Design and prototype performance of an innovative cryogenic tip-tilt mirror

Janssen, H.; Teuwen, Maurice; Navarro, Ramón; Tromp, Niels; Elswijk, Eddy; Hanenburg, Hiddo

doi:10.1117/12.856585

Cited by 9 publications

(3 citation statements)

References 4 publications

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“…It is also worth noting that bimorph correctors are not able to create sufficient deformation to compensate for wavefront tip-tilt aberrations, which have a large amplitude and make a significant contribution to the overall distortion of the wavefront, therefore, from this point of view, it is more expedient to use piezoactuator wavefront correctors, but since the amplitudes of the tip-tilt are large enough, it is reasonable to use additional devices to correct them [22,39,40] .…”

Section: Comparison Of Modified Piezoelectric Mirrorsmentioning

confidence: 99%

Deformable piezoelectric mirrors with high density of control elements

Toporovsky¹,

Kudryashov

Sheldakova³

et al. 2022

28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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We have developed three types of deformable piezoelectric mirrors with a high density of control elements to compensate for the aberrations of the wavefront of high-power laser radiation that has passed through a turbulent atmosphere: bimorph and piezoactuator types. When creating correctors of the first type, laser engraving and microwelding methods were used, which made it possible to create a 30 mm bimorph mirror with 37 electrodes, compensated for wavefront aberrations up to the 7th order of the Zernike polynomials. The design of the piezoactuator mirrors provided for the possibility of replacing the piezoelectric stacks in the event of their failure, as well as thermal stabilization of the corrector's reflective substrate through the body of the actuators. Main parameters of all types deformable mirrors were investigated and compared.

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Section: Comparison Of Modified Piezoelectric Mirrorsmentioning

confidence: 99%

Deformable piezoelectric mirrors with high density of control elements

Toporovsky¹,

Kudryashov

Sheldakova³

et al. 2022

28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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“…They are divided into devices with a continuous [15] and segmented [16] reflective surface. According to the principle of operation, they can be divided into: mechanical [17] , membrane [18], MEMS [19] , magnetostrictive [20] , thermally deformable [21] , piezostack [22][23][24][25] , bimorph [26][27][28][29][30][31][32][33] , combined mirrors (using several technologies simultaneously) [34,35] , as well as liquid crystal light modulators [36] , devices with a matrix of micromirrors (DMD technology) [37] or simple tip-tilt stages [38][39][40][41] . Every part of the correction system (wavefront sensor, wavefront corrector, control unit) impact on the error budget of the system [42][43][44] .…”

Section: Introductionmentioning

confidence: 99%

Wavefront control with high-spatial cartridge-type piezostack deformable mirror

Toporovsky,

Galaktionov,

Samarkin

et al. 2023

Laser Beam Shaping XXIII

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To increase the cost-effectiveness of the piezostack deformable mirror we proposed to use the modular design of such wavefront correctors. Each module contains 5 individual multilayer actuators with size of 4*4 mm. The performance of 50*50 mm cartridge-type piezostack deformable mirror with 100 control elements was investigated. Main parameters of the developed wavefront corrector were estimated such as the local stroke, influence functions, the control bandwidth.

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“…Once aligned the mechanism shall maintain its position powerless during operation. A design for this mechanism has been developed and tested [3]. Distinctive characteristics of the concept are: -The concept enables to implement large reduction between actuator input movement and mirror output movement.…”

Section: A Tip-tilt Mirror Mechanismmentioning

confidence: 99%

Precision mechanisms for optics in a vacuum cryogenic environment

Navarro

Elswijk

Tromp

et al. 2017

International Conference on Space Optics — ICSO 2010

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To achieve superb stability in cryogenic optical systems, NOVA-ASTRON generally designs optical instruments on the basis of a 'no adjustments' philosophy. This means that in principle no corrections are possible after assembly. The alignment precision and consequently the performance of the instrument is guaranteed from the design, the tolerance analysis and the detailed knowledge of the material behavior and manufacturing process. This resulted in a higher degree of integrated optomechanical-cryogenic design with fewer parts, but with a higher part complexity. The 'no adjustments' strategy is successful because in the end the risk on instrument performance and project delays is much reduced. Astronomical instrument specifications have become more challenging over the years. Recent designs of the European Southern Observatory Very Large Telescope Interferometer (ESO VLTI) 4 Telescope combiner MATISSE include hundreds of optical components in a cryogenic environment. Despite the large number of optical components the alignment accuracy and stability requirements are in the order of nanometers. The 'no adjustments' philosophy would be too costly in this case, because all components would need to meet extremely tight manufacturing specifications. These specifications can be relaxed dramatically if cryogenic mechanisms are used for alignment. Several mechanisms have been developed: a tip-tilt mirror mechanism, an optical path distance mechanism, a slider mechanism, a bistable cryogenic shutter and a mirror mounting clip. Key aspects of these mechanisms are that the optical element and mechanism are combined in a compact single component, driven by e.g. self braking piezo actuators in order to hold position without power. The design, realization and test results of several mechanisms are presented in this paper.

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Design and prototype performance of an innovative cryogenic tip-tilt mirror

Cited by 9 publications

References 4 publications

Deformable piezoelectric mirrors with high density of control elements

Deformable piezoelectric mirrors with high density of control elements

Wavefront control with high-spatial cartridge-type piezostack deformable mirror

Precision mechanisms for optics in a vacuum cryogenic environment

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