Erlangen 2018 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 6: Poster
K 6.4: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Orangerie
Femtosecond mode-locked Ti:Sapphire laser pumped by the 461 nm laser diode — •Denis A. Kopylov1, Tatiana V. Murzina1, Aleksandr V. Konyashchenko2, and Anton I. Maydykovskiy1 — 1Physics Department, Moscow State University, 119991 GSP-1, Leninskie Gory, Moscow, Russia — 2P.N. Lebedev Physics Institute, Russian Academy of Sciences, Leninskiy prosp 53, 119991 Moscow, Russia
One of the most widely used femtosecond solid-state lasers is based on a titanium-doped aluminum oxide crystal (Ti:Sapphire), possessing a wide fluorescence spectra ranging from 690 nm up to 1050 nm, which allows to create continuous wave and the Kerr-lens mode-locked lasers with the pulse duration from 5 fs up to 150 fs as well. The absorption spectrum of the Ti:Sapphire crystals corresponds to the spectral range 450-530 nm. Thus pumping of a Ti:Sapphire laser can be realized by using blue laser diodes. The laser diode beam profile is elliptical with a strong astigmatism. Therefore the beam correction schemes have to be developed for effective pumping of the Ti:Sapphire oscillator.
We demonstrate the mode-locked Ti:Sapphire oscillator pumped by a single diode laser (461 nm, 4 W) with the M2 equal to 2.6 and 11.8 for the fast and slow axes, respectively. We successfully demonstrate the CW and Kerr-lens mode-locked regimes of operation of laser diode pumped Ti:Sapphire with 3 mm, 5 mm and 10 mm length crystals. The pulses as short as 15 fs and a power of 170 mW are presented. The factors that have an effect on efficiency of Ti:Sapphire laser pumped by the laser diode are analyzed.