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Wavefront Sensorless Adaptive Optics Demonstrator 
Imaging

MEMS
Sensorless AO Demo-I
Sensorless AO Demo-B
Adaptive Optics Kit
Adaptive Optics Whitepapers Adaptive Optics Whitepapers

System Schematic

WS<sup>-</sup>AOD-I Schematic

A complete adaptive optics solution for imaging applications. The Wavefront Sensorless AO Demonstrator Imaging (WS-AOD-I) provides a platform utilizing metric-based wavefront control with BMC MEMS DM technology.  While conventional AO systems perform closed loop DM control using direct measurement of the wavefront as feedback, the metric-based approach uses details in the aberrated light to improve clarity. The system is configured to use a hill climbing algorithm to compensate for wavefront phase errors. 

Principal Functions

By utilizing the included algorithm to manipulate the mirror surface, the mirror compensates for aberrations and converges to an optimal profile. The user has access to the open source code to balance correction capability between maximum signal and minimal time. The system is intended to serve three main purposes:

Introduce Utilize Integrate

Serve as an introduction to wavefront sensorless adaptive optics principles.
By using the system in its current form, the user is able to understand the details involved in properly implementing a metric-based adaptive optics solution on an optical system.

Use the Demonstrator as a stand-alone aberration compensator.  The user can use this system on its own to correct for aberrations inserted into the optical path. By introducing aberrations in the sample stage, the system can be optimized for a multitude of use cases from laser research applications to scanning laser microscopy.

Enable integration of the components into an existing optical system.
The user can integrate the hardware into an existing optical system and utilize the open source software code for metric-based correction.

     

Hardware Description

BMC’s deformable mirror (DM) technology is used as the central component in the WS-AOD-I to compensate for phase aberrations. The BMC DM is a continuous facesheet deformable mirror that is controlled by hysteresis-free electrostatic actuators located on a square grid. The full DM active aperture can be as little as 1.5 mm to as much as 25 mm across. Each actuator can provide up to 5.5 µm of mechanical stroke, which corresponds to about 11 µm of phase control. The electrostatic actuator array is driven using independent high voltage channels with 14-bit resolution. This corresponds to sub-nanometer displacement precision. The drive electronics can provide frame rates of from about 4.6 kHz up to 100 kHz.

  Compact mount
CMOS camera   The narrow-field image used by the controller is attained using a Thorlabs DCC1545M Monochrome CMOS camera. The DCC Series is an ultra-compact and lightweight CMOS camera with 1280 × 1024 px (SXGA) resolution.The DCC Series is comprised from a large, high-quality CMOS sensor with a small pitch of 5.2 µm (monochrome) and 3.2 µm (color). In full frame mode, the maximum frame rate is 25 frames per second; this can be greatly increased by the variable pixel clock, which allows frame rates up to 250 fps at reduced Regions of Interest (ROIs) and sufficient light conditions.

Software Description

WSAOD softwareThe control software for the Wavefront Sensorless Adaptive Optics Demonstrator-Imaging is open source code based in Mathworks MATLAB, and runs on platforms using Windows operating systems. The software interfaces with the deformable mirror drive electronics and CMOS camera via a USB 2.0 connection. The software allows the user to correct for aberrations introduced as well as generate a random aberration using the DM. The closed-loop frame rate measured for the system using the hardware and layout described with a Multi-DM system is 720 Hz

Typical Performance

Air Force taget

Left: Image of Air Force target with aberration applied to the Multi-DM. Right: Image of corrected image. This performance is typical of low perturbation and gain inputs to the SPGD controller.

WS-AOD-I Standard Components

  • BMC deformable mirror*
  • Ultra-bright LED Illumination source
  • Narrow-field CMOS camera
  • Monochrome wide-field CCD camera
  • All optical components for system including lenses, mounts, translation stages, irises, etc.

WS-AOD-I Options

  • Demo-in-a-box Includes:
    National Instruments Labview©-single license
    Full installation with included Dell© PC
  • Fundamentals Kit
    Includes DM, CMOS camera and software only

Customization Opportunity

Quick Quote
The Wavefront Sensorless AO Demonstrator-Imaging is a fully- customizable instrument. BMC can tailor the system for researchers and scientists with existing setups and applications. Please contact us to arrange a meeting to discuss how the WS-AOD-I can be customized for you.
 
 
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