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Q: Fachverband Quantenoptik und Photonik
Q 21: Laserentwicklung: Festkörperlaser 2
Q 21.2: Vortrag
Dienstag, 15. März 2011, 10:45–11:00, SCH A215
888 nm diode-pumped nanosecond Nd:YVO4-highpower-laser at 1342 nm — •Florian Lenhardt1, Achim Nebel2, Ralf Knappe2, Thorsten Bauer3, Jürgen Bartschke3, and Johannes L’huillier1 — 1Photonik-Zentrum Kaiserslautern e.V., Kohlenhofstrasse 10, 67663 Kaiserslautern — 2Lumera Laser GmbH, Opelstrasse 10, 67661Kaiserslautern — 3Xiton Photonics GmbH, Kohlenhofstrasse 10, 67663 Kaiserslautern
Compact and efficient diode pumped all-solid-state lasers operating in the infrared spectral region around 1.3 µm have important applications in fiber optics, medical treatment and scientific research. Moreover this wavelength is attractive for the display technology via harmonic generation into red (SHG) or blue radiation (THG). Among the different laser materials in particular the 4F3/2 → 4I13/2-transition of Nd doped laser materials is of great interest for this wavelength range. However the main limitation of 1342 nm Nd-lasers is the strong thermal load, due to the large quantum defect and excited state absorption (ESA). This finally results into a strong thermal lens. In this contribution we report on the design, development and optimization of a Nd:YVO4 laser at 1342 nm pumped at 888 nm and actively Q-switched by an accusto optical modulator. The development leads to an average output power of 14 W with a pulse duration of 18 ns at a pulse repetition rate of 10 kHz, giving a peak power of 61 kW and pulse energy of 1.4 mJ. The pulses are very stable with pulse energy fluctuations less 0.5 % and the beam quality of the laser radiation is diffraction limited.