Lecture 8: Laser amplifiers
Lecture 8: Laser amplifiers
Lecture 8: Laser amplifiers
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Ideal coherent <strong>amplifiers</strong><br />
<br />
<br />
<br />
<br />
An ideal coherent amplifier is a linear system that increases<br />
the amplitude of the input signal by a fixed factor, the<br />
amplifier gain.<br />
A sinusoidal input leads to a sinusoidal output at the same<br />
frequency, but with larger amplitude.<br />
The gain of the ideal amplifier is constant for all frequencies<br />
within the amplifier spectral bandwidth.<br />
The amplifier may impart to the input signal a phase shift that<br />
varies linearly with frequency (corresponding to a time delay<br />
at the output with respect to the input).<br />
phase<br />
gain<br />
<br />
<br />
Output amp.<br />
Input amplitude<br />
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