Podcast
Questions and Answers
What does the acronym LASER stand for?
What does the acronym LASER stand for?
What is the essential component of a laser system responsible for establishing population inversion and stimulated emission?
What is the essential component of a laser system responsible for establishing population inversion and stimulated emission?
Who first put forward the basic scientific principle behind a laser?
Who first put forward the basic scientific principle behind a laser?
What is the pumping mechanism in a laser system responsible for achieving?
What is the pumping mechanism in a laser system responsible for achieving?
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What is the function of the optical resonator in a laser system?
What is the function of the optical resonator in a laser system?
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When was the first pulsed laser developed?
When was the first pulsed laser developed?
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What is the primary pumping mechanism in a gas laser?
What is the primary pumping mechanism in a gas laser?
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What type of laser system does the Ruby Laser exemplify?
What type of laser system does the Ruby Laser exemplify?
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What is the main active center in the He-Ne laser?
What is the main active center in the He-Ne laser?
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In a laser system, what initiates stimulated emission?
In a laser system, what initiates stimulated emission?
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What causes lasing to cease and the laser to become inactive?
What causes lasing to cease and the laser to become inactive?
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What is the primary method of achieving population inversion in a solid state laser?
What is the primary method of achieving population inversion in a solid state laser?
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What type of energy level system does a He-Ne laser utilize?
What type of energy level system does a He-Ne laser utilize?
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What material is the Ruby crystal made of?
What material is the Ruby crystal made of?
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Which laser has relatively inefficient energy conversion of 0.1 to 1%?
Which laser has relatively inefficient energy conversion of 0.1 to 1%?
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What causes the depopulation of the metastable state E2 in a Ruby Laser?
What causes the depopulation of the metastable state E2 in a Ruby Laser?
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Study Notes
LASER Fundamentals
- LASER stands for Light Amplification by Stimulated Emission of Radiation.
Laser Components and Mechanisms
- The essential component of a laser system responsible for establishing population inversion and stimulated emission is the gain medium.
- Albert Einstein first put forward the basic scientific principle behind a laser.
- The pumping mechanism in a laser system is responsible for achieving population inversion.
Laser System Functions
- The function of the optical resonator in a laser system is to provide feedback, allowing the stimulated emission to build up and create a coherent beam of light.
Laser Development and History
- The first pulsed laser was developed in 1960.
Laser Types and Characteristics
- The primary pumping mechanism in a gas laser is electrical discharge.
- The Ruby Laser exemplifies a solid-state laser system.
- The main active center in the He-Ne laser is Ne (neon).
- The He-Ne laser utilizes a three-level energy system.
Laser Physics and Processes
- Stimulated emission is initiated by the presence of photons in the resonator.
- Lasing ceases and the laser becomes inactive when the population inversion is lost.
- In a solid-state laser, population inversion is primarily achieved through optical pumping.
- The Ruby crystal is made of aluminum oxide (Al2O3) with chromium impurities.
- The Ruby laser has a relatively inefficient energy conversion of 0.1 to 1%.
- The depopulation of the metastable state E2 in a Ruby Laser is caused by spontaneous emission and non-radiative decay.
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Description
Test your knowledge of Chapter 4: Laser and Fibre Optics in Engineering Physics II. Learn about the acronym LASER, the scientific principle behind lasers, and the development of the first laser in 1960.
