Hannover 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 13: Ultrashort Laser Pulses: Generation II
Q 13.5: Vortrag
Montag, 8. März 2010, 17:30–17:45, F 342
Tm:KLu(WO4)2 laser mode-locked by a single-walled carbon nanotube saturable absorber — •Andreas Schmidt1, Günter Steinmeyer1, Valentin Petrov1, Uwe Griebner1, Won Bae Cho2, Sun Young Choi2, Jong Hyuk Yim2, Soonil Lee2, and Fabian Rotermund2 — 1Max Born Institute, Berlin, Germany — 2Ajou University, Suwon, South Korea
Mode-locked solid-state lasers in the 2-µm spectral range are of great interest for various applications. Numerous Tm3+-doped materials showed high efficiency and output powers in the CW and Q-switched regimes. So far only active mode-locking has been demonstrated with bulk Tm-lasers, and passive mode-locking using a SESAM has been shown solely in a Tm:Ho - codoped KY(WO4)2 laser operating around 2.05 µm [1].
Here, we demonstrate a passively mode-locked Tm:KLu(WO4)2 laser using a transmittive single-walled carbon nanotube saturable absorber (SWCNT-SA). The nonlinear dynamics of the SWCNT-SA were investigated by the pump-probe technique at 1.92 µm. The recovery time of the SWCNT-SA was estimated to be ≈ 1.2 ps. The laser yields picosecond pulses with maximum average output powers of 240 mW generated near 1.94 µm. The RF spectrum at the fundamental beat note of 126 MHz showed no spurious modulations and a noise floor that was approximately 60 dB below the signal. This high signal-to-noise ratio confirms stable single-pulse mode-locking without Q-switching instabilities.
[1] A. A. Lagatsky et. al., Opt. Lett. 34, (2009) 2587.