laser beam in our life uses and applications 3281 by raja raja varma

8/3/2019 Laser Beam in Our Life Uses and Applications 3281 by RAJA RAJA VARMA

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LASER APPLICATIONS

BY:-BHARATH K.L


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Outline

1. Introduction

2. Laser in Science & Industry

3. Laser in Telecommunication

4. Laser in Medical treatment5. Conclusion


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Laser beam is a powerful, narrow,

monochromatic and directional beam

of electromagnetic radiation.

Laser beams are within the visible

spectrum of light.

A laser device excites the atoms in a

lasing medium.

The electrons of these atoms move to a

higher orbit, then release photons,

creating a laser beam.

Introduction


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Laser in Science & Industry

Lasers are used in Science and industry

in a huge variety of applications. These

applications are uncountable.


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Laser in Science & Industry

Astronomy, Geography, and Surveying

Measuring Distances with Lasers

Drilling and Burning Holes with Light

Welding and Cutting with Lasers

Fighting Crime with Lasers


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CD Players

The detection of the binary data stored on the

compact disc.

It is done with the use of a semiconductor laser.

Diameter of about 0.8 mm at the bottom of the

disc.

1.7 micrometers passes through the clear

plastic to strike the reflective layer.

The reflected laser will be detected by a

photodiode.

CD

DVD

Blu-Ray


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Structure of CD

length = 5 km .

total number of pits more than 2 Billion .

width of each pit = 0.6 mm.

length of each pit = 0.83 to 3.05 mm.

depth of each pit = 0.11 mm.

distance between adjacent tracks = 1.6 mm.

density of tracks = 16,000 TPI

The wavelength of the Diode laser reading the CD =780 nm.

The spot size of the beam on the reflecting surface

of the CD = 1 mm.


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Bar code Reader

Bar code is used for identifying specific

items in many applications such as:

Inventory items in a storage, market, etc.

Identifying workers in registering time

present .

Quality control in assembly lines.

Reading a bar code optically is much faster

than using a keyboard and pressing a large

number of times for all the numbers of the

identification code.


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Laser in Medical Field

Lasers in the Medical Field

have found the most beneficialand useful applications in the

field of medicine

Laser has established

A Revolution in medicine Field


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Eye Treatment

Ruby laser was invented in 1960 and in

1961, it was used by eye doctors.

It is natural that the eye was chosen to

be the first organ for performing

medical experiments.

Since the eye is transparent to the

electromagnetic spectrum in the

visible range.

Another natural device that helps was

the lens in the eye, which focuses the

electromagnetic radiation onto the

retina.


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Eye Treatment

Excimer laser commonly used in

eye surgery and semiconductor

manufacturing.

Use this laser under computer

control to change in the shape of

the cornea.

Removing sub micron layers from

the cornea. Most of the problems with

focusing the image on the retina

can be repaired.


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Cosmetic Treatment

Laser technology is being used for huge

number of cosmetic treatments.

Skin Treatment

Hair Removal

Dentistry


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Skin Treatment

Most skin pigmentation is superficial and

can be treated with the use of lasers to

reduce its appearance. The methods that can be used to treat

skin pigmentation will be in direct relation

to its cause and severity.

generally shorter-wave-length systems

Q-switched 532nm Nd:YAG laser

recur frequently

Freckles


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Hair Removal

Ruby, alexandrite, diode, 1064nm YAG, IPL

Ruby (skin types fair to medium light)

Diode 810nm can treat darker skinned

patients (medium light to medium dark)

1064 nm YAG safest for skin types medium

dark to deep.

IPL appears equally as effective in skin types

medium dark to deep.

IPL can be used in all skin types.


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Laser Use in Dentistry

Tooth decay: Lasers are used to

remove decay within a tooth and

prepare the surrounding enamel

for receipt of the filling.

Lasers are also used to "cure" or

harden a filling.

Gum disease: Lasers are used toreshape gums and remove bacteria

during root canal procedures.


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Laser Use in Dentistry

Biopsy or lesion removal: Lasers can be

used to remove a small piece of tissue.

Laser are also used to remove lesions inthe mouth and relieve the pain of canker

sores.

Teeth whitening: Lasers are used to

speed up the in-office teeth whiteningprocedures.

A peroxide bleaching solution, applied to

the tooth surface, is "activated" by laser

energy, which speeds up of the

whitening process.


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Conclusion

In this period of time the technology has changed human lifedrastically. Some of the important inventions made by physicists

that have changed our life are LASER, Optical fibers, X-rays.

Lasers and optical fibers have dramatically increased the capacity ofthe international telephone system. The new communicationtechnology has fueled the exponential growth of the Internet.

The LASER is used in the product development ( CD player, barcode scanner), medical field, industry, defense, research, cosmeticskin treatments and dentistry.


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T H A N K Y O U

GUIDED

BY

BY

ROSE MARY

laser beam in our life uses and applications 3281 by raja raja varma

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