Results 161 to 170 of about 3,080 (207)

Testing of thermally piezoelectric deformable mirror with buried functionality

SPIE Proceedings, 2014
Laser-induced mirror deformation and thermal lensing in optical high power systems shall be compensated by a thermally-piezoelectric deformable mirror (DM). In our device, the laser-induced thermal lensing is compensated by heating of the DM as previously described with compound loading.
C. Reinlein, M. Appelfelder, M. Goy, S. Gebhardt, N. Gutzeit   +4 more
openaire   +1 more source

Prototype Small Footprint Amplifier for Piezoelectric Deformable Mirrors

2011
Adaptive Optics (AO) systems of the Extremely Large Telescopes (ELT) will incorporate deformable mirrors with an order of magnitude larger number of piezoelectric actuators than the AO systems currently deployed. Simply scaling up the drive electronics offered commercially would substantially drive up the AO cost, pose unacceptably high demands for the
Caputa, Kris, Herriot, Glen, Niebergal, Joel, Zielinski, Adam   +3 more
openaire   +1 more source

Piezoelectric MEMS deformable mirrors with high-density actuator array

2011 IEEE 24th International Conference on Micro Electro Mechanical Systems, 2011
We fabricated piezoelectric MEMS deformable mirror (DM) with high-density actuator array for adaptive optics to realize low-voltage and high-resolution retinal imaging. 61-element actuator array composed of lead zirconate titanate (PZT) thin film was deposited on the mirror diaphragm, and the diaphragm was deformed by applying control voltage onto the ...
M. Sato, I. Kanno, H. Kotera, O. Tabata
openaire   +1 more source

Requirements for piezoelectric materials for deformable mirrors

Ferroelectrics, 1980
Abstract Deformable mirrors to correct wavefront errors in real time have emerged as a key component in adaptive optical systems being developed for a variety of applications. Piezoelectric materials, particularly lead zinconate titanate have proven to be the most desirable actuators for high speed, high element density, electrically controlled mirrors.
openaire   +1 more source

Eliminating hysteresis of piezoelectric deformable mirror by charge control

Optics Communications, 2015
Inherent hysteresis of piezoelectric deformable mirror (DM) limits the performance of adaptive optics (AO) systems including bandwidth and residual wavefront error. A charge control method based on switched capacitor charge pump was proposed to eliminate the hysteresis of piezoelectric DM.
Jianqiang Ma, Junjie Chen, Yanlei Hu, Lei Tian, Baoqing Li, Jiaru Chu   +5 more
openaire   +1 more source

Optimization of mirror deformation strategy using mechanical and piezoelectric bending system

Advances in X-Ray/EUV Optics and Components XVI, 2021
We have developed an X-ray zoom condenser optical system using deformable mirrors that can adjust the beam size by deformation of their shape. The shapes of deformable mirrors are changed by a combination of mechanical and piezoelectric bending. Large deformations up to third order polynomials are achieved by mechanical bending. More precise shapes are
Takato Inoue, Yuka Nishioka, Satoshi Matsuyama, Junki Sonoyama, Kazuteru Akiyama, Hiroki Nakamori, Yasuhisa Sano, Yoshiki Kohmura, Makina Yabashi, Tetsuya Ishikawa, Lahsen Assoufid, Kazuto Yamauchi   +11 more
openaire   +1 more source

A piezoelectric deformable mirror for intra-cavity laser adaptive optics

SPIE Proceedings, 2008
This paper describes the development of a deformable mirror to be used in conjunction with diffractive optical elements inside a laser cavity. A prototype piezoelectric unimorph adaptive mirror was developed to correct for time dependent phase aberrations to the laser beam, such as those caused by thermal expansion of materials.
Craig S. Long, Philip W. Loveday, Andrew Forbes   +2 more
openaire   +1 more source

Piezoelectric PVDF actuated, lightweight deformable thin mirror for adaptive optics

2016 International Conference on Optical MEMS and Nanophotonics (OMN), 2016
We present a light-weight deformable concept based on film-form glass and piezoelectric PVDF films compatible with a roll-to-roll compatible fabrication process. The feasibility of the approach is demonstrated through FEA simulations.
Kaustubh Banerjee, Pouya Rajaeipour, Caglar Ataman, Hans Zappe   +3 more
openaire   +1 more source

Experimental and simulation study of undesirable short-period deformation in piezoelectric deformable x-ray mirrors

Review of Scientific Instruments, 2012
To construct adaptive x-ray focusing optics whose optical parameters can be varied while performing wavefront correction, ultraprecise piezoelectric deformable mirrors have been developed. We computationally and experimentally investigated undesirable short-period deformation caused by piezoelectric actuators adhered to the substrate during mirror ...
Nakamori, Hiroki, Matsuyama, Satoshi, Imai, Shota, Kimura, Takashi, Sano, Yasuhisa, Kohmura, Yoshiki, Tamasaku, Kenji, Yabashi, Makina, Ishikawa, Tetsuya, Yamauchi, Kazuto   +9 more
openaire   +3 more sources

Modelling and analysis of circular bimorph piezoelectric actuator for deformable mirror

Applied Mathematics and Mechanics, 2016
A theoretical model of a circular flexure-mode piezoelectric bimorph actuator is established. The circular bimorph structure, consisting of two flexible layers of piezoelectric material and a layer of metallic material in the middle, is powered to the flexural deformation.
Hairen Wang, Ming Hu, Zhenqin Li
openaire   +1 more source