Abstract

One can use stimulated Raman scattering to obtain a near-diffraction-limited Stokes beam from a multimode pump beam if the Raman amplifier is seeded with a TEM00 Stokes beam. In this way a smooth beam is obtained from a rough beam; hence the term beam cleanup. We investigate the Raman amplifier configuration numerically, using various pump beam profiles. Analysis of the quality of the amplified beams is based on the M2 concept. For Gaussian–Hermite pump beams, excellent beam cleanup with an M2 near 1.0 is possible at low amplification. However, the M2 increases rapidly for higher amplifications. For Gaussian–Schell-model beams, beam cleanup is limited even at low amplification to a reduction in the M2 of approximately a factor of 2. Increasing the power of the initial Stokes TEM00 beam reduces the M2 of the Stokes beam at the output.

© 1995 Optical Society of America

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