Abstract

In this work, we present a theoretical model that describes induced temperature and refractive index profiles generated by the Laguerre–Gaussian (LG) excitation beam. A comparison between LG and conventional fundamental mode ${{\rm TEM}_{00}}$ is drawn. It indicates that there is a decrease or increase around the optical axis ($ z $, ${r} = 0$) in the refractive index by ${\rm LG}_1^0$ and ${\rm LG}_0^5$, thus enabling an enhancement of the refractive index gradient along the radius $r$. The temperature and refractive index profiles produced by the higher-order LG modes are compared with those of a conventional fundamental ${{\rm TEM}_{00}}$ Gaussian beam. The results indicate that there is an increase along the radius in the refractive index gradient generated by ${\rm LG}_1^0$ and ${\rm LG}_0^5$, which could enhance the sensitivity in photothermal lens detection.

© 2020 Optical Society of America

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