Complete working and application of laser:-
LASER is acronym for the Light Amplification by Stimulated Emission of Radiation.
Lasers are actually a device that amplify and radiate coherent light beams.This coherent beam propagates in step with one after another, due to this highly directional property of laser beam , makes them extremely useful as alignment.This type of laser beams device works in low power at less then 1mw and it safe to use because of low power.An ordinary sun light is composed of seven colors and each color has different wavelength, this light is when fallen on the prism, it splits in to seven colors, you can also see splitting of sun light in to seven colors light in rainbow, so sun light have seven colors, but in lasers light it has a single wavelength which travels in straight line.
This wavelength can be detected, or intercepted by position-sensing detectors (PSDs).
When laser spot is detected by PSDs, it is converted in to electrical signal according to its location on the target. This obtained signal is converted in to calibrated reading by computers to detect laser beam.
There are two methods to create laser, a gain medium and resonant optical cavity.
In gain medium crystals, glasses, gas and some semi conductor are used.This gain medium is excited by the electrical energy or through another laser beacause lasers also contain energy.After certain point named as population inversion, shining light through the medium is emitted due to releasing of energy.
In resonant optical cavity, a special chamber like box with mirror at the one end and semi silver on other side is used. Light entering to this chamber get trapped due to the reflected walls of chamber results acquiring more energy, after certain point it becomes saturated and this is called saturation point, after that it emits radiation of certain wavelength depending on the nature of medium.
There are two types of lasers one is continuous and second is pulse type. Continuous type is more powerful than pulse and much used in many applications but power of pulse type is much more than continuous.
To divert beams, you should note one thing that degree of rotation is inversely proportional to the diameter of beam, smaller beams diverges more faster than the beam of larger diameter.
The first time when a scientist named Bell, presented this theory in 1960. it was not immediately implemented on applications although nuclear fusion, radar were discussed as areas of interests.
But now a days laser technology is in every field of science like in laser cutting, in medical, holography and even in nuclear fusion.
Safety Measures:-
Laser are classified in to different classes based on their damage.
Class 1: inherently safe becaued the light is contained in an enclosure, like in CD players.
Class 2: safe during normal use because of less power like in laser pointers.
Class 3R: can have small risk of eye damage due to more power may be up to 5 mW
Class 3B: can damage the eye sight.
Class 4: can even burn skin.
Last words:-
Lasers have really taken over the imaginations of people, ever for those who are not interested in science related stuff, according to me when less are known the concept of figuring out fantastical ideas for how to make lasers were even interesting to me as electrical engineer.
LASER is acronym for the Light Amplification by Stimulated Emission of Radiation.
Lasers are actually a device that amplify and radiate coherent light beams.This coherent beam propagates in step with one after another, due to this highly directional property of laser beam , makes them extremely useful as alignment.This type of laser beams device works in low power at less then 1mw and it safe to use because of low power.An ordinary sun light is composed of seven colors and each color has different wavelength, this light is when fallen on the prism, it splits in to seven colors, you can also see splitting of sun light in to seven colors light in rainbow, so sun light have seven colors, but in lasers light it has a single wavelength which travels in straight line.This wavelength can be detected, or intercepted by position-sensing detectors (PSDs).
When laser spot is detected by PSDs, it is converted in to electrical signal according to its location on the target. This obtained signal is converted in to calibrated reading by computers to detect laser beam.
There are two methods to create laser, a gain medium and resonant optical cavity.
In gain medium crystals, glasses, gas and some semi conductor are used.This gain medium is excited by the electrical energy or through another laser beacause lasers also contain energy.After certain point named as population inversion, shining light through the medium is emitted due to releasing of energy.In resonant optical cavity, a special chamber like box with mirror at the one end and semi silver on other side is used. Light entering to this chamber get trapped due to the reflected walls of chamber results acquiring more energy, after certain point it becomes saturated and this is called saturation point, after that it emits radiation of certain wavelength depending on the nature of medium.
There are two types of lasers one is continuous and second is pulse type. Continuous type is more powerful than pulse and much used in many applications but power of pulse type is much more than continuous.
To divert beams, you should note one thing that degree of rotation is inversely proportional to the diameter of beam, smaller beams diverges more faster than the beam of larger diameter.
The first time when a scientist named Bell, presented this theory in 1960. it was not immediately implemented on applications although nuclear fusion, radar were discussed as areas of interests.
But now a days laser technology is in every field of science like in laser cutting, in medical, holography and even in nuclear fusion.
Safety Measures:-
Laser are classified in to different classes based on their damage. Class 1: inherently safe becaued the light is contained in an enclosure, like in CD players.
Class 2: safe during normal use because of less power like in laser pointers.
Class 3R: can have small risk of eye damage due to more power may be up to 5 mW
Class 3B: can damage the eye sight.
Class 4: can even burn skin.
Last words:-
Lasers have really taken over the imaginations of people, ever for those who are not interested in science related stuff, according to me when less are known the concept of figuring out fantastical ideas for how to make lasers were even interesting to me as electrical engineer.
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