In this work, two advanced technologies were applied for manufacturing a bimorph wavefront corrector: laser ablation, to vaporize conductive silver coating from piezoceramic surface, and parallel-gap resistance microwelding, provide reliable electrical contact between the piezodisk surface electrodes copper wires. A step-by-step guide mirror production is presented, together with ‘bottlenecks’. Optimization of ablation technique was carried out using an Nd:YAG output power 4 W frequency 20...

The hybrid model for analyzing distortions of a laser beam passed through moderately scattering medium with the number events up to 10 is developed and investigated. implemented Monte Carlo technique simulate propagation layer, ray-tracing propagate scattered measurements plane, Shack–Hartmann calculate distortions. results obtained from were confirmed during laboratory experiment. Both numerical experiment showed that an increase concentration value particles in range 105 106 mm−3,...

The bimorph deformable mirror with a diameter of 320 mm, including 127 control electrodes, has been developed and tested. flatness the initial surface about 1 μm (P-V) was achieved by mechanically adjusting substrate fixed in metal mount. To correct for aberrations improve beam focusing petawatt Ti:Sa laser, wide-aperture adaptive optical system Shack–Hartmann wavefront sensor developed. Correction 4.2 PW laser using provided increases intensity plane to value 1.1 × 1023 W/cm2

Atmospheric turbulence causes refractive index fluctuations, which in turn introduce extra distortions to the wavefront of propagated radiation. It ultimately degrades telescope resolution (in imaging applications) and reduces radiation power density focusing applications). One possible ways researching impact is numerically simulate spectrum reproduce it using a corrector measure resultant using, for example, Shack–Hartmann sensor. In this paper, we developed simulator software that...

To correct for phase distortions in high-power laser setups a stacked-actuator deformable mirror with water cooling was developed. The main characteristics of the such as initial surface profile, response functions actuators, maximal stroke and amplitude frequency characteristic were shown. quality equal to 0.14 µm (P-V). about 7 µm. first resonant found at 18.5 kHz, that would allow exploit wavefront corrector high-speed adaptive optical systems. measured hysteresis 12%. Experimental...

Abstract This paper reports a large-aperture adaptive optical system with bimorph deformable mirror and Shack – Hartmann wavefront sensor for aberration correction beam focusing improvement in state-of-the-art petawatt Ti : sapphire lasers. We consider methods providing feedback to the obtaining an objective that optimises onto target. The use of controlled 127-channel 320-mm-aperture laser output power 4.2 PW has made it possible obtain record high intensity: 1.1 × 10 23 W cm −2 .

The rarely considered case of laser beam propagation and focusaing through the moderately scattering medium was researched. A phase-only spatial light modulator (SLM) with 1920×1080 pixel resolution used to increase efficiency focusing radiation propagated 5 mm layer suspension 1 µm polystyrene microbeads in distilled water concentration values ranging from 105 106 mm−3. CCD camera micro-objective estimate intensity distribution far-field focal spot. Shack-Hartmann sensor measure wavefront...

This paper presents a FPGA-based closed-loop adaptive optical system with bimorph deformable mirror for correction of the phase perturbation caused by artificial turbulence. The system’s operating frequency about 2000 Hz is, in many cases, sufficient to provide real-time mode. results wavefront laser radiation distorted airflow formed laboratory conditions help fan heater are presented. For detailed consideration, expansion Zernike polynomials is used further statistical analysis based on...

The results of a study the wavefront distortions laser radiation caused by artificial turbulence obtained in laboratory conditions using fan heater are presented. Decomposition terms Zernike polynomials is standard procedure that traditionally used to investigate set existing aberrations. In addition, spectral analysis dynamics makes it possible estimate fraction energy distributed between different modes. It shown related low-order higher compared high-order polynomials. Also, one...

This article presents a study of the electrophysical properties piezoceramic material for use in adaptive optics. The key characteristics that may be important manufacturing piezoelectric deformable mirrors are following: constants (d31, d33, d15), capacitance, elastic compliance values s different crystal directions, and dielectric loss tangent (tgδ). Based on PZT ceramics, PKP-12 was developed with high constant, modulus, electromechanical coupling coefficients. mirror control elements...

