Beam quality degradation of a higher order transverse mode beam due to spherical aberration of a lens.
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.
George
Jogy
J
Raja Ramanna Centre for Advanced Technology, Indore, India 452 013. jogy@rrcat.gov.in
Seihgal
Renuka
R
Oak
S M
SM
Mehendale
S C
SC