Author
L. Fornasiero
Bio: L. Fornasiero is an academic researcher from University of Hamburg. The author has contributed to research in topics: Laser & Slope efficiency. The author has an hindex of 10, co-authored 15 publications receiving 716 citations.
Topics: Laser, Slope efficiency, Crystal, Fiber laser, Stimulated emission
Papers
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TL;DR: In this paper, rare earth doped scandia and yttria have been grown from rhenium crucibles by the Czochralski technique, to the best of our knowledge.
Abstract: Rare earth doped scandia and yttria have been grown from rhenium crucibles by the Czochralski technique - to our knowledge for the first time. Spectroscopic data of Yb:Sc 2 O 3 are presented in detail and first laser experiments are reported. Despite the rather high crystal losses of about 2 % a slope efficiency of 37 % was obtained under diode pumping.
148 citations
TL;DR: The sesquioxides Sc 2 O 3, Y 2 o 3, and Lu 2 o3 are suitable hosts for rare earth ions and are useful for high power solid-state lasers as mentioned in this paper.
143 citations
TL;DR: In this paper, the first diode-pumped laser experiments with ytterbium-doped lutetia have been conducted by the Bridgman method.
141 citations
TL;DR: In this article, the spectroscopic properties of yttrium oxide and scandium oxide with Ho3+- and Er3+− ion doped with rare earth ion were investigated.
85 citations
TL;DR: In this article, it was shown that ESA can be a small loss factor to the laser emission near 1060 nm but does considerably diminish the effective emission cross sections near 1340 nm.
Abstract: ion in the crystals YVO4, GdVO4, and Sr5(PO4)3F. The measurements were performed in the spectral region of the main laser transitions 4F3/2→4I9/2, 4F3/2→4I11/2, and 4F3/2→4I13/2by a continuous wave pump and probe technique. The calibrated gain and ESA spectra are presented and possible implications of ESA on the laser performance are estimated. It is shown that ESA can be a small loss factor to the laser emission near 1060 nm but does considerably diminish the effective emission cross sections near 1340 nm especially in Nd:YVO4 and Nd:GdVO4.
80 citations
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TL;DR: In this paper, the scaling laws for thin-disk laser design have been investigated for continuous-wave (CW) and Q-switched operation as well as for amplification of short (nanosecond, femtosecond) pulses.
Abstract: The principal ideas of the thin-disk laser design will be illustrated and the advantages for operating different laser materials will be explained. The results for continuous-wave (CW) and Q-switched operation as well as for amplification of short (nanosecond) and ultrashort (picosecond, femtosecond) pulses demonstrate the potential of the thin-disk laser design. The scaling laws for this laser design show that the power limit for CW operation is far beyond 40 kW for one single disk and the energy limit is higher than 3 J from one disk in pulsed operation. Also, the applicability of the thin-disk laser concept to optically pumped semiconductor structures will be discussed. When pumping directly into the quantum wells, the energy defect between the pump photon and the laser photon can be smaller than 5%, thus reducing the waste heat generated inside the semiconductor structure. First results demonstrate the potential of this new concept. Finally, a short overview of the industrial realization of the thin-disk laser technology will be given.
530 citations
TL;DR: Transparent polycrystalline ceramics have found various applications, such as laser hosts, infrared windows/domes, lamp envelopes and transparent armors, due mainly to their processing flexibility in fabricating items with large sizes and complex shapes and more importantly costeffectiveness as mentioned in this paper.
453 citations
TL;DR: In this article, the authors review recent advances in the development of novel lasing crystals and ceramics, as well as inorganic and organic nonlinear-laser crystals for χ(3) and cascaded frequency converters.
Abstract: After a brief examination of known insulating laser crystals and the stimulated emission channels of their generating activator ions, this article reviews recent advances in the development of novel lasing crystals and ceramics, as well as inorganic and organic nonlinear-laser crystals for χ(3) and cascaded χ(3) ↔ χ(2) frequency converters Several new modern attractive technologies in the physics and techniques of crystalline lasers are also discussed
358 citations
TL;DR: Godard et al. as discussed by the authors reviewed the main technologies, restricted to continuous-wave (CW) and nanosecond pulsed sources emitting in the 2-12 µm range, and discussed the pros and cons of these technologies in the context of several selected applications.
355 citations
TL;DR: In this article, a systematic study of charge transfer (CT) luminescence from Yb3+ is presented, where the authors investigated the influence of the size of the host lattice cation site on the charge transfer luminance.
323 citations