S.D. Velikanov - Dr.Sc. (Phys.-Math.), Professor, Head of Integrated Research Department, Federal State Unitary Enterprise RFNC-VNIIEF, ILFI, Integrated Scientific Research Department 1321. E-mail: velikanov@otd13.vniief.ru N.А. Zaretsky - Head of Research Department, Federal State Unitary Enterprise RFNC-VNIIEF, ILFI, Scientific Research Department 1321. E-mail: zaretsky@otd13.vniief.ru R.V. Porubov - Junior Research Scientist, Federal State Unitary Enterprise RFNC-VNIIEF, ILFI, Scientific Research Department 1321. E-mail: rom-porubov@yandex.ru V.V. Shurov - Ph.D. (Phys.-Math.), Leading Research Scientist, Federal State Unitary Enterprise RFNC-VNIIEF, ILFI, Scientific Research Department 1321. E-mail: shurov@otd13.vniief.ru

The possibility of application of an unstable telescopic optical resonator in a compact electric-discharge DF-laser has been experimentally and computationally demonstrated. Analysis of different configurations of the unstable telescopic optical resonator has been carried out, advantages and disadvantages of these configurations have been estimated. Experimental and calculation-theoretical research of laser emission parameters has been carried out with the unstable optical resonator and with the Fabry-Perot optical resonator. It has been shown that with the application of the unstable telescopic optical resonator it is possible to achieve the laser radiation di-vergence close to its diffraction limit and it is possible to control the laser radiation divergence effectively in quite wide range without using additional optical elements in the system. Estimation of the effect misalignments of the unstable optical resonator mirrors on the energy and spatial characteristics of laser emission has been carried out. It has been demonstrated that the application of the unstable optical resonator allows to improve the stability of spatial and energy characteristics of laser emission under angular misalignments of the optical resonator mirrors. Divergence angle of laser emission and deflection angle of the axis of directivity diagram of laser emission depend on angular misalignments of the mirrors to a far lesser degree compared with the Fabry-Perot optical resonator. The general recommendations have been given with respect to the choice of optimal configurations of the resonator in terms of achieving required output characteristics of laser. Experimental dependences of energy and spatial characteristics of laser emission on magnification factor М of the resonator have been given.

 

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