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Proceedings Paper

Aberration correction in double-pass amplifiers through the use of phase-conjugate mirrors and/or adaptive optics
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Paper Abstract

Corrrection of birefringence induced effects (depolarization and bipolar focusing) was achieved in double-pass amplifiers using a Faraday rotator placed between the laser rod and the retroreflecting optic. A necessary condition was that each ray in the beam retraced its path through the amplifying medium. Retrace was limited by imperfect conjugate-beam fidelity and by nonreciprocal double-pass indices of refraction.We compare various retroreflectors: stimulated Brillouin scatter phase-conjugate-mirrors (PCMs), PCMs with relay lenses to image the rod principal plane onto the PCM entrance aperture (IPCMs), IPCMs with external, adaptively-adjusted, astigmatism-correcting cylindrical doublets, and all adaptive optics imaging variable-radius-mirrors (IVRMs). Results with flashlamp pumped, Nd:Cr:GSGG double-pass amplifiers show that average output power increased fivefold with a Faraday rotator plus complete nonlinear optics retroreflector package (IPCM+cylindrical zoom), and that this represents an 80% increase over the power achieved using just a PCM. Far better results are, however, achieved with an IVRM.

Paper Details

Date Published: 24 April 2001
PDF: 5 pages
Proc. SPIE 4270, Laser Resonators IV, (24 April 2001); doi: 10.1117/12.424670
Show Author Affiliations
Steven M. Jackel, Soreq Nuclear Research Ctr. (Israel)
Inon Moshe, Soreq Nuclear Research Ctr. (Israel)
Raphael Lavi, Soreq Nuclear Research Ctr. (Israel)


Published in SPIE Proceedings Vol. 4270:
Laser Resonators IV
Alexis V. Kudryashov; Alan H. Paxton, Editor(s)

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