lasers 0.0 / 5 ? SciencePhysicsGCSEOCR Created by: chelsea toddCreated on: 16-01-16 13:48 ordinary visible light ordinary visible light is a combination of waves of different frequency and wavelegnth, that are out of phase with eachother 1 of 4 lasers produce a narrow,intense beam of monochroma what is a laser? A laser beam is just a special ray of visible light that has a few extra properties to make it special: all the waves in a laser beam are at the same frequency and the same wavelength.... this makes the light monochramatic ( produces one colour) the light waves are all in phase with eachother, producing a intence beam the waves in a laser beam are said to be coherent lasers have a low divergence- the beam is narrow and stays narrow 2 of 4 uses of lasers uses of lasers: cutting communication surgery dental light shows barcode scanners recording CDs 3 of 4 CD players use lasers to read digital information The surface of a CD has a pattern of millions of shallow pits cut into it. The areas between the pits are called lands A laser shone onto the CD is reflected from the shiny bottom surface as it spins around in the cd player The beam is reflected from a land and a pit slightly differently This difference can be picked up by a light sensor, these differences in reflected signals can be changed into electrical signals. 4 of 4
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