KCET2009PhysicsExperimental Physics
In ruby laser, the stimulated emission is due to transition from
Options
- Ametastable state to any lower state
- Bany higher state to lower state
- Cmetastable state to ground state
- Dany higher state to ground state
Correct answer
C. metastable state to ground state
Step-by-step solution
For a ruby laser, a crystal of ruby is formed into a cylinder. A fully reflecting mirror is placed on one end and a partially reflecting mirror on the other. A high-intensity lamp is spiraled around the ruby cylinder to provide a flash of white light that triggers the laser action. The green and blue wavelengths in the flash excite electrons in the chromium atoms to a higher energy level. Upon returning to their normal state, the electrons emit their characteristic ruby-red light. The mirrors reflect some of this l