26 May 1999 Growth and investigation of BBO crystals with improved characteristics for UV harmonic generation
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Abstract
BBO crystals were grown by the top-seeded solution growth technique from a Na2-O melt-solution. Optimization of heating conditions and technological growth parameters allowed us to produce high-quality optic crystals. Their main morphological feature is the facing of a boule side surface. The area of hexagonal prism face {1120} can reach several square centimeters. Non-linear-optical elements which are produced from a crystal with well arranged faces have higher coefficients of laser radiation frequency conversion. The BBO crystals were studied for linear and non-linear absorption. Linear absorption was measured with conventional spectroscopic method. The analysis of supplementary absorption spectra and thermally- stimulated luminescence behavior allowed us to suggest that Na atoms are a main spontaneous impurity in BBO crystals providing supplementary absorption in UV-region. We used the 4th and 5th harmonics of Nd-YAG laser to measure the non-linear absorption. The selected optimized crystals were used in various optical schemes up to the 5th harmonic generation. Harmonic generation was studied by high performance original Nd-YAG laser (SLM-operation, D. L. output beam up to 100 Hz repetition rate, 1.8 ns pulse duration, 16 W output). Harmonic efficiency values are listed below. Several optical schemes for harmonic generation are discussed.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alexandr E. Kokh, Alexandr E. Kokh, Valentin Mishchenko, Valentin Mishchenko, Valery D. Antsygin, Valery D. Antsygin, Alexander M. Yurkin, Alexander M. Yurkin, Nadegda G. Kononova, Nadegda G. Kononova, Victor A. Guets, Victor A. Guets, Yury K. Nizienko, Yury K. Nizienko, Alexandr I. Zakharchenko, Alexandr I. Zakharchenko, } "Growth and investigation of BBO crystals with improved characteristics for UV harmonic generation", Proc. SPIE 3610, Laser Material Crystal Growth and Nonlinear Materials and Devices, (26 May 1999); doi: 10.1117/12.349228; https://doi.org/10.1117/12.349228
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