Continuous pulsed-periodic laser radiation generator

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Abstract

The application of an amplifying module developed for a pulse-periodic amplifier as an active medium of a pulse-periodic continuous-wave laser radiation generator is considered. The created computer model of such a generator is described. The results of computational experiments are presented. It is shown that in this generator in the free-running mode it is possible to obtain more than 80% of the pump energy conversion into coherent radiation of the generator.

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About the authors

S. G. Garanin

The Russian Federal Nuclear Center – All-Russian Scientific Research Institute of Experimental Physics

Email: demyanov@triniti.ru

Academician of the RAS, Institute of Laser Physical Research

Russian Federation, Sarov, Nizhny Novgorod Region

A. V. Demyanov

State Research Center of the Russian Federation Troitsk Institute for Innovation and Fusion Research

Author for correspondence.
Email: demyanov@triniti.ru
Russian Federation, Troitsk, Moscow

V. N. Derkach

The Russian Federal Nuclear Center – All-Russian Scientific Research Institute of Experimental Physics

Email: demyanov@triniti.ru

Institute of Laser Physical Research

Russian Federation, Sarov, Nizhny Novgorod Region

K. N. Makarov

State Research Center of the Russian Federation Troitsk Institute for Innovation and Fusion Research

Email: demyanov@triniti.ru
Russian Federation, Troitsk, Moscow

V. A. Ostrovskiy

State Research Center of the Russian Federation Troitsk Institute for Innovation and Fusion Research

Email: demyanov@triniti.ru
Russian Federation, Troitsk, Moscow

M. I. Pergament

State Research Center of the Russian Federation Troitsk Institute for Innovation and Fusion Research

Email: demyanov@triniti.ru
Russian Federation, Troitsk, Moscow

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2. Fig. 1. Diode-pumped solid-state laser: Z1, Z2 – resonator mirrors; VK – vacuum chamber, KK – cryogenic chamber; DN1, DN2 – diode pump radiation; DZ1, DZ2 – dichroic mirrors; AE – active elements (Yb: YAG).

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3. Fig. 2. Wave front of a helium-cooled assembly. The scale on the right is in wavelengths (λ = 632 nm). The diameter of the pumped region is 80% of the AE diameter.

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4. Fig. 3. Dependence of the gain and output power on the pumping time. (a, b) – αth = 0.005 cm–1 (R = 95%); (c, d) – αth = 0.136 cm–1 (R = 25%); (a, c) – Lc = 100; (b, d) – Lc = 300 cm. The red dotted line is the generation threshold.

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5. Fig. 4. The fractions of the pump energy spent on the generated radiation, amplified spontaneous emission, and heating of the pumped region as a function of the pumping duration for Lc = 100 cm. (a) – αth = 0.005 cm–1 (R = 95%), (b) – αth = 0.035 cm–1 (R = 70%), (c) – αth = 0.068 cm–1 (R = 50%), (d) – αth = 0.136 cm–1 (R = 25%).

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