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Re: A list of textbook miscon: spatial coherence



On Fri, 13 Feb 1998, John Gastineau wrote:

Some LASERs do have amplifiers. I have built and/or used several
different systems which include a low-power oscillator section with a
mirrored cavity, and one or more stages of amplification. The amplifier
stages consist of the same active medium as in the oscillator, but
pumped with much higher power. The output beam makes but one pass
through each amplifier. Each stage multiplies the output power by
10-20X. The gain is limited by the undesired amplification of
spontaneous emission from the oscillator and prior amplifier stages.

John,

Do these amplifiers greatly increase the transverse coherence length of
the oscillator's optical output?


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