Dual-beam dual-frequency scanning laser radar for investigation of ablation profiles

Vasyl V. Molebny; Ioannis G. Pallikaris; Leonidas P. Naoumidis; Gary W. Kamerman; Eugene M. Smirnov; Leonid M. Ilchenko; Vadym O. Goncharov

doi:10.1117/12.243574

26 June 1996 Dual-beam dual-frequency scanning laser radar for investigation of ablation profiles

Vasyl V. Molebny, Ioannis G. Pallikaris, Leonidas P. Naoumidis, Gary W. Kamerman, Eugene M. Smirnov, Leonid M. Ilchenko, Vadym O. Goncharov

Author Affiliations +

Proceedings Volume 2748, Laser Radar Technology and Applications; (1996) https://doi.org/10.1117/12.243574
Event: Aerospace/Defense Sensing and Controls, 1996, Orlando, FL, United States

Abstract

High-quality eye treatment needs sophisticated and accurate instrumentation for cornea profile measurement before and after laser ablation. Plastic PMMA specimens are in ordinary use for pre-operational adjustment of laser intensity distribution, supposed that the results of the cornea surface ablation and the ablation of the plastic surface are identical. We investigated dual-beam technique for path- difference measurement of two laser beams, reflected from two neighboring points of the surface to be measured. The beams are frequency shifted relative to each other. Interference in the plane of receiver gives differential frequency, its phase being dependent on path difference. Acousto-optical scanning results in 2D distribution of path difference. To get surface profiles, along-line videosignals undergo the mathematical operation of integration. The sensitivity of several nanometers was got to flat specimens. For convenience of image processing and visualization, TV type scanning is applied to laser beams.

Citation Download Citation

Vasyl V. Molebny, Ioannis G. Pallikaris, Leonidas P. Naoumidis, Gary W. Kamerman, Eugene M. Smirnov, Leonid M. Ilchenko, and Vadym O. Goncharov "Dual-beam dual-frequency scanning laser radar for investigation of ablation profiles", Proc. SPIE 2748, Laser Radar Technology and Applications, (26 June 1996); https://doi.org/10.1117/12.243574

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