Figures of merit for laser beam quality

T. D. Milster, E. P. Walker

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations


We show how FWHM, FW1/e2, Strehl ratio, and encircled energy figures of merit vary with different types of aberration and measurement methods. We examine in detail the array sampling method and the slit-scan method. Our irradiance in the exit pupil of the optical system is a simple Gaussian. We found that in general the slit-scan method and the array method do not yield the same result. The width measurements for the central lobe of the diffraction pattern are very insensitive to aberration.

Original languageEnglish (US)
Pages (from-to)79-85
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Apr 22 1993
EventLaser Energy Distribution Profiles: Measurement and Applications 1992 - Boston, United States
Duration: Nov 16 1992 → …

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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