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Revista mexicana de física

Print version ISSN 0035-001X

Rev. mex. fis. vol.53 n.2 México Apr. 2007

 

Diffraction of beams by Ronchi rulings: comparison between two methods for gaussian spot size measurements

 

A. Ortiz–Acebedo*, O. Mata–Mendez*, F. Chavez–Rivas*, D. Hernández–Cruz** and Roger A. Lessard**

 

* Departamento de Física, Escuela Superior de Física y Matematicas, Instituto Politécnico Nacional, 07738 Zacatenco, Distrito Federal, México, e–mail: omatax@yahoo.com

** Center of Optics, Photonics and Lasers. Department of Physics, Engineering Physics and Optics, Laval University. Quebec (Quebec) G1K 7P4, Canada.

 

Recibido el 29 de noviembre de 2006
Aceptado el 28 de marzo de 2007

 

Abstract

Two independent methods for Gaussian spot size measurement are experimentally compared. The two methods use a Ronchi ruling where the transmitted total power and the normally diffracted energy are considered. We show that the beam widths obtained by these methods are very close. The theory of diffraction used is based on the Rayleigh–Sommerfeld integral equation with Dirichlet condition.

Keywords: Diffraction; gratings; Ronchi rulings.

 

Resumen

Comparamos experimentalmente dos métodos para la determinación del ancho de una haz gauseano. Los dos métodos emplean una red de difracción de Ronchi donde se considera la energía total transmitida y la energía difractada normalmente. La teoría de la difracción utilizada esta basada en la ecuación integral de Rayleigh–Sommerfeld con las condiciones de Dirichlet.

Descriptores: Difracción; redes de difracción; redes de Ronchi.

 

PACS:42.25.Fx;42.10.H.C

 

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Acknowledgment

The authors acknowledge support from Comisión de Operaciones y Fomento de Actividades Académicas del Instituto Politécnico Nacional.

 

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