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Correction of low order aberrations using continuous deformable mirrors
- The authors show that to achieve a high quality correction of low-order aberrations using membrane, bimorph and continuous facesheet mirrors, these mirrors should have sufficient number of actuators positioned outside the correction aperture.
Optics Express 16, 2859-2866 (2008) - Author(s): G. Vdovin, O. Soloviev, A. Samokhin, M. Loktev
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Modal liquid-crystal wavefront corrector on a ceramic substrate: the single-contact approximation
- The possibility of manufacturing a multichannel modal liquid-crystal corrector of a new type based on a ceramic substrate with a high permittivity is confirmed theoretically and experimentally. A mathematical model of the single-electrode corrector is proposed and used to study the dependences of the voltage and phase profiles on the properties of the corrector design. The technology of manufacturing a ceramic substrate with built-in electrodes is developed.
Quantum Electronics 37, 1169-1175 (2007) - Author(s): N. A. Klimov, S. P. Kotova, S. A. Samagin, M. Y. Kvashnin, G. V. Vdovin, M. Y. Loktev
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Adaptive optics for enhanced signal in CARS microscopy
- The authors report the use of adaptive optics with coherent anti-Stokes Raman scattering (CARS) microscopy for label-free deep tissue imaging based on molecular vibrational spectroscopy. The setup employs the 15-mm 37-channel deformable membrane mirror and a random search optimization algorithm to improve signal intensity and image quality at large sample depths. The authors demonstrate the ability to correct for both system and sample-induced aberrations in test samples as well as in muscle tissue in order to enhance the CARS signal. The combined system and sample-induced aberration correction increased the signal by an average factor of ~3x for the test samples at a depth of 700 µm and ~6x for muscle tissue at a depth of 260 µm. The enhanced signal and higher penetration depth offered by adaptive optics will augment CARS microscopy as an in vivo and in situ biomedical imaging modality.
Opt. Express 15, 18209-18219 (2007) - Author(s): A. J. Wright, S. P. Poland, J. M. Girkin, C. W. Freudiger, C. L. Evans, and X. S. Xie
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Direct optimization of femtosecond laser ablation using adaptive wavefront shaping
- The athors introduce an approach based on using an iterative simulated annealing algorithm to drive the outcome of femtosecond laser ablation towards a specific target shape by using a two-dimensional deformable mirror by Flexible Optical B.V. Unlike previous work combining adaptive optics and laser machining the autors use the machining outcome itself as the fitness parameter for the optimization procedure. Single-pulse ablation features with programmable aspect ratios and dimensions as small as 2.5 ?m are faithfully reproduced by the technique in a chromium-on-glass test sample.
J. Opt. A: Pure Appl. Opt. 9, 1100-1104 (2007)
- Author(s): S. Campbell, S.M.F. Triphan, R. El-Agmy, A.H. Greenaway and D.T. Reid
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Liquid crystal wavefront corrector with modal response based on spreading of the electric field in a dielectric material
- A novel liquid crystal (LC) wavefront corrector with smooth
modal influence functions is proposed and realized. The modal character
of the response is determined by spreading of the electric field in a
thick ceramic substrate. The device implemented is operating in a
reflective (mirror) mode; however, similar principles can be used to
build a transmissive device.
Optics Express 15, 2770-2778 (2007)
- Author(s): M. Loktev, G. Vdovin, N. Klimov, S. Kotova
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