Light Ampliation by stimulated Emission of Laser
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Laser technology works by stimulating the emission of coherent light through a process called population inversion. A laser produces a concentrated beam of light that is coherent, monochromatic, and directional. It works by first absorbing energy to excite electrons to higher energy levels, followed by spontaneous emission of photons. Further exposure to photons causes stimulated emission, which produces additional photons that are coherent with the first. When there are more excited atoms than unexcited atoms, a population inversion occurs, allowing for light amplification through stimulated emission. Lasers have many applications in science, medicine, industry, communications and more due to their unique light properties.
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বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
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This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
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Light Ampliation by stimulated Emission of Laser
- 1. “Fools find excuses to cover their inabilities”
- 2. LASER (Light Amplification by Stimulated Emission of Radiation)
- 3. What Is Laser Properties Of Laser Basic Concept Of Laser Absorption Spontaneous Emission Stimulated Emission The operation of the Laser How a Laser Works Population Inversion Types of Laser Applications of laser Overview
- 4. What is Laser? Light Amplification by Stimulated Emission of Radiation • A device produces a coherent beam of optical radiation by stimulating electronic, ionic, or molecular transitions to higher energy levels • Mainly used in Single Mode Systems • Light Emission range: 5 to 10 degrees • Require Higher complex driver circuitry than LEDs • Laser action occurs from three main processes: photon absorption, spontaneous emission, and stimulated emission.
- 5. Properties of Laser • Monochromatic Concentrate in a narrow range of wavelengths (one specific colour). • Coherent All the emitted photons bear a constant phase relationship with each other in both time and phase • Directional A very tight beam which is very strong and concentrated.
- 6. Basic concepts for a laser • Absorption • Spontaneous Emission • Stimulated Emission • Population inversion
- 7. Absorption • Energy is absorbed by an atom, the electrons are excited into vacant energy shells.
- 8. Spontaneous Emission • The atom decays from level 2 to level 1 through the emission of a photon with the energy hv. It is a completely random process.
- 9. Stimulated Emission • Atoms in an upper energy level can be triggered or stimulated in phase by an incoming photon of a specific energy.
- 10. Stimulated Emission The stimulated photons have unique properties: – In phase with the incident photon – Same wavelength as the incident photon – Travel in same direction as incident photon
- 11. The operation of the Laser Light: Coherent, polarized The stimulating and emitted photons have the same: frequency phase direction
- 12. How a Laser Works
- 13. Condition for the laser operation If n1 > n2 • radiation is mostly absorbed absorbowane • spontaneous radiation dominates. • most atoms occupy level E2, weak absorption • stimulated emission prevails • light is amplified if n2 >> n1 - population inversion Necessary condition: population inversion E1 E2
- 14. Population Inversion • A state in which a substance has been energized, or excited to specific energy levels. • More atoms or molecules are in a higher excited state. • The process of producing a population inversion is called pumping. • Examples: →by lamps of appropriate intensity →by electrical discharge
- 15. Types of Laser
- 23. Applications of laser 1. Scientific • Spectroscopy • Lunarlaserranging • Photochemistry • Lasercooling • Nuclearfusion 2. Military • Deathray • Defensive applications • Strategicdefense initiative • Lasersight • Illuminator • Rangefinder • Targetdesignator
- 24. 3. Medical Eyesurgery Cosmeticsurgery Application 4. Industry & Commercial a. Cutting,welding,marking b.CDplayer,DVDplayer c. Laserprinters,laser pointers d.Photolithography e.Laserlightdisplay
- 25. THANK YOU