Turbulence simulation module for MATLAB
A new module for generating of Kolmogorov phase screen with different strength is just released. The module integrates smoothly into LightPipes for MATLAB framework and can be used to simulate light propagation under turbulent atmospheric conditions.
Some sample images obtained for different values of Fried's coherence length are shown below (simulation area size 15 cm, Gaussian beam width 8 cm, wavelength is 633 nm, propagation length 2 km, left image without turbulence, others with r0=6 cm, 3 cm, 2cm, 1.5 cm, and 0.5 cm, resp.).
BeamDoctor cleans the beam without a WF sensor
In July 2013 OKO released the BeamDoctor system for the beam quality optimisation. The system is based on the BeamTuner software and can include any OKO deformable mirror. Using only the focal spot image, the software automatically, in a number of iterations, optimizes the control signals to the deformable mirror, to compensate for the static aberration. The BeamDoctor includes: The BeamTuner software, a deformable mirror with appropriate computer interface and drivers, and inexpensive CMOS or CCD camera for the focal spot sensor.
DIGIGLASSES
Flexible Optical BV is one of SME participants in DIGIGLASSES project, developing an innovating sight augmenting tool for visual impaired people. For details and progress, please check the project web site.
StillI: Enhanced imaging in turbulent conditions
OKO extends the capabilities of modern imaging systems by introducing purely software-based system for image stabilization, object tracking, frame integration and multi-frame deconvolution. It offers an almost real time enhanced imaging through turbulent and wavy media. The system works with live video sequences fed via DirectShow (webcam) interface, or from a CMOS or CCD camera. To get the impression, please watch the recordings below, better seen in a full-frame mode. Feel free to contact us with any technical question, or for an offer. The basic configuration of the system is available from stock.
Direct control of Zernike modes using piezo and membrane DM
Direct control of Zernike modes is beneficial in feedforward control algorithms, and in optimization-based adaptive optics, such as laser intracavity AO, adaptive image sharpness control, smart PSF control in microscopy, optimal imaging through turbulence with stochastic optimization, etc. In all these cases the dynamic control of Zernike modes provides for very quick quasi-optimal convergence to the maximum value of the target function.
Here we show a 15 mm 37-channel OKO Micromachined Membrane Deformable Mirror (MMDM) and 30 mm 37-channel Piezoelectric Deformable Mirror (PDM) operated by Zernike polynomials in feedforward control mode. No wavefront sensor is used during the mirror operation. Both mirrors are controlled by our free MiZer software.
MiZer: direct control of Zernike modes
Software application to directly control OKO deformable mirrors with Zernike polynomials.
Adaptive Optics Breadboard
In this article, we show a breadboard setup of a complete closed-loop adaptive optical system that can be used for educational purposes or as a test setup for deformalbe mirrors, wavefront sensors and control software.