Follow

Modern Optics

  • L1-31: LASER LIGHT CAVITY

    L1-31
    Demonstrate how a laser cavity works.
    The laser beam enters the cavity through a hole in the mirror nearest the laser. The mounts are then adjusted to reflect the laser beam back and forth between the two mirrors. Using curved mirrors with long focal length the beam is seen to walk around the mirrors in an elliptical path. Use vapor from blowing across liquid nitrogen or a very small amount of chalk dust to make the beam visible.
  • L1-32: VISIBLE LASER

    L1-32
    Show what the inside of a laser looks like, and to show that the laser removes lots of spectral components from the light in the tube and only lets one wavelength out.
    The metal cover has been removed from a weak helium-neon laser, allowing the internal components to be seen, including the tube and the mirrors. Using a hand-held diffraction grating the light from in the tube can be seen to have a large number of spectral components. The light outside hits a white screen; looking at the spot with the grating shows that it is monochromatic, illustrating the lasing action.
  • M6-01: HOLOGRAM - LASER LIGHT - VOLKSWAGEN

    M6-01
    View a laser light hologram.
    The hologram, in the form of a slowly rotating cylinder, is illuminated from inside as illustrated by either a white light with a red plastic filter (photograph in center) or a laser light scattered by a piece of wax paper (photograph at right). The laser light renders better resolution of the hologram details, but this is obscured in the photograph by the laser speckle.
    M6, LS1

    m6-01am6-01b

     

  • M6-02: HOLOGRAM - LASER LIGHT - THE SCIENTIST

    M6-02
    View a laser light hologram.

    The hologram, a clear glass plate, is illuminated from a distance of less than a meter by a laser beam that has been diverged by scattering through a piece of wax paper. The laser beam strikes the hologram perpendicular to the plate. The proper view is seen by observing transmitted light at an angle on one side of the laser axis. However, if you view reflected light or look at the laser at a different angle (opposite the axis of the laser beam) the hologram appears backwards or upside down! Go figure that one out.

    M6, FS1

    m6-02a

     

  • M6-03: HOLOGRAM - LASER LIGHT - MISC INDIVIDUAL VIEWING

    M6-03
    View laser light holograms individually.
    A collection of laser light holograms is available for individual viewing. Many are quite fascinating.
  • M6-11: HOLOGRAM - MULTIPLEX - BASEBALL

    M6-11
    Rotating 360 degree multiplex hologram.
    The hologram, lit by a clear long-filament bulb in the spherical base, shows motion of the ball players as the frame rotates. This is a neat gizmo, and really gets the attention of young children.
  • M6-12: HOLOGRAM - MULTIPLEX - THE KISS

    M6-12
    Walk-by multiplex hologram.
    As you walk by the hologram from left to right, the woman in the photograph throws you a kiss and winks at you. This is a neat gizmo, and really gets the attention of older males. The photographs above show the hologram near the beginning and the end while walking across from left to right.

    m6-12a

     

  • M6-13: HOLOGRAM - MULTIPLEX - KING KONG

    M6-13
    Walk-by multiplex hologram.
    King Kong is standing by the skyscraper as the airplane flies by. As you walk by the hologram from left to right, King Kong grabs the airplane in his hand.
  • M6-21: HOLOGRAM - REFLECTION - MARCHING BAND

    M6-21
    White light reflection hologram.
    The light in the foreground illuminates the hologram, which can be rotated in place on its mount. As it is rotated the rear marching band members move behind the front ones and come out the other side!

    m6-21am6-21b

     

  • M6-22: HOLOGRAM - REFLECTION - ORRERY

    M6-22
    White light reflection hologram.

    The hologram is mounted at an angle and illuminated from above by a bright point source. It includes the configuration of the planets on April 26, 1832 and December 31, 1999. Why did they choose these dates?

    Laplace, who invented the orrery, had an interesting exchange with Napolean when he presented one of his devices to the emporer. Napolean examined his orrery and stated, "How can this be! You made the system of the world, you explain the laws of all creation, but in all your book you speak not once of the existence of God!" Laplace responded, "[No, Sire,] I had no need of that hypothesis." See Wikiquote for further information and other translations.

    The photographs above show the set of three white light holograms on a single stand with close-ups of the two scenes of the orrery hologram as described above.

    m6-22am6-22b

     

  • M6-23 HOLOGRAM - REFLECTION - OWLS

    M6-23
    White light reflection hologram
    The hologram is mounted at an angle and illuminated from above by a bright point source. It includes three really sweet baby owls peering out of their nest.
  • M6-24: HOLOGRAM - REFLECTION - WEREWOLF

    M6-24
    White light reflection hologram.

    The hologram is mounted at an angle and illuminated from above by a bright point source. It includes three successive views of a really ugly man turning into a really scary werewolf. Don't let your young children see this one.

    The photographs above show the display setup with three white light holograms and close-ups of two scenes from the werewolf hologram.

    m6-24am6-24b