Numerical study of beam cleanup by stimulated Raman scattering
article
One can use stimulated Raman scattering to obtain a near-diffraction-limited Stokes beam from a multimode
pump beam if the Raman amplifrer is seeded with a TEMoo Stokes beam. In this way a smooth beam is obtained
from a rough beam; hence the term beam cleanup. We investigate the Raman amplifrer confrguration
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 neat 1.0 is possible
at low amplification. However, the M2 increases rapidly for higher amplifications. For Gaussian-Schellmodel
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 TEMoo beam reduces The M2 of the Stokes beam at
the output.
pump beam if the Raman amplifrer is seeded with a TEMoo Stokes beam. In this way a smooth beam is obtained
from a rough beam; hence the term beam cleanup. We investigate the Raman amplifrer confrguration
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 neat 1.0 is possible
at low amplification. However, the M2 increases rapidly for higher amplifications. For Gaussian-Schellmodel
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 TEMoo beam reduces The M2 of the Stokes beam at
the output.
Topics
TNO Identifier
94793
Source
Journal of the Optical Society of America B, 12(April), pp. 650-657.
Pages
650-657
Files
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