Continuous photocontrolled deformable membrane mirror

Abstract

We present a deformable mirror that is composed by a metalized membrane with a monolithic nonpixelated photoconductive Bi12SiO20 substrate. The assembly constitutes a continuous photocontrolled deformable mirror and is driven through suitable light intensity distributions illuminating the photoconductive element. The continuous deformation of the reflective surface provides an all-optical and dynamical control of the incoming wave front, without spatial segmentation and with a deformation as large as a few microns.

Fully Organic Photocontrolled Deformable Mirror

“…As a first test, the membrane displacement has been evaluated under uniform illumination. In such condition, a uniform electrostatic pressure is generated and a parabolic deformation of the membrane is induced, hence only a defocus in the wavefront is expected. The membrane displacement was evaluated as a function of the light intensity at 525 nm and of the applied DC bias.…”

“…This implementation of deformable mirrors shows numerous advantages in terms of actuation spatial frequency, simplification of the driving technology, versatility of operation, and lightweight. At the state of the art, PCDMs have been realized using crystalline inorganic photoconductors such as gallium arsenide, bismuth silicon oxide and, more recently, zinc selenide . Inorganic crystals however, suffer from limited scalability and high cost.…”

Optimization of low-order harmonic generation by exploitation of a resistive deformable mirror

“…Each of the mentioned applications has specific requirements depending on correction speed, system stability, amount and resolution of the correction and beam dimensions. For these reasons recent works report on the realization of many different DM technologies [9] in order to address a higher stroke [10], speed [11], and a higher resolution [11,12]. Experiments in astronomy require a fast correction to reduce the impact of atmospheric turbulence on image quality, thus a Wave Front sensor (WFs) is necessary.…”

Innovative Membrane Deformable Mirrors

“…A new type of membrane DM is made by associating a metalized membrane with a monolithic non-pixelated photoconductive substrate (Bortolozzo et al, 2010). The assembly constitutes a continuous photo-controlled deformable mirror (PCDM), which is driven by sending suitable light intensity distributions onto its photoconductive side, opposite to the reflection side.…”

“…However, the use of DM's in these experiments differs case by case: in fact, each experiment has its own specific requirements depending on correction speed, system stability, amount and resolution of the correction and beam size. For this, recent researches report on the realization of many different DM www.intechopen.com Topics in Adaptive Optics 232 technologies (Dalimier & Dainty, 2005) in order to address either higher stroke , or higher resolution (Bifano, 2011;Bortolozzo et al, 2010), or different shapes.…”