Re: SparkChambers
The HeNe laser is a very marginal device, to be honest. The single-pass gain can be as low as a percent or two. So the outcoupling has to be a good deal less than this, requiring a cavity Q of several hundred. Any slight misalignment of the mirrors, or optical absorption/scattering losses due to sputtered contamination, will snuff it out.
Cheers,
GJ
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