What is different between a laser beam and a flashlight?
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What is different between a laser beam and a flashlight? What are applications for laser light sources where regular light sources cannot be used?
A flashlight will emit polychromatic and unphased, (incoherent), light.
(Many wavelengths and not ‘in step’)
A lase will emit monochromatic phased, (coherent), light.
(One, (or a very narrow band of), wavelength,
and all ‘in step’.)
A laser can be focused much finer and can deliver
a very specific kind of energy to a small point.
The phased light is useful for ultra-fine distance measurement.
Reflected laser light retains its wavelength signature
and can be used for timed pulse distance measurement,
and doppler speed measurement.
To the first part lasers have a concentrated light beam(not entirely true it still spreads) and a flash light will spread at a faster rate and is not suitable for some things. a good use is for astronomers, or for making a line on a wall which can then be used to put a kitchen in level, it just requires a bit of thought, a laser is a thin point a flash light is a wide thick point
a laser beam is super thin