Atmospheric turbulence causes refractive index fluctuations that introduce extra distortions to the wavefront of propagated radiation. It degrades resolution telescope for imaging applications and reduces radiation power density in focusing applications. One possible ways research impact is numerically simulate spectrum fluctuations, reproduce it using a corrector measure resultant Shack-Hartmann sensor. In this paper, we developed simulator software generates sequence phase screens with...

Bimorph deformable mirror with 63 electrodes on 20 mm aperture is discussed. Methods of dividing all round electrode into sectors a square 2-4 mm2 are described. Results flat-top beam formation by means 50 bimorph 48 and miniature 27 presented.

Deformable mirrors are vital components of any adaptive optical system. Considering such a crucial role in compensation incident wavefront distortions, the main requirements imposed on these elements that determine performance entire To correct for phase distortions high-power laser complexes stacked-actuator deformable mirror with water cooling was developed. The characteristics mirror, as initial surface profile (flatness), response functions actuators, maximal stroke, and...

For laser beam control in different scientific and industrial tasks adaptive optics tools are widely exploited. Any optical system parameters mainly determined by wavefront corrector properties such as stroke, operating speed, resolution of elements, accuracy performances. Stack-array deformable mirror made multilayer piezoceramic combs is proposed low-cost reliable alternative to conventional ones. Such design allows increase spatial first resonant frequency. Moreover, mirrors will be...

Thermal effects in the active laser medium influence on quality of beam high-power systems. Temperature fluctuations lead to refractive index modulation medium, thus intensity radiation is significantly reduced. Historically, solve this task an adaptive optics technique used. It allows compensate for wavefront aberrations. Stacked-actuator deformable mirror a traditional technology that used order improve incident wavefront. This type correctors has one significant shortcoming –...

High-power laser systems are widely used for technological purposes or fusion experiments, but also to deliver the energy some remote places here on Earth as well in space. Probably only instrument improve phase structure of beam is use methods and elements adaptive optics. The heart any optical system course deformable mirror. That why research development such continues many years already. Here we propose a new stacked actuator mirror be correct not just turbulent fluctuations, it should...

Formation and correction of the given laser beam intensity phase is an important practical scientific problem. Semipassive bimorph flexible mirror one most widely used devices for this purpose. But key disadvantage these kind mirrors their low spatial resolution corrected phase. Mainly problem occurs when deals with small aperture wavefront correctors. In work we present two approaches to overcome – use a multilayer (multimorph) another put higher density control electrodes special technique...

As well known, the quality of radiation laser beam is reduced during propagation along optical trace, because various reasons (for example, atmospheric turbulence, scattering, thermal fluctuations etc.). We propose small-size deformable mirrors with high spatial resolution control elements, that will allow to compensate for wavefront aberrations in wide range. Developed corrector could be used different scientific areas: free-space communications, destruction space debris, etc.

Laser beam propagated through surface layers of the atmosphere changes its properties under influence turbulence effect. To mitigate consequences adaptive optics tools are widely used. In this paper optimization main parameters (stroke, first resonance frequency, substrate and piezoplate thicknesses) bimorph wavefront corrector was performed considering severe atmospheric conditions (refractive index structure constant C_n²=10^-13 m^-2/3, length trace...

Stacked-array deformable mirror is one of the most popular tools for correction wavefront aberrations. We manufactured stacked-array with small diameter by using piezoceramic combs few actuators on them. In this case aperture will be equal to 30 mm. The stroke such would about 5 microns. thickness substrate 1 Developed mirrors suitable fast adaptive optical systems radiation transferring through turbulent atmosphere tasks.

Deformable mirrors in adaptive system for high power lasers should have damage threshold and thermally stabilized surface. The cooling is required average beam above 100W. In this paper, the problem of thermo-stabilizing deformable studied. Bimorph (BDM) stack actuator (SADM) are considered. For BDMs active passive designs been implemented. design, waffletype circulation liquid was made inside thin substrate. periphery surface contacted with condenser which temperature constant. Such not...

A multispectral wavefront sensor can be used to perform a single-shot spatio-temporal characterization of laser pulse. In order measure the spatio-spectral electric field, pulse spectrally modulated, separated and measured by sensor. simplify experimental setup hardware control, single used. this research we discuss development multi-channel wide-aperture high-resolution Shack-Hartmann for sensing. The whole area 15×15 mm was divided into four logical apertures, each separate beam....