dscaccacaca

1. Light Amplification by Stimulated Emission of Radiation

2. Ruby Laser, by T. H. Maiman, 1960

3. National Ignition Facility, Lawrence Livermore Lab
1.8MJ, 192 Lasers
106J fired every second
106W = 10,000 100W lightbulbs
Enough to supply 3000 households

4. Nova Target Chamber (LBNL) - Laser Fusion

7. 1 0
Compact Disc (CD) Reader

10. E
hn
absorption emission Stimulated emission

11. i
E
f
E
Mirror Mirror
Population inversion

12. i
E
f
E
Mirror Mirror
Spontaneous emission

13. i
E
f
E
Mirror
Mirror
Stimulated emission

14. i
E
f
E
Mirror
Mirror
Feed-back by the cavity

15. i
E
f
E
Mirror
Mirror
Stimulated emission

16. i
E
f
E
Mirror
Mirror
Feed-back by the cavity

17. i
E
f
E
Mirror
Mirror
Laser beam
After several round trips…
Photons with:
- same energy : Monochromatic
- same direction of propagation : Spatial coherence
- all in synchrony: Temporal coherence

22. Dye molecules:
strong absorption & emission

23. To make a dye lase
Pump:
UV laser
Cylinder Lens
Partial (4%) reflector

24. Off to the Lab!