A high-power continuous-wave polycrystalline 1% Nd:Y3Al5O12 (Nd:YAG) ceramic rod laser was demonstrated. With 290 W/808 nm diode pumping, cw output of 72 W obtained at 1064 nm. The optical-to-optical conversion efficiency is 24.8%. Thermally induced birefringence properties Nd:YAG also investigated.

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,...

We successfully implemented laser beam wavefront correction on the 200 TW system at Advanced Laser Light Source. Ultra high intensities in excess of 10(20) W/cm(2) have been demonstrated. This is, to our knowledge, first 100 class combine simultaneously ultra intensity, 10(9) pulse contrast ratio and 10 Hz repetition rate.

This paper presents a new development of small-diameter, high-spatial-resolution, semipassive bimorph deformable mirrors to be used in different imaging systems. To manufacture the small control elements, laser engraving technology is used. An ultrasonic welding technique connect wires electrodes (actuators) applied for this kind mirror. The initial flatness mirror surface equals 0.33 μm (P-V) due use substrate polishing after gluing glass piezo disk. We present main parameters these...

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

The deformable mirror with the size of $410~\text{mm}\times 468~\text{mm}$ controlled by bimorph piezoceramic plates and multilayer stacks was developed. results measurements response functions all actuators surface shape are presented in this paper. study a Fizeau interferometer Shack–Hartmann wavefront sensor has shown that it possible to improve flatness down residual roughness $0.033~{\rm\mu}\text{m}$ (RMS). possibility correction aberrations high-power lasers numerically demonstrated.

Problems of constructing an adaptive optical system intended for correcting the wavefront laser radiation that has passed through a turbulent atmosphere are considered. To ensure high-quality correction, frequency discrete should be at least 1 kHz or more. This performance can achieved by using FPGA as main control element system. The results laboratory experiments beam phase fluctuations caused turbulence, produced airflow fan heater, correction means FPGA-based presented. efficiency was...

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...

We report the main parameters of a nine-electrode bimorph piezoelectric adaptive mirror designed to correct low-order aberrations. describe measurements control coefficients for defocus, astigmatism, pure coma, and spherical aberration this temperature stability its profile. The performance simple optical system imaging through laboratory-generated turbulence is investigated. This device suitable small (<1-m-diameter) telescopes nonastronomical applications optics.

A semipassive bimorph mirror is considered as the most promising corrector for low-order and at same time low-cost atmo- spheric adaptive optical systems. Theoretical experimental results of response functions study are presented. simple function histeresis compensation method suggested. The efficiency correct- ing first eight Zernike polynomials with a 17-electrode given. It shown that such can be successfully used to compensate turbulence Kolmogorov spectrum. © 1996 Society Photo-Optical...

The wavefront of the radiation two types from high-power solid-state (Ti:sapphire and Nd:glass) lasers is experimentally studied. measurements are performed using a Shack — Hartmann sensor. technical functional potential this sensor in measuring laser-based schemes demonstrated. results both static dynamic aberrations discussed. estimated dynamics defocus aberration agreement with experimental data.

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...

We describe a novel scheme consisting of two deformable bimorph mirrors that can free ultrashort laser pulses from simultaneously present strong wave-front distortions and intensity-profile modulations. This is applied to the Max-Planck-Institut für Quantenoptik 10-TW Advanced Titanium-Sapphire Laser (ATLAS) facility. demonstrate with this focusability ATLAS be improved 10(18) 2x10(19) W/cm(2) without any penalty in recompression fidelity.

An improvement of laser-focused peak intensity has been achieved in a JAERI 100 TW Ti:sapphire chirped-pulse amplifier chain with feedback controlled adaptive optics system operating at 10 Hz repetition rate. The Strehl ratio was enhanced to 0.8 by means Bimorph deformable mirror Shack-Hartmann wave-front sensor. Measurements optical parameters the laser pulse and an experimental tunneling ionization yield helium have practically confirmed focusing ultrarelativistic intensities over...

We discuss the use of liquid-crystal phase modulators (LCPM's) both as a repeatable disturbance test source and an adaptive optics corrector. LCPM's have potential to induce controlled, repeatable, dynamic aberrations into optical systems at low cost, complexity, high flexibility. Because they are programmable can be operated transmissive elements, easily inserted path system used generate source. When wave-front correctors act piston-only segmented mirror number advantages. These include...

In both scientific and industrial laser beam applications is essential for users to know what could be expected from the beam. That why analysis of parameters very important during use in various applications. To describe one can a quality factor <i>M²</i> that characterizes degree imperfection There are many methods determination. The most common way device based on techniques described International Standard ISO11146 "Test parameters: Beam widths, divergence angle propagation...

Bimorph mirrors for laser beam correction and formation were developed investigated. Different types of substrates active piezoceramics materials considered to fabricate temperature independent shape the mirror surface maximize sensitivity mirror. High reflectivity coatings different wavelengths studied.