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Hartmann wavefront sensor based on multielement amplitude masks with apodized apertures
A.G. Poleshchuk, A.G. Sedukhin, V.I. Trunov,V.G. Maksimov

 

Institute of Automation and Electrometry, SB RAS, Novosibirsk,
Institute of Laser Physics SB RAS, Novosibirsk,
Institute of Monitoring of Climatic and Ecological Systems, SB RAS, Tomsk

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Full text of article: Russian language.

DOI: 10.18287/0134-2452-2014-38-4-695-703

Pages: 695-703.

Abstract:
A theoretical and experimental study of a Hartmann sensor intended for measurements of light beam wavefronts and implemented on the basis of multielement amplitude masks with apodized apertures is presented. We perform a comparative analysis of the optical performance of the amplitude masks with hard-edge circular apertures and half-tone masks (HTMs) with apodized apertures forming smooth fast decaying optical responses on a photosensor. A technique for fabricating chromium HTMs is developed, which is based on laser thermochemical method of recording. This technique includes two main stages: first – the exposure of a chromium film by a focused laser beam, whose power is varied in a smooth and nonlinear manner versus the required density of HTM’s structure, and second – the developing of the film in a selective etcher. Specimens of HTMs consisting of 64×64 Gaussian apertures were fabricated and applied in a modified Hartmann sensor to measure the wavefront of powerful laser systems.

Key words:
wavefront sensor, Hartmann sensor, apodization, continuous-tone laser recording.

Citation:
Poleshchuk AG, Sedukhin AG, Trunov VI, Maksimov V.G. Hartmann wavefront sensor based on multielement amplitude masks with apodized apertures. Computer Optics 2014; 38(4): 695-703. DOI: 10.18287/0134-2452-2014-38-4-695-703.

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