4 April 2007 Resistance of KGSS 0180 neodymium glass to laser-induced damage under different irradiation conditions
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Abstract
Dependences of energy damage thresholds on radiation parameters and geometry for KGSS 0180 phosphate neodymium glass have been studied. Laser-induced damage threshold dependences on the pulse duration for the range of 1.5-20 ns for KGCC 0180 and K8 glasses are: εkgss = 16 τ1/2 εK8 = 18 τ1/2(J/cm2, when τ is in nanoseconds). Damage thresholds for the entrance and exit surfaces of KGSS 0180 glass samples have been measured when the samples were irradiated by a P-polarized beam at a Brewster's angle: εent ≈ 48 J/cm2; εex J/cm2. As has been found out, the threshold energy density of the beam in the case of Brewster's incidence to the exit surface of the sample is almost 1.5 times lower than in the case of a normal incidence. Testing techniques for detection of platinum micro-inclusions in the laser glass have been developed. The energy threshold for Pt-inclusions explosion has been determined at εtr ≈ 2.5 J/cm2 under laser pulse duration of 7 ns. Over 70 KGSS 0180 glass samples have been tested. It has been shown that platinum-induced damage was absent only in 25% of glass melts out of the entire tested amount. An averaged concentration of inclusions was Npt ~ 5 liter-1. Concentration of micro-inclusions in the last KGSS 0180 batch (2006 year) is ~ 1 liter-1.
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V. S. Sirazetdinov, V. I. Arbuzov, D. I. Dmitriev, K. V. Dukelsky, I. V. Ivanova, S. G. Lunter, V. N. Pasunkin, A. V. Savkin, A. V. Charukhchev, O. A. Sharov, "Resistance of KGSS 0180 neodymium glass to laser-induced damage under different irradiation conditions", Proc. SPIE 6610, Laser Optics 2006: Solid State Lasers and Nonlinear Frequency Conversion, 66100O (4 April 2007); doi: 10.1117/12.740014; https://doi.org/10.1117/12.740014
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