Comparison To Gaussian Beam Focus
A circular laser beam with uniform intensity profile, focused by a lens, will form an Airy pattern at the focal plane of the lens. The intensity at the center of the focus will be where is the total power of the beam, is the area of the beam ( is the beam diameter), is the wavelength, and is the focal length of the lens.
A Gaussian beam with diameter of D focused through an aperture of diameter D will have a focal profile that is nearly Gaussian, and the intensity at the center of the focus will be 0.924 times .
Read more about this topic: Airy Disk
Famous quotes containing the words comparison, beam and/or focus:
“Envy and jealousy are the private parts of the human soul. Perhaps the comparison can be extended.”
—Friedrich Nietzsche (1844–1900)
“Why beholdest thou the mote that is in thy brother’s eye, but considerest not the beam that is in thine own eye?”
—Bible: New Testament Jesus, in Matthew, 7:3.
From the Sermon on the Mount.
“If your child is going to develop a healthy personality with the capacity to remain intact and grow, she must learn how to test reality, regulate her impulses, stabilize her moods, integrate her feelings and actions, focus her concentration and plan.”
—Stanley I. Greenspan (20th century)