm
N = 300
R = 0.12 * mm
d = 0.5 * mm
z = 5 * cm
F = Field(N, size, wavelength)
F2 = F.copy()
F.circular_aperture(R, d, 0)
F2.circular_aperture(R, -d, 0)
F.value[:] = F.value + F2.value
del F2
for l in xrange(1, 11):
F.forvard(z)
subplot(2, 5, l)
imshow(abs(F.value)**2)
xticks([]), yticks([])
title('z={z} cm'.format(z=(l * z / cm)))
show()
#!/usr/bin/env python """ LightPipes for Python Optical Toolbox Calculates the Fraunhofer diffraction of a round hole. """ import common from lightpipes import Field from pylab import * m = 1 nm = 1e-9 * m mm = 1e-3 * m cm = 1e-2 * m wavelength = 1000 * nm size = 10 * cm N = 150 R = 10 * mm z = 1000 * m f1 = 200 * m f2 = -200 * m F = Field(N, size, wavelength) F.circular_aperture(R) F.lens(f1) F.lens_forvard(f2, z) imshow(abs(F.value)**2) # plot intensity show()
x = y = grid_dx * r_[-255.5:256:1.] [xx, yy] = meshgrid(x,y) torus_phase = tlens(xx,yy,R0,f_torus,wavelength) + phase_ring(xx,yy,R1,w1) propagate = Propagate() #print 'press enter to continue' #propagate.imshow( torus_phase ) #raw_input() # propagate the field from the SLM and take a look F = Field( N, side_length, wavelength) # initial field F.gaussian_aperture(w) # gaussian input F.circular_aperture(side_length/2.) # Iris in front of SLM F.value[:] *= exp(1j * torus_phase ) # apply SLM phase F.forvard(f_torus) propagate(F, z=f_torus, dz=f_torus/25.) print 'press enter to show final phase...' raw_input() propagate.imshow( angle(F.value) ) print 'press enter to show final intensity...' raw_input() propagate.imshow( (F.value * F.value.conj()).real ) print 'press enter to exit' raw_input()
