How laser work
-
Upload
sumedha-athawuda -
Category
Education
-
view
177 -
download
0
description
Transcript of How laser work
![Page 1: How laser work](https://reader037.fdocuments.in/reader037/viewer/2022110308/556e336ed8b42a6a698b521d/html5/thumbnails/1.jpg)
© sumedha
LASER
![Page 2: How laser work](https://reader037.fdocuments.in/reader037/viewer/2022110308/556e336ed8b42a6a698b521d/html5/thumbnails/2.jpg)
© sumedha
LASER• Light • Amplification by • Stimulated • Emission of • Radiation
• Proposed by Einstein in 1917
• First LASER was built in 1960
![Page 3: How laser work](https://reader037.fdocuments.in/reader037/viewer/2022110308/556e336ed8b42a6a698b521d/html5/thumbnails/3.jpg)
© sumedha
Excite / Stimulate
e e
hf
eE2
E1
E2
E1
E2
E1
1 2 3
![Page 4: How laser work](https://reader037.fdocuments.in/reader037/viewer/2022110308/556e336ed8b42a6a698b521d/html5/thumbnails/4.jpg)
© sumedha
Population Inversion(Excite / Stimulate (More))
e
eE2
E1
E2
E1
E2
E1
Hf = E2-E1
e e e
e e ehfhfhfhf
ee e e
![Page 5: How laser work](https://reader037.fdocuments.in/reader037/viewer/2022110308/556e336ed8b42a6a698b521d/html5/thumbnails/5.jpg)
© sumedha
Spontaneous Emission(A random process)
hf
e e e e
hf
E2
E1
E2
E1
hf = E2-E1
ehf
A Random Process
![Page 6: How laser work](https://reader037.fdocuments.in/reader037/viewer/2022110308/556e336ed8b42a6a698b521d/html5/thumbnails/6.jpg)
© sumedha
Stimulated Emission
hf
LASER
E2
E1
hf = E2-E1
hf
hf
hf
e e
![Page 7: How laser work](https://reader037.fdocuments.in/reader037/viewer/2022110308/556e336ed8b42a6a698b521d/html5/thumbnails/7.jpg)
© sumedha
e e e e
e e e e
Three State Laser System
hf
hf
hf
hf
e e e e
E3
E2
E1
![Page 8: How laser work](https://reader037.fdocuments.in/reader037/viewer/2022110308/556e336ed8b42a6a698b521d/html5/thumbnails/8.jpg)
© sumedha
hf
LASER
E2
E1hf = E2-E1
hf
hf
hf
e e
E3
Three State Laser System (Contd..)
![Page 9: How laser work](https://reader037.fdocuments.in/reader037/viewer/2022110308/556e336ed8b42a6a698b521d/html5/thumbnails/9.jpg)
© sumedha
Ruby Laser
Visual
![Page 10: How laser work](https://reader037.fdocuments.in/reader037/viewer/2022110308/556e336ed8b42a6a698b521d/html5/thumbnails/10.jpg)
© sumedha
He-Ne Laser
![Page 11: How laser work](https://reader037.fdocuments.in/reader037/viewer/2022110308/556e336ed8b42a6a698b521d/html5/thumbnails/11.jpg)
© sumedha
![Page 12: How laser work](https://reader037.fdocuments.in/reader037/viewer/2022110308/556e336ed8b42a6a698b521d/html5/thumbnails/12.jpg)
© sumedha
Virtual Keyboard
LASER Applications
![Page 13: How laser work](https://reader037.fdocuments.in/reader037/viewer/2022110308/556e336ed8b42a6a698b521d/html5/thumbnails/13.jpg)
© sumedha
Laser Printer
![Page 14: How laser work](https://reader037.fdocuments.in/reader037/viewer/2022110308/556e336ed8b42a6a698b521d/html5/thumbnails/14.jpg)
© sumedha
Laser Treatment for Skin