Abstract

Thermal focusing and defocusing of a laser beam in an absorbing dielectric is studied when the laser operates in the TEM01 mode. The paraxial-ray approximation is employed to obtain an analytical solution of the wave equation. When the refractive index decreases with increasing temperature, the electromagnetic energy converges in the x direction and diverges in the y direction; the reverse is the case when the refractive index increases with increasing temperature. The authors have also studied the geometric-optics self-focusing of laser beams operating in the (i) doughnut mode and (ii) mixed TEM00 and TEM10 cylindrical modes oscillating in phase opposition. In both cases, the energy of the beam concentrates around a circular ring of maximum irradiance.

© 1975 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Asymmetric focusing of a laser beam in TEM01 doughnut mode in a nonlinear dielectric*

M. S. Sodha, V. P. Nayyar, and V. K. Tripathi
J. Opt. Soc. Am. 64(7) 941-943 (1974)

Beam wander in a turbulent medium: An application of Ehrenfest’s theorem

Richard J. Cook
J. Opt. Soc. Am. 65(8) 942-948 (1975)

Theory of relativistic self-focusing of laser radiation in plasmas

Heinrich Hora
J. Opt. Soc. Am. 65(8) 882-886 (1975)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (2)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (34)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription