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Ultra-Bright Laser

#0591


Research of Nonlinear Optical Phenomena in Phase Conjugation Processes Aimed at Development of a New Generation of Ultra-Bright Lasers

Tech Area / Field

  • PHY-OPL/Optics and Lasers/Physics

Status
8 Project completed

Registration date
12.03.1996

Completion date
02.03.2001

Senior Project Manager
Malakhov Yu I

Leading Institute
TRINITI, Russia, Moscow reg., Troitsk

Supporting institutes

  • VNIIEF, Russia, N. Novgorod reg., Sarov

Collaborators

  • Lawrence Livermore National Laboratory, USA, CA, Livermore\nNCLR (Nederlands Centrum voor Laser Research), The Netherlands, Enschede

Project summary

The problem of the present project is study of nonlinear optical processes at broadband laser radiation phase conjugation to create basis for the next laser generation and to develop new class of nonlinear devices, allowing for significant decrease of the laser radiation pergence.

It is well known that the discovery of phase conjugation phenomenon was the precursor of the new laser generation with nearly diffraction limited radiation pergence. Creation of these lasers would provide unique feasibilities of their applications in scientific researches, long-distance communication, medicine, X-ray lithography, processing technology, inertial confinement fusion. The advantages of phase conjugation-application are well known. First, the requirements to fabrication quality of expensive optical components are reduced. Second, automatic alignment in laser subsystems embraced by phase conjugation could be realized. However, lasers created on the basis of phase conjugation at stimulated Brilloin scattering have not gone through scientific laboratories up today. There are two main reasons accounting for this fact, both being connected with.insufficient knowledge of physical mechanisms and phenomena acting in real optical devices. The first one is insufficient phase conjugation dynamic range realized in experiment, the second one is instability at broadband radiation phase conjugation. However, for majority of practical applications (optical images transmission, fiber optics communication, remote sensing of environmental pollutants etc.) the utilization of broadband radiation is a great of importance. It will allow for elimination of undesirable diffractional effects (speckle structures). On the other hand, it will preclude parasite nonlinear processes under laser radiation propagation that decrease to a great extent the reliability of laser systems. We suppose to carry out theoretical and experimental study both in the case of traditional phase conjugation at stimulated Brillouin scattering, and in the case of three-wave interaction in nonlinear crystals, where broadband conjugated-wave forming is possible with much less restrictions. Therefore, it is extremely actual to research broadband radiation phase conjugation. The further progress in this promising field of laser engineering is only possible in the way of careful comprehensive research of all ensemble of physical mechanisms and processes acting at phase conjugation.

Expected results

On the basis of experimental and computational-theoretical researches the models of phase conjugation will be developed. These models will allow us:


- to obtain algorithms for calculations of both the reflection coefficients and (he conjugated wave front fidelity for the case of initial multi-frequency radiation, taking into account the selffocusing in nonlinear medium;
- to clarify the influence of the ponderomotive forces, thermal processes, and random inhomogeneities of a refraction coefficient of a SBS-medium on phase conjugation process;
- to obtain the specific optical schemes of a phase conjugator at three-wave interaction and to develop the proposals on their use in powerful laser systems for inertial confinement fusion.

These models will allow us to develop specific phase conjugator schemes for compensation the wave front distortions of the broadband radiation.

In the course of the experimental works the following methods will be used:


- measurements of laser radiation wave front;
- integral measurements of the reflection coefficients and conjugation fidelity for the nonlinear mirrors;
- measurements of the temporal and spatial characteristics of the initial and conjugated waves.

In the course of the computational-theoretical works the following methods will be used:


- the method of parabolic equations for complex amplitudes of interaction waves, the Monte-Carlo parabolic equation method for the case of "double"-Gaussian pump beam, the method of quasioptic equation for the transverse correlation function.

The participation of foreign collaborator (LLNL) will include: the discussion of the project plans coordinated with the researches carried out in this institute; the development of the requirements to phase conjugation mirrors, based on consideration of the assembly of the possible laser-system architecture; the discussion of the researches results.


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