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The high speed phenomena can be analyzed in three dimensions by recording the hologram with Q switched Ruby laser,which emits a short plused beam of around 10ns(10-8seconds)@
Destruction moment of an electric light bulb Ultrashort pulsed laser hologram A light pulse of 3.3 ps has a length of only 1mm and propagates at a speed of 300,000km per second. Of course, it cannot be directly seen. Laser development has made it possible to easily obtain an ultrashort light pulse in the order of pico and femtoseconds. A light pulse of 3.3 picoseconds has a length of only 1mm and propagates at a speed of 300,000km per second. Of course, it cannot be directly seen. Moreover, unlike ordinary continuous light signals, interference between two such short pulses occurs only when they arrive at a point simultaneously. This makes it possible to obtain a time resolved recording of the object wave along the transverse axis of the hologram. This is called a glight-in-flighth recording by holography and is used as a time-gated viewing system for ultrafast phenomena. When the hologram is illuminated with continuous light wave, each different portion of the hologram reconstructs the image at a different time. Therefore, it is possible to observe a frameless, continuous motion picture of the light propagation by moving the point of observation along the hologram, as if one were riding along the light waves. @ Generation of contour lines are also possible by setting the recording arrangement properly. The following picture is one of the example showing the contour lines of electric light bulb.
Some interesting examples of light propagation through a medium
are introduced in the page "Visualization of light propagation with
a ultrashort pulsed laser" |
