caa a22 4500 445369787 CHVBK 20180317142942.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s00340-011-4406-6 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4406-6 Characterization of channel waveguides in Pr:YLiF4 crystals fabricated by direct femtosecond laser writing [Elektronische Daten] [D. Beckmann, D. Esser, J. Gottmann] Single tracks and pairs of tracks are written in the volume of Pr-doped LiYF4-crystals using tightly focused femtosecond laser radiation (λ=1045nm, τ p=400-500fs, f=0.1-1MHz). Waveguiding between the tracks is demonstrated and optimized by varying the distance between the tracks and the laser writing conditions. The stress-induced guiding mechanism is explained based on TEM, interference microscopy, near-field and far-field measurements. It is shown that the single-crystalline material is getting poly-crystalline under femtosecond laser irradiation. By measuring the lifetime of the 3P1→3H5 transition and the emission spectrum at excitation with λ=444nm, no influence on these properties of the guided light is observed. This possibly enables the realization of a channel waveguide laser in the visible spectral range. Springer-Verlag, 2011 Beckmann D. Lehrstuhl für Lasertechnik LLT, RWTH Aachen University, Steinbachstr. 15, 52074, Aachen, Germany aut Esser D. Lehrstuhl für Lasertechnik LLT, RWTH Aachen University, Steinbachstr. 15, 52074, Aachen, Germany aut Gottmann J. Lehrstuhl für Lasertechnik LLT, RWTH Aachen University, Steinbachstr. 15, 52074, Aachen, Germany aut Applied Physics B Springer-Verlag 104/3(2011-09-01), 619-624 0946-2171 104:3<619 2011 104 340 https://doi.org/10.1007/s00340-011-4406-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4406-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Beckmann D. Lehrstuhl für Lasertechnik LLT, RWTH Aachen University, Steinbachstr. 15, 52074, Aachen, Germany aut NATIONALLICENCE 700 1- Esser D. Lehrstuhl für Lasertechnik LLT, RWTH Aachen University, Steinbachstr. 15, 52074, Aachen, Germany aut NATIONALLICENCE 700 1- Gottmann J. Lehrstuhl für Lasertechnik LLT, RWTH Aachen University, Steinbachstr. 15, 52074, Aachen, Germany aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 104/3(2011-09-01), 619-624 0946-2171 104:3<619 2011 104 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer