Picometer-Resolution MEMS Segmented DM

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$100,000.00
Award Year:
2011
Program:
SBIR
Phase:
Phase I
Contract:
NNX11CE94P
Award Id:
n/a
Agency Tracking Number:
104554
Solicitation Year:
2010
Solicitation Topic Code:
S2.02
Solicitation Number:
n/a
Small Business Information
CA, Berkeley, CA, 94704-1717
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
120364380
Principal Investigator:
MichaelHelmbrecht
Principal Investigator
(510) 849-2375
michael.helmbrecht@irisao.com
Business Contact:
MichaelHelmbrecht
Business Official
(510) 849-2375
michael.helmbrecht@irisao.com
Research Institute:
Stub




Abstract
Microelectromechanical systems (MEMS) technology has the potential to create deformable mirrors (DM) with 10^4 actuators that have size, weight, and power specifications that are far lower than conventional piezoelectric and electrostrictive DMs. However, building a MEMS DM with a relatively large aperture that is flat in the unpowered state is challenging. Currently, a large portion of the mirror stroke must be used to flatten the MEMS DMs and in some cases, the DM stroke is not even sufficient to flatten the mirror. In the case of the large-stroke segmented MEMS DMs manufactured by Iris AO, there is sufficient stroke for wavefront correction after flattening. However, the resolution is significantly reduced because the dynamic range of the digital-to-analog converters (DAC) used to operate the DM is spread over multiple microns of stroke rather than the 0.5µm range required to correct for aberrations in the telescope that feeds the coronagraph. This Phase I SBIR will make substantial improvements in the fabrication process of MEMS segmented DMs that reduce the deleterious residual surface-figure errors. It will do so by systematically addressing the sources of the segment position variations as well as addressing low-spatial frequency chip bow that can result in large peak-to-valley deformations across the DM array. The Iris AO DM architecture will also be modified to enable picometer resolution actuation with ultra-precision drive electronics.

* information listed above is at the time of submission.

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