title: Beam quality degradation of a higher order transverse mode beam due to spherical aberration of a lens.
abstract: An analysis of the increase in the beam-propagation factor, M2, of a higher order transverse mode beam caused by quartic phase aberration after transmission through a spherically aberrated lens is reported. The analysis shows that for a given beam size, the increase in the M2 parameter is less for a higher order transverse mode beam as compared to that for a diffraction limited beam. Experimental results using a multimode laser diode beam show good agreement with the theoretical results.
authors.affiliation: Raja Ramanna Centre for Advanced Technology, Indore, India 452 013. jogy@rrcat.gov.in
authors.forename: Jogy
authors.initials: J
authors.lastname: George
authors.forename: Renuka
authors.initials: R
authors.lastname: Seihgal
authors.forename: S M
authors.initials: SM
authors.lastname: Oak
authors.forename: S C
authors.initials: SC
authors.lastname: Mehendale