LASER

© sumedha
LASER
•
•
•
•
•

Light
Amplification by
Stimulated
Emission of
Radiation

• Proposed by Einstein in 1917
• First LASER was...
Excite / Stimulate
E2

E2

e

E2

hf
e

1

e

E1

2
© sumedha

E1

E1

3
Population Inversion
(Excite / Stimulate (More))
E2

E2 hf
hf
hf
e e e e
E1 hf

e e e e

E1

Hf = E2-E1
© sumedha

e e e e...
Spontaneous Emission
(A random process)

e

e

E2

E2

e e e

hf
hf

E1

hf

E1

A Random Process

hf = E2-E1
© sumedha
Stimulated Emission

E2

e

e
hf

hf

hf
hf

E1
hf = E2-E1
© sumedha

L
A
S
E
R
Three State Laser System

e

e

e

e

E3

hf
hf

E2

hf
hf
e

e

e

e

E1
© sumedha

e

e

e

e
Three State Laser System (Contd..)
E3

E2

e

e
hf

hf

hf

hf

E1
hf = E2-E1
© sumedha

L
A
S
E
R
Ruby Laser

Visual
© sumedha
He-Ne Laser

© sumedha
© sumedha
LASER Applications
Virtual Keyboard

© sumedha
Laser Printer

© sumedha
Laser Treatment for Skin

© sumedha
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How laser work

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This will explain the basic principles of laser. This will help the students in GCE A/L students

Published in: Education
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How laser work

  1. 1. LASER © sumedha
  2. 2. LASER • • • • • Light Amplification by Stimulated Emission of Radiation • Proposed by Einstein in 1917 • First LASER was built in 1960 © sumedha
  3. 3. Excite / Stimulate E2 E2 e E2 hf e 1 e E1 2 © sumedha E1 E1 3
  4. 4. Population Inversion (Excite / Stimulate (More)) E2 E2 hf hf hf e e e e E1 hf e e e e E1 Hf = E2-E1 © sumedha e e e e E2 E1
  5. 5. Spontaneous Emission (A random process) e e E2 E2 e e e hf hf E1 hf E1 A Random Process hf = E2-E1 © sumedha
  6. 6. Stimulated Emission E2 e e hf hf hf hf E1 hf = E2-E1 © sumedha L A S E R
  7. 7. Three State Laser System e e e e E3 hf hf E2 hf hf e e e e E1 © sumedha e e e e
  8. 8. Three State Laser System (Contd..) E3 E2 e e hf hf hf hf E1 hf = E2-E1 © sumedha L A S E R
  9. 9. Ruby Laser Visual © sumedha
  10. 10. He-Ne Laser © sumedha
  11. 11. © sumedha
  12. 12. LASER Applications Virtual Keyboard © sumedha
  13. 13. Laser Printer © sumedha
  14. 14. Laser Treatment for Skin © sumedha

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