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15LS-PS-6
Radiation hardness of Nd:GdVO4 laser crystal
Y. Kalachev1, S. Kutovoi1, Y. Zavartsev1, A. Zagumennyi1, V. Mikhailov1,1. Shcherbakov1, M. Ashurov2, S. Ismailov2, K. Saidakhmedov2
1Prokhorov General Physics Institute of the Russian Academy of Sciences, Laser crystals, Moscow, Russian Federation
2Institute of Nuclear Physics of the Academy of Sciences of Uzbekistan, Nuclear Physics, Ulugbek, Uzbekistan
In our previous work the radiation hardness of Yb:LaSc3(BO3)4 and Yb:LuYSiO5 laser crystals was studied [1]. Now we studied radiation hardness of Nd:GdVO4 crystal by comparing transmissions spectra of laser crystal before and after irradiation using 60Co source. The radiation hardness of undoped GdVO4 crystal was studied as well. Direct laser experiments were performed. Induced absorption of undoped GdVO4 crystal was reduced with increasing of time delay after exposition. Crystal absorption at lasing wavelength 1,063 um was reduced from 0.016 cm-1 to 0.003 cm-1 in 90 minutes. The 0.5% Nd: Nd:GdVO4 crystal did not relax to initial absorbance after one week of aging. Its residual absorbance at lasing wavelength was 0.05 cm-1 .
Laser with y - irradiated Nd:GdVO4 crystal demonstrated slope efficiency of ~ 30% at lasing wavelength 1,063 um in spite of the presence of relatively weak crystal staining. Laser output power reach 800 mW at pumping power 4 W. (Fig.1).
■ H-W, -»-3-3CS < ♦
E'rcigm>- C0\ * »
.» ;'•--* • , . , , . , , :,o o.; 10 i,s zi j.: -o 4.5
AkGo-fced pjrrp "jtv/rr, VV
Fig. 1.
This means that this crystal can be considered as radiation-resistant at absorbed dose levels up to 10 Mrad, with subsequent cooling of more than 1 day.
This study was supported by the Federal Agency for Scientific Organizations (Contract 00242018-0016) and the Presidium of the Russian Academy of Sciences (Programs I.56 and I.7)
References
[1] Radiation Resistance of Yb:LaSc3(BO3)4 and Yb:LuYSiO5 Laser Crystals V. I. Vlasov, Yu. D. Zavartsev, M. V. Zavertyaev, A. I. Zagumennyi, Yu. L. Kalachev, V.A.Kozlov, S. A. Kutovoi, V. A. Mikhailov, and I. A. Shcherbakov. Physics of Wave Phenomena, 2018, Vol. 26, No. 4, pp. 1-5.
