Magnetostrictive actuators in optical design

Аполлонов, В. В.; Aksinin, V. I.; Chetkin, S. A.; Kijko, Vadim V.; Muraviev, Sergue V.; Vdovin, Gleb

doi:10.1117/12.51208

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…But it turned out that there is still room for improve-ment in high power optics. By changing the coolant pressure, one can make it boil at room temperature [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35], i.e., in the same conditions under which the final optical machining of the mirror surface is carried out. When the coolant boils, a portion of the absorbed heat is spent on vapor formation; therefore, the heat exchange is tens or hundreds of times higher than in the case of the convective heat exchange.…”

Section: Mirror Surfacementioning

confidence: 99%

High power optics and its new manifestations

Аполлонов¹

2013

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The advent of the laser has placed stringent requirements on the fabrication, performance and quality of optical elements employed within systems for most practical applications. Their high power performance is generally governed by three distinct steps, firstly the absorption of incident optical radiation (governed primarily by various absorption mechanisms); secondly, followed by a temperature increase and response governed primarily by thermal properties and finally the elements thermo-optical and thermomechanical response, e.g., distortion, stress birefringenous fracture, etc. All of which needs to be understood in the design as efficient, compact, reliable and useful for many applications high power systems, under a variety of operating conditions, pulsed and continuous wave, rep-rated or burst mode of varying duty cycles

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Section: Mirror Surfacementioning

confidence: 99%

High power optics and its new manifestations

Аполлонов¹

2013

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Extended bond graph reticulation of magnetostrictive continua

Lee

Moon

Masada

1994

Journal of Applied Physics

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The extended bond graph (EBG) method is used to model the distributed coupled magnetoelastic effects of general magnetostrictive continua. The mechanical and magnetic fields are described in terms of defined displacement and momentum states, and Galerkin’s discretization technique is applied to reticulate the dynamics of the fields into power flows which are defined as the inner products of extended efforts and flows. The power-based EBG descriptions are consistently used to represent the discretized inertia, compliance, reluctance, coupled fields, and external sources of the magnetostrictive continua. The power bonds associated with the multienergetic fields are directed separately to the magnetic and mechanical energetic domains to enforce energy conservation laws. Details of the development of the general formulation for the model are provided. The EBG network model provides a unified way to analyze the coupling effects and dynamics of complex systems using general magnetostrictive continua.

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Modal noninteracting controls for deformable mirrors

Wang¹,

Hadaegh²

Proceedings of IEEE International Conference on Control and Applications

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In this paper, the analytical design of a feedback control system for achieving noninteraction between a finite number of modes of deformable mirrors corresponding to an arbitrary orthonormal basis for the solution space is considered. In this system, each mode can be manipulated independently without affecting the remaining modes. Particular attention is focused on circular deformable mirrors whose modal representation is expressed in terms of Zernike polynomials. Thus, various types of aberrations such as coma, defocus, astigmatism, and distortion can be manipulated independently. Specific results, are obtained for a micromachined circular mirror with electrostatic actuators based on a membrane model. Only static noninteracting feedback control system is considered. The paper concludes with a discussion of the physical implementation of the proposed modal noninteracting control system.

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Magnetostrictive actuators in optical design

Cited by 4 publications

References 3 publications

High power optics and its new manifestations

High power optics and its new manifestations

Extended bond graph reticulation of magnetostrictive continua

Modal noninteracting controls for deformable mirrors

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