We present the first experimental results obtained with a setup created on the basis of the PEARL laser facility for studying the processes of generating terahertz radiation from laser wake fields ...which are formed during the propagation of a high-power femtosecond laser pulse in a rarefied plasma. In particular, the occurrence of terahertz generation in the case where the laser–plasma interaction region is located between a pair of dielectric prisms of total internal reflection is demonstrated. The dependence of the terahertz radiation energy on the energy of a femtosecond laser pulse and on the plasma density is studied.
We have developed and tested experimentally a method for measuring optical wave fields, which is based on diffraction of the optical wave field at two complementary screens. An optical scheme of the ...experimental setup, which implements this method, has been developed, as well as the experimental procedure used to measure the phase of the optical wave field. The main parameters of the method, such as accuracy and spatial resolution, were studied experimentally. The developed optical scheme was calibrated, which allowed eliminating the systematic error of phase measurements introduced by the scheme elements.
A method of calibrating the spatial distribution of photosensitivity of matrix photodetectors without the use of reference optical radiation intensity distributions has been developed and ...experimentally verified. A scheme of the experimental setup implementing the method, an experimental procedure, and two modifications of the algorithm that reconstructs spatial distributions of photosensitivity using the measurement results have been developed. Experiments on calibrating the spatial distributions of photosensitivity of CCD matrices have been performed. It is shown that, using the presented method, calibration of the spatial distribution of photosensitivity of matrix photodetectors permits one to almost eliminate systematic error when detecting spatial distributions of the optical radiation intensity.
We propose a calibration method for spatial distribution of photosensitivity of matrix radiation receivers. It is based on measurements of time-stable distributions of the light beam intensity at ...several different combinations of mutual positions of the beam and the radiation receiver. The scheme of the experiment was developed to realize this method, and the inverse problem of reconstruction of the spatial distribution of photosensitivity from the measurement results was solved. Numerical simulation of the experiment was used to study the features of the calibration algorithm. The spatial distributions of light sensitivity of the matrices, which work on the principles of charge-coupled device operation, were calibrated in an experiment.
We propose a method for recording an optical wave field that is based on diffraction of the optical wave field by two screens that are complementary to each other. We show that the new method ensures ...the measurement of the phase of the wave field with a high accuracy and spatial resolution. An optical scheme for implementing the diffraction method and an algorithm for reconstructing the phase of the wave field from the measurement data are developed. We perform a computer simulation of the experiment on recording the optical wave field based on the method proposed.
We propose a new method for recording the wave field. The method is based on that the angular spectrum of the field is modulated using an amplitude mask. It is shown that the new method ensures high ...spatial and angular resolutions. An optical scheme for implementing the method and an algorithm for reconstructing the wave-field phase from the measurement data are developed. Computer simulation of the experiment for recording the wave field on the basis of the proposed method is performed.
Implementation of new Frontend for PW-Class PEARL Laser Facility Mukhin, I.B.; Glushkov, K.A.; Soloviev, A.A. ...
2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC),
2023-June-26
Conference Proceeding
PEARL laser facility was the first PW-class laser based on OPCPA, in which a peak power of 0.56 PW was achieved back in 2007 1. Since then, this facility has been actively used for studies in the ...field of laser physics and laser-matter interaction. Now, this facility is under upgrade. The Compression after Compressor Approach (CafCA) for additional nonlinear pulse compression 2, installation of a deformable mirror for a focal spot improvement 3 and pump laser optimization were implemented on PEARL facility. The main drawback of the PEARL laser setup is the instability of the electrical synchronization between the fs signal and pump pulses. But, both laser-matter interaction and implementation of CafCA and deformable mirror requires improving of pulse-to-pulse stability of PEARL laser.
A standing ultrasonic wave is visualized by the phase-contrast method using a Zernicke photothermal cell. The good-quality visualization is implemented without expanding and collimating a probing ...beam.
The novel diffraction method for optical wavefield recording is proposed. The experimental testing of the method was carried out. It was shown that the diffraction method provides wavefront ...measurements with high accuracy and spacial resolution.
This paper describes study of the possibility to use the technique to measure the spatial distribution of the intensity of moderate-power short millimeter waves, sensitivity of the technique in this ...frequency range, and its spatial resolution.
