PPT - Lasers Civil Engineering (CE) Notes | EduRev

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Civil Engineering (CE) : PPT - Lasers Civil Engineering (CE) Notes | EduRev

 Page 1


LASER
Light Amplification by Stimulated
Emission of Radiation
Page 2


LASER
Light Amplification by Stimulated
Emission of Radiation
? Objectives…
?Introduction and understand the principle of
LASER
• Light Amplification by Stimulated Emission of
Radiation
• Absorption
• Spontaneous Emission
• Stimulated Emission
• Population Inversion
• Optical Pumping
Page 3


LASER
Light Amplification by Stimulated
Emission of Radiation
? Objectives…
?Introduction and understand the principle of
LASER
• Light Amplification by Stimulated Emission of
Radiation
• Absorption
• Spontaneous Emission
• Stimulated Emission
• Population Inversion
• Optical Pumping
? Objectives…
? Characteristics or Properties of Laser Light
• Coherence
• High Intensity
• High directionality
• High monochromaticity
Laser light is highly powerful and it is capable 
of propagating over long distances and it is not 
easily absorbed by water.
Page 4


LASER
Light Amplification by Stimulated
Emission of Radiation
? Objectives…
?Introduction and understand the principle of
LASER
• Light Amplification by Stimulated Emission of
Radiation
• Absorption
• Spontaneous Emission
• Stimulated Emission
• Population Inversion
• Optical Pumping
? Objectives…
? Characteristics or Properties of Laser Light
• Coherence
• High Intensity
• High directionality
• High monochromaticity
Laser light is highly powerful and it is capable 
of propagating over long distances and it is not 
easily absorbed by water.
? Introduction
• LASER
“Light Amplification by Stimulated Emission
of Radiation”
• MASER (1939 Towner)
“Microwave Amplification by Stimulated
Emission of Radiation”
• Stimulated Emission - Einstein in 1917.
• Ruby Crystal LASER - Maiman, California in 1960.
• He-Ne LASER - Ali Javan in 1961.
• Diode LASER- Hall in 1962.
Page 5


LASER
Light Amplification by Stimulated
Emission of Radiation
? Objectives…
?Introduction and understand the principle of
LASER
• Light Amplification by Stimulated Emission of
Radiation
• Absorption
• Spontaneous Emission
• Stimulated Emission
• Population Inversion
• Optical Pumping
? Objectives…
? Characteristics or Properties of Laser Light
• Coherence
• High Intensity
• High directionality
• High monochromaticity
Laser light is highly powerful and it is capable 
of propagating over long distances and it is not 
easily absorbed by water.
? Introduction
• LASER
“Light Amplification by Stimulated Emission
of Radiation”
• MASER (1939 Towner)
“Microwave Amplification by Stimulated
Emission of Radiation”
• Stimulated Emission - Einstein in 1917.
• Ruby Crystal LASER - Maiman, California in 1960.
• He-Ne LASER - Ali Javan in 1961.
• Diode LASER- Hall in 1962.
? Light having following Properties
? Wavelength
? Frequency
? Amplitude
? Phase
? Coherence/Incoherence
? Velocity
? Direction
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