24 April 2001 Aberration correction in double-pass amplifiers through the use of phase-conjugate mirrors and/or adaptive optics
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Proceedings Volume 4270, Laser Resonators IV; (2001) https://doi.org/10.1117/12.424670
Event: Photonics West 2001 - LASE, 2001, San Jose, CA, United States
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.
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Steven M. Jackel, Inon Moshe, Raphael Lavi, "Aberration correction in double-pass amplifiers through the use of phase-conjugate mirrors and/or adaptive optics", Proc. SPIE 4270, Laser Resonators IV, (24 April 2001); doi: 10.1117/12.424670; https://doi.org/10.1117/12.424670
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