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Kvantovaya Elektronika, 2022 Volume 52, Number 5, Pages 449–453 (Mi qe18041)

Lasers

Specific features of radiation flux formation in diode-pumped lasers and amplifiers with active elements made of Nd : YAG ceramics

M. V. Bogdanovicha, V. N. Dudikova, K. V. Lepchenkova, V. A. Loikoa, Yu. M. Popovb, A. G. Ryabtseva, G. I. Ryabtseva, P. V. Shpaka, M. A. Shchemeleva

a B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk
b P. N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow

Abstract: The spatial, temporal, and spectral characteristics of the output radiation of diode-pumped laser systems and optical amplifiers with active elements made of Nd : YAG ceramics are studied. It is shown that the divergence of radiation in the subthreshold regime has the form of concentric nested cones emerging from the active element (AE) faces at angles of 2 – 4°. A model explaining the experimentally observed phenomenon is proposed based on the mechanism of scattering of the generated beam from the granular structure of the optical ceramics. Analysis of the divergence pattern makes it possible to estimate the grain size and the optical quality of ceramics. The output beam divergence in the lasing regime is determined mainly by the cavity parameters and does not exceed several milliradians. The scattering events in this case serve as sources of additional optical losses. Luminescence enhancement and parasitic oscillations in the AE volume restrict the possibility of using Nd : YAG ceramics for fabricating AEs of high-power optical amplifiers.

Keywords: Nd : YAG ceramic laser system, optical amplifier, optical ceramics, transverse diode pumping, amplified luminescence, parasitic oscillations.

Received: 12.12.2021
Revised: 10.03.2022
Accepted: 10.03.2022


 English version:
Quantum Electronics, 2022, 52:5, 449–453

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© Steklov Math. Inst. of RAS, 2024