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Thick Holographic Optical Elements

#0578


Thick Holographic Optical Elements

Tech Area / Field

  • PHY-OPL/Optics and Lasers/Physics

Status
3 Approved without Funding

Registration date
15.02.1996

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov

Supporting institutes

  • LUMEX, Russia, St Petersburg

Collaborators

  • HOLOS, USA, NH, Nashua

Project summary

Any user of laser radiation necessarily meets the problem of beam correction and beam cleanup. At the present time this problem is usually solved by means of spatial filters (pinholes) which are placed on the beam way. Such filters exhibit, however, some important drawbacks, namely, they are rather expensive, require a long time for their alignment, can't be used with powerful lasers.

The goal of this joint project is to develop a holographic spatial filter on the base of thick holograms to be used for filtration of spatial frequencies in laser beams. The preliminary research work already performed shows a principal possibility to solve this problem using new recording media: photopolymer "Reoksan".

As compared with traditionally used devices (pinholes), these new elements:


- are cheaper in manufacturing
- are aligned considerably easier
- may be used with high power lasers
- may be built into laser cavity, that will lead to the development of a new class of scientific devices

The development of such holographic elements requires serious theoretical and experimental research work in the field of technology of three-dimensional recording media as well as in the technology of three-dimensional holograms recording.

Authors reason that these technologies will become a starting point for developing and manufacturing of a group of devices, based on thick holograms.

Unique possibilities of deriving of high quality laser beams and their applications in a wide range of scientific, technological and medical problems are connected to phase conjugation at Stimulated Brillouin Scattering (SBS). Their development would open new perspectives in nonlinear optics, devices of distant optical communication, X-ray lithography, inertial thermonuclear fusion, lot of other applications.

Nevertheless, the lasers with phase conjugation have not until now left in serial production, that is connected to extremely rigid restrictions on parameters of a SBS pump radiation. Usually Stokes radiation except a conjugate component contain a significant portion of a radiation uncorrelated with the pump one, that reduces in parameters of lasers with SBS mirrors.

The goal of the given project in a part of problems, soluble in VNIIEF, is a investigation of a possibility of a raise of phase conjugation quality at SBS by a method of a spatial filtration of a conjugate component, including with the help of thick holograms.

Realization of the project will allow to expand a range of application as thick holograms as phase conjugation devices and will allow to create lasers of a new generation with diffractional quality of a radiation.

The authors assume, that these developments will become a basis of creation and production of the whole group of devices, based on use of the thick holograms and phase conjugation devices.


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