Physics – Optics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apopt..26.1594e&link_type=abstract
Applied Optics (ISSN 0003-6935), vol. 26, May 1, 1987, p. 1594-1602.
Physics
Optics
2
Cassegrain Optics, Geometrical Optics, Light Amplifiers, Spontaneous Emission, Telescopes, Apertures, Mirrors
Scientific paper
The paper considers all possible paths for amplifed spontaneous emission (ASE) in multipass laser amplifiers using a Cassegranian telescope geometry. In particular, ASE which is reflected back into the medium off the telescope mirrors themselves is studied. These ASE components are unavoidable in this amplifier geometry. It is shown that there is a component of the ASE which makes approximately double the number of passes through the amplifier as the laser signal makes. It is also shown that these high-order ASE components are also present in amplifiers which are almost Cassegrainian. They cannot be eliminated by changing the ratio of the scraper and hole radii or the separation of the mirrors. It is likely that these ASE components will be more significant in pulsed lasers than CW lasers.
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