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Proceedings Paper

Optical and laser characterization of Nd:YAG ceramics elements
Author(s): Zdzisław Librant; Helena Węglarz; Anna Wajler; Henryk Tomaszewski; Tadeusz Łukasiewicz; Jan K. Jabczyński; Waldemar Zendzian; Jacek Kwiatkowski
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Paper Abstract

The Nd:YAG ceramics of nominal 1% and 2% Nd dopant were produced by a solid-state reaction of high-purity (4N) nanometric oxides powders i.e. Al2O3, Y2O3 and Nd2O3. Yttrium oxide nanopowder (XRD crystallite size of 79 nm) was produced by precipitation from water solution of high-purity hydrated nitrate, by means of ammonia hydro-carbonate. The cold isostatic pressing method was applied to densify granulated powder. Further the sintering and annealing processes were deployed to produce the final Nd:YAG ceramic samples. Mean grain sizes of about 20 µm and grain boundaries less than 10 nm of elaborated Nd:YAG ceramic samples were evaluated in SEM and TEM measurements. Thus, in microscale the quality of obtained ceramic was quite satisfactory. However, in macroscale, the samples had unacceptable level of voids and pores observed in visual inspection, which resulted in low 76% transmission, corresponding to extinction coefficient of 0.32 cm-1 at 1064-nm wavelength. The sizes of defects, pores and inclusions were of several dozens of micrometer. The active elements of rod and slab shape were fabricated and characterized in two diode pumping laser set ups. In end pumping configuration as a pump source 20-W fiber coupled laser diode was deployed. For the low duty cycle pumping (1 ms/20 Hz) above 30% slope efficiency was achieved. In the best case, 3.7 W of output power for 18 W of pump power, with M2 <1.4 were demonstrated for uncoated ceramics rod of φ4x3mm size. We have used uncoated elements, thus we can expect increase in laser parameters for optimized pumping conditions and samples with anti-reflective coatings. The parameters of elaborated ceramic material at this stage of work are unsatisfactory for laser application. However, the results of TEM measurements and laser characterizations seems to be quite promising..

Paper Details

Date Published: 20 November 2008
PDF: 6 pages
Proc. SPIE 7141, 16th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 714109 (20 November 2008); doi: 10.1117/12.822354
Show Author Affiliations
Zdzisław Librant, Institute of Electronic Materials Technology (Poland)
Helena Węglarz, Institute of Electronic Materials Technology (Poland)
Anna Wajler, Institute of Electronic Materials Technology (Poland)
Henryk Tomaszewski, Institute of Electronic Materials Technology (Poland)
Tadeusz Łukasiewicz, Institute of Electronic Materials Technology (Poland)
Jan K. Jabczyński, Military Univ. of Technology (Poland)
Waldemar Zendzian, Military Univ. of Technology (Poland)
Jacek Kwiatkowski, Military Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 7141:
16th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics
Agnieszka Popiolek-Masajada; Elzbieta Jankowska; Waclaw Urbanczyk, Editor(s)

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