Share Email Print
cover

Proceedings Paper

LIL filtering lenses back focus length absolute measurement
Author(s): Jean-Christophe Poncetta; Vincent Beau; Genevieve Chabassier; Jacques F. Rodolfo; Remi Bourgois; C. Hurst; Francois Houbre
Format Member Price Non-Member Price
PDF $17.00 $21.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

As part of the LIL (Ligne d'Integration Laser) and LMJ (Laser Megajoule) projects, CEA/CESTA and SAGEM company have carried out an accurate metrology of the back focus length of filtering lenses. These measurements should enable us to make up for a lack of focus adjustment on the laser and to correctly position these lenses. Three different lenses have been characterized: • Lenses L1 and L2 with a back focus length of 10 m (aperture of F/16). Uncertainty is estimated at ±1,3 mm. • Lens L3 with a back focus length of 26 m (aperture of F/43). Uncertainty is estimated at ±5,3 mm. To achieve these measurements, 4 methods have been used: (1) Measurement of the curvature radius of each side on a Coordinate Measuring Machine and index homogeneity characterization before polishing. (2) Interferometric measurement with a reference spherical mirror. (3) Interferometric measurement using a lens side as a reference spherical mirror with a flat mirror. (4) Interferometric measurement by closing the cavity at the top of the lens back side. Uncertainty calculation has been done for each method.

Paper Details

Date Published: 19 November 2003
PDF: 2 pages
Proc. SPIE 4829, 19th Congress of the International Commission for Optics: Optics for the Quality of Life, (19 November 2003); doi: 10.1117/12.530105
Show Author Affiliations
Jean-Christophe Poncetta, Commissariat a l'Energie Atomique (France)
Vincent Beau, Commissariat a l'Energie Atomique (France)
Genevieve Chabassier, Commissariat a l'Energie Atomique (France)
Jacques F. Rodolfo, REOSC (France)
Remi Bourgois, REOSC (France)
C. Hurst, REOSC (France)
Francois Houbre, REOSC (France)


Published in SPIE Proceedings Vol. 4829:
19th Congress of the International Commission for Optics: Optics for the Quality of Life
Giancarlo C. Righini; Anna Consortini, Editor(s)

© SPIE. Terms of Use
Back to Top