Papers

Optical and Quantum Electronics

, Volume 26, Issue 6, pp 629-632

First online:

Measurement of beam quality degradation due to spherical aberration in a simple lens

  • Joseph A. RuffAffiliated withEdward L. Ginzton Laboratory, Stanford University
  • , A. E. SiegmanAffiliated withEdward L. Ginzton Laboratory, Stanford University

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Abstract

We have measured the effect on laser beam quality factorM 2 of spherical aberration in a simple planoconvex lens. Theory predicts that the laser beam quality should remain essentially unchanged until the incident beam widthw exceeds a critical widthw q above which the beam quality will degrade rapidly, with theM 2 value increasing as (w/w q 4). We find good agreement between this theory and our experimental data.