Semiconductor Physics, Quantum Electronics & Optoelectronics, 28 (1), P. 083-092 (2024).
DOI: https://doi.org/10.15407/spqeo28.01.083

Efficient passive laser Q-switches based on dye-doped polyurethane for high-energy neodymium lasers

T.V. Bezrodna1, A.Ì. Negriyko1, V.I. Bezrodnyi1, I.V. Matsnev1, L.F. Kosyanchuk2, O.I. Antonenko2

1Institute of Physics, NAS of Ukraine, 46 Nauky Avenue, 03028 Kyiv, Ukraine
2Institute of Macromolecular Chemistry, NAS of Ukraine, 48 Kharkivske Avenue, 02160 Kyiv, Ukraine
*Corresponding author e-mail: tomaalone@yahoo.com





Abstract. This paper studies energy and time operation characteristics of a laser on a Nd3+:YAG crystal with passive Q-switches based on a dye-activated aliphatic polyurethane matrix with high radiation strength. A high efficiency of laser generation both in a free mode and at single pulse generation in the Q-switched regime is obtained using a samarium diffuse reflector with a BaSO4 filler. A single pulse energy and duration for the lasers with passive Q-switches based on organo-nickel complex BDN and polymethine dye IR-1061 in an aliphatic polyurethane matrix polymerized by the polycondensation method from 1.6-diisocyanatohexane, poly[di(ethylene glycol) adipate] and trimethylolpropane as starting components were compared. A powerful single pulse with an energy of ~1 J was obtained in the Q-switching mode using polymethine thiopyrylo-4-tricarbocyanine dye (IR-1061). The highly efficient Q-switching caused by the use of passive laser Q-switch based on the IR-1061 dye is shown to be due to its specific linear and nonlinear spectral properties.

Keywords: solid-state laser, nonlinear absorption, saturable absorber, passive Q-switching, polyurethane matrix, dyes.

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