final presentation anti laser12

8/7/2019 final presentation anti laser12

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Presented By:- Namrata Bhardwaj

Sushil Kumar


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Laser has 50 years since laser was 1st invented by Theodore

Maiman in 1960.

Anti-Laser built for 1st time in 17 feb 2011 by Jeff-Hecht.


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Light amplification by Stimulated Emission of Radiation

Coherent

Monochromatic

Collimated

Sharply Focussed

Coherent Light


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E1

hY13

E2

Metastable

state

E1

E3

E2

hY3 2

E1

E3

E2

E1

E3

E2

hY21

hY21

Coherent photons

OUT

(a) (b ) (c) (d )

E3

.

IN

In actual case, excite atoms from E1 to E3.

Exciting atoms from E1

to E3

optical pumping.

Atoms from E3 decays rapidly to E2 emitting hY3.

If E2 is a long lived state, atoms from E2 will not decay to E1 rapidly.

Condition where there are a lot of atoms in E2 population inversion achieved!

i.e. between E2 and E1.


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When one atom in E2 decaysspontaneously, a random photon resultedwhich will induce stimulated photon from

the neighboring atoms.

The photons from the neighbouringatoms will stimulate their neighbours and

form avalanche of photons.

Large collection of coherent photonsresulted.


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A coherent perfect absorber (CPA).

Inverse of laser.

Energy is released from the absorption process in the form ofheat.

In conventional laser use a so-called gain medium whole in

anti laser loss-medium is used.


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At YALA University the basic function oflaser & flipped it around introducing a device thatabsorb rather than emits, a beam of light.

This device is able to absorb 99.45% of allincoming beam.

The device which the scientist

call a C.P.A or morepopularly Anti-Laser.

The most popular anti-laser are,

G9 & G8 dual head.


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Identical laser are fired towards one-another through a piece of light-absorbing material, like Si. This method substitute the Gain Medium ofa laser with a material which exhibits opposing properties. This causemost of the Photons to be absorbed, while the remaining light waves

are cancel out by interfering with each other.


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The most obvious use of anti-laser is in computing.

The next generation of high performance computers are going to

have hybrid chips. These computer are called Optic-computer .

For intense in new type of optical switches.

In traffic, it is used as LIDAR:- e.g.Police laser radar.

It is used also in radiology.

It may also have medical application such as imaging a tumor.


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Since anti-laser is a very new concept so it is not accessible to every

NOOK & CORNER around the globe.

Even though the anti-laser absorbs perfectly, at a specificwavelength thus it unsuitable for the application like solar-panels.

It never be used as a potential laser-shield.


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final presentation anti laser12

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