LIL filtering lenses back focus length absolute measurement

Jean-Christophe Poncetta; Vincent Beau; Genevieve Chabassier; Jacques F. Rodolfo; Remi Bourgois; C. Hurst; Francois Houbre

doi:10.1117/12.530105

19 November 2003 LIL filtering lenses back focus length absolute measurement

Jean-Christophe Poncetta, Vincent Beau, Genevieve Chabassier, Jacques F. Rodolfo, Remi Bourgois, C. Hurst, Francois Houbre

Author Affiliations +

Proceedings Volume 4829, 19th Congress of the International Commission for Optics: Optics for the Quality of Life; (2003) https://doi.org/10.1117/12.530105
Event: 19th Congress of the International Commission for Optics: Optics for the Quality of Life, 2002, Florence, Italy

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.

Citation Download Citation

Jean-Christophe Poncetta, Vincent Beau, Genevieve Chabassier, Jacques F. Rodolfo, Remi Bourgois, C. Hurst, and Francois Houbre "LIL filtering lenses back focus length absolute measurement", Proc. SPIE 4829, 19th Congress of the International Commission for Optics: Optics for the Quality of Life, (19 November 2003); https://doi.org/10.1117/12.530105

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