Research on the optimization of a bimorph piezoelectric deformable mirror based on zeroth-order method

2016 ◽  
Author(s):  
Hairen Wang ◽  
Lin Hu
Keyword(s):  
Deformable Mirror ◽  
Order Method ◽  
Zeroth Order

scholarly journals A zeroth order method for stochastic weakly convex optimization

2021 ◽  
Author(s):  
V. Kungurtsev ◽  
F. Rinaldi
Keyword(s):  
Convex Optimization ◽  
Optimization Problems ◽  
State Of The Art ◽  
Similar Rate ◽  
Numerical Results ◽  
Order Method ◽  
Zeroth Order ◽  
Weakly Convex ◽  
Convex Optimization Problems ◽  
Derivative Free

AbstractIn this paper, we consider stochastic weakly convex optimization problems, however without the existence of a stochastic subgradient oracle. We present a derivative free algorithm that uses a two point approximation for computing a gradient estimate of the smoothed function. We prove convergence at a similar rate as state of the art methods, however with a larger constant, and report some numerical results showing the effectiveness of the approach.

Large-aperture deformable mirror correction of tiled-grating wavefront error

2006 ◽  
Vol 133 ◽  
pp. 645-648 ◽  
Author(s):  
B. E. Kruschwitz ◽  
R. Jungquist ◽  
J. Qiao ◽  
S. Abbey ◽  
S. E. Dean ◽  
...  
Keyword(s):  
Deformable Mirror ◽  
Large Aperture ◽  
Wavefront Error

Oblique-incidence Reflectivity Difference (OI-RD) and Leed Studies of Adsorption and Growth of Xe on Nb(110)

2003 ◽  
Vol 780 ◽  
Author(s):  
P. Thomas ◽  
E. Nabighian ◽  
M.C. Bartelt ◽  
C.Y. Fong ◽  
X.D. Zhu
Keyword(s):  
Transition Layer ◽  
Layer Growth ◽  
Flow Mode ◽  
Layer By Layer ◽  
Zeroth Order ◽  
Step Flow ◽  
Low Energy Electron Diffraction ◽  
Oriented Film ◽  
Low Energy Electron

AbstractWe studied adsorption, growth and desorption of Xe on Nb(110) using an in-situ obliqueincidence reflectivity difference (OI-RD) technique and low energy electron diffraction (LEED) from 32 K to 100 K. The results show that Xe grows a (111)-oriented film after a transition layer is formed on Nb(110). The transition layer consists of three layers. The first two layers are disordered with Xe-Xe separation significantly larger than the bulk value. The third monolayer forms a close packed (111) structure on top of the tensile-strained double layer and serves as a template for subsequent homoepitaxy. The adsorption of the first and the second layers are zeroth order with sticking coefficient close to one. Growth of the Xe(111) film on the transition layer proceeds in a step flow mode from 54K to 40K. At 40K, an incomplete layer-by-layer growth is observed while below 35K the growth proceeds in a multilayer mode.

Study and manufacture of a novel micro-deformable mirror

2003 ◽  
Author(s):  
Hongbin Yu ◽  
Haiqing Chen ◽  
Zimin Zhu ◽  
Chao Wang ◽  
Dacheng Zhang ◽  
...  
Keyword(s):  
Deformable Mirror

Routing Optimization with Efficient Second Order Distributed Approach Using Congestion Control Rules

2017 ◽  
Vol 7 (7) ◽  
pp. 363
Author(s):  
Jaya Pratha Sebastiyar ◽  
Martin Sahayaraj Joseph
Keyword(s):  
Congestion Control ◽  
Second Order ◽  
Back Pressure ◽  
Order Method ◽  
Delay Performance ◽  
Routing Optimization ◽  
Distributed Approach ◽  
Control Rules ◽  
Primal Dual ◽  
Queue Stability

Distributed joint congestion control and routing optimization has received a significant amount of attention recently. To date, however, most of the existing schemes follow a key idea called the back-pressure algorithm. Despite having many salient features, the first-order sub gradient nature of the back-pressure based schemes results in slow convergence and poor delay performance. To overcome these limitations, the present study was made as first attempt at developing a second-order joint congestion control and routing optimization framework that offers utility-optimality, queue-stability, fast convergence, and low delay.  Contributions in this project are three-fold. The present study propose a new second-order joint congestion control and routing framework based on a primal-dual interior-point approach and established utility-optimality and queue-stability of the proposed second-order method. The results of present study showed that how to implement the proposed second-order method in a distributed fashion.

Correcting for Spherical Aberrations in Solid Immersion Microscopy Using a Deformable Mirror

2011 ◽  
Author(s):  
Y. Lu ◽  
E. Ramsay ◽  
C. Stockbridge ◽  
F. H. Koklu ◽  
A. Yurt ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Error Correction ◽  
Deformable Mirror ◽  
Wafer Thickness ◽  
Wavefront Error ◽  
Substrate Wafer ◽  
Thickness Error

Abstract We present a method for correcting spherical aberrations in solid immersion microscopy through the use of a deformable mirror. Aberrations in solid immersion imaging for failure analysis can be induced through off-axis imaging, errors in lens fabrication or mismatch of design and substrate wafer thickness. RMS wavefront error correction of 30% is demonstrated in the case of substrate wafer thickness error.

Optimized design of high efficient voice coil actuator in deformable mirror

2020 ◽  
Vol 35 (11) ◽  
pp. 1110-1119
Author(s):  
Shuo CAO ◽  
◽  
Zhi-gao ZHANG ◽  
Zhi-yun ZHAO ◽  
Hu GU ◽  
...  
Keyword(s):  
Deformable Mirror ◽  
Optimized Design ◽  
High Efficient ◽  
Voice Coil Actuator
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