Hannover 2010 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 6: Ultrashort Laser Pulses: Generation I
Q 6.4: Vortrag
Montag, 8. März 2010, 14:45–15:00, F 342
Passively mode-locked Yb:YCOB laser with sub-50-fs pulse duration — •Akira Yoshida1,2, Andreas Schmidt1, Valentin Petrov1, Uwe Griebner1, Christian Fiebig3, Katrin Paschke3, and Götz Ebert3 — 1Max-Born-Institut for Nonlinear Optics and Short Pulse Spectroscopy, Berlin — 2Institute of Laser Engineering, Osaka University, Japan — 3Ferdinand-Braun-Institut für Höchstfrequenztechnik, Berlin, Germany
Yb-doped YCa4O(BO3)3 or YCOB is an acentric crystal interesting for ultrashort pulse generation and self-frequency doubling lasers. Mode-locking of Yb:YCOB has been reported only in one short communication with the modest result of 210 fs pulse duration [1].
Femtosecond mode-locking is investigated for Yb:YCOB pumped by a two-section distributed Bragg-reflector tapered diode-laser at 976 nm. The shortest pulse duration of 69 fs with an average output power of 58 mW were obtained with a Y-cut Yb:YCOB sample for the E//Z polarization. The output spectral bandwidth was 26.7 nm (FWHM) centered at 1050 nm, corresponding to a time-bandwidth product of 0.49. After external compression pulse durations as short as 49 fs were achieved, yielding a time-bandwidth product of 0.36. The obtained pulse durations with Yb:YCOB are among the shortest pulses demonstrated with mode-locked Yb lasers. Shorter pulses with a duration of 47 fs have been reported only once before, with Yb:CaGdAlO4 [2].
[1] G. J. Valentine et al., Electron. Lett. 36, 1621 (2000).
[2] Y. Zaouter et al., Opt. Lett. 31, 119 (2006).