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27 February 2019 asghar.jarwar@gmail.com
Definition:-
A kind of device that produced the
highly directional, coherent and monochromatic
light beam is called a Laser.
 LASER STAND FOR:-
L LIGHT
A AMPLIFICATION
S STIMULATED
E EMISSION
R RADIATION
LIGHT AMPLIFICATION BY STIMULATED EMISSION OF
RADIATION
27 February 2019 asghar.jarwar@gmail.com
THREE RADIATION PROCESS OF LASER LIGHT
PROCESS BEFORE AFTER
INDUCED ABSORPTION
(Stimulated)
E2
e
hf E1
e E2
E1
No emission
SPONTANEOUS
EMISSION
10^-8 sec E2
E1
No incident of Photon
E1
hf
E2
STIMULATED
EMISSION
e E2
hf
E1
E2
E127 February 2019 asghar.jarwar@gmail.com
 THE LASER PRINCIPLE:-
The Laser principle are given
below, on which this device is work.
 ABSORPTION
 SPONTANEOUS EMISSION
 STIMULATED EMISSION
 PROPERTIES OF LASER:-
 Monochromatic Light Source
 Coherence
 Collimated ( parallel rays of Light )
27 February 2019 asghar.jarwar@gmail.com
OPERATION OF LASER:-
 METASTABLE STATE
The energy state of an electron on
which the electron is present ,having much longer life time than
10^-8 sec is called metastable state .
POPULATION INVERSION
To increases the number of electrons
STIMULATED EMISSION
 AMPLIFICATION Using Mirrors
27 February 2019 asghar.jarwar@gmail.com
10^-8 sec
E3
hf
10^-3 sec
E2
hf
electron E1
hf
27 February 2019 asghar.jarwar@gmail.com
 The first successful operation of ruby laser was achieved by
T.H Maiman in the year 1960.
 RUBY is a crystal (highly arranged atoms in well define patterns are called crystals) of
aluminum oxide.
Al2O3
In which small numbers of aluminum atoms are replaced by
chromium atoms, that have lost three electrons.
Al2O3 : Cr +3
Q. Why we added the chromium atoms in ruby crystal????
Ans: Because chromium atoms absorbs green and yellow light
but emit red and blue light.
27 February 2019 asghar.jarwar@gmail.com
 Ruby Laser Rod ( 5 cm long ) ( Filled with Xenon gas )
 Helical flash lamp ( Provides the pumping yellow and green light )
 High voltage supplier
 Two concave mirrors (fully reflected and partially reflected)
 Key
27 February 2019 asghar.jarwar@gmail.com
Fully reflected
mirror M1
Partially
reflected
mirror M2
Colorless
gas
Output
power is
20 kW
27 February 2019 asghar.jarwar@gmail.com
27 February 2019 asghar.jarwar@gmail.com
Uses of Ruby Laser
1. Range finding
2. Welding
3. Drilling
27 February 2019 asghar.jarwar@gmail.com
 Different types of laser are used according to wavelength and power level which range from mile
watts to MW.
1. Solid Laser:-
it is made from crystals, eg Ruby laser, semiconductor laser (size of a pin head ) ( they are used in
optical fiber communication system )
2. Liquid Laser :-
It is made from alcohol or methanol operated at room temperatrue
3. Gas Laser:-
Helium, neon and carbon di- oxide gas lasers are widely used
Used in printing and holography ( 3D image in Space ) also used in an accurate measurement of
length
Laser also used for medicine and surgery purposes
Industry
Computer (Laser printer )
Communications
Space (range )
Environment ( Pollutants detector )
LASER is also know as MASER (Mico-wave amplification)
27 February 2019 asghar.jarwar@gmail.com
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Introduction to lasers

  • 1. 27 February 2019 asghar.jarwar@gmail.com
  • 2. Definition:- A kind of device that produced the highly directional, coherent and monochromatic light beam is called a Laser. LASER STAND FOR:- L LIGHT A AMPLIFICATION S STIMULATED E EMISSION R RADIATION LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION 27 February 2019 asghar.jarwar@gmail.com
  • 3. THREE RADIATION PROCESS OF LASER LIGHT PROCESS BEFORE AFTER INDUCED ABSORPTION (Stimulated) E2 e hf E1 e E2 E1 No emission SPONTANEOUS EMISSION 10^-8 sec E2 E1 No incident of Photon E1 hf E2 STIMULATED EMISSION e E2 hf E1 E2 E127 February 2019 asghar.jarwar@gmail.com
  • 4. THE LASER PRINCIPLE:- The Laser principle are given below, on which this device is work. ABSORPTION SPONTANEOUS EMISSION STIMULATED EMISSION PROPERTIES OF LASER:- Monochromatic Light Source Coherence Collimated ( parallel rays of Light ) 27 February 2019 asghar.jarwar@gmail.com
  • 5. OPERATION OF LASER:- METASTABLE STATE The energy state of an electron on which the electron is present ,having much longer life time than 10^-8 sec is called metastable state . POPULATION INVERSION To increases the number of electrons STIMULATED EMISSION AMPLIFICATION Using Mirrors 27 February 2019 asghar.jarwar@gmail.com
  • 6. 10^-8 sec E3 hf 10^-3 sec E2 hf electron E1 hf 27 February 2019 asghar.jarwar@gmail.com
  • 7. The first successful operation of ruby laser was achieved by T.H Maiman in the year 1960. RUBY is a crystal (highly arranged atoms in well define patterns are called crystals) of aluminum oxide. Al2O3 In which small numbers of aluminum atoms are replaced by chromium atoms, that have lost three electrons. Al2O3 : Cr +3 Q. Why we added the chromium atoms in ruby crystal???? Ans: Because chromium atoms absorbs green and yellow light but emit red and blue light. 27 February 2019 asghar.jarwar@gmail.com
  • 8. Ruby Laser Rod ( 5 cm long ) ( Filled with Xenon gas ) Helical flash lamp ( Provides the pumping yellow and green light ) High voltage supplier Two concave mirrors (fully reflected and partially reflected) Key 27 February 2019 asghar.jarwar@gmail.com
  • 9. Fully reflected mirror M1 Partially reflected mirror M2 Colorless gas Output power is 20 kW 27 February 2019 asghar.jarwar@gmail.com
  • 10. 27 February 2019 asghar.jarwar@gmail.com
  • 11. Uses of Ruby Laser 1. Range finding 2. Welding 3. Drilling 27 February 2019 asghar.jarwar@gmail.com
  • 12. Different types of laser are used according to wavelength and power level which range from mile watts to MW. 1. Solid Laser:- it is made from crystals, eg Ruby laser, semiconductor laser (size of a pin head ) ( they are used in optical fiber communication system ) 2. Liquid Laser :- It is made from alcohol or methanol operated at room temperatrue 3. Gas Laser:- Helium, neon and carbon di- oxide gas lasers are widely used Used in printing and holography ( 3D image in Space ) also used in an accurate measurement of length Laser also used for medicine and surgery purposes Industry Computer (Laser printer ) Communications Space (range ) Environment ( Pollutants detector ) LASER is also know as MASER (Mico-wave amplification) 27 February 2019 asghar.jarwar@gmail.com