Deformable mirrors for high power lasers
OKO introduces a line of laser deformable mirrors (DM). These DMs feature highly reflective coatings with reflectivity of up to 99.998%, for the most frequently used laser wavelengths of 1060 nm, 530 nm, and any other wavelength in the range of 250 to 2500 nm. The standard DMs have light aperture of 30mm and 50mm, and can have 18,19 and 37 actuators (30 and 50mm diameter), and also 59, 69, 79 and 109 actuators (50mm diameter). Mirrors can work with continuous laser loads of up to tens of kW. The power handling ability is enchanced by active cooling of the mirror structure with embedded cooling fan.
Bipolar high-voltage amplifier
OKO introduces Bipolar DC HV amplifier. The unit has 8 independent channels with a gain of 50, each producing output in the range of -300 to +300 V. These amplifiers are designed to drive piezoelectric tube actuators and tip-tilt stages. Application include adaptive optics, beam control, and scanning microscopes. The module features compact 40 × 200 × 280 mm size, weight of 1,2 kg, 30 W energy consumption, and works in any country with AC power supply in the range from 85 to 250 V. Full signal response is linear from DC to 9 kHz on a 200 pF load, from DC to 4 kHz on a 4 nF load and from DC to 700 Hz on a 22 nF load. The delay between the input and the output, does not exceed 30 μs, with a 200 pF loads.
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.