In recent years, laser-diode (LD) pumped solid-state lasers based on Yb3+-ions doped gain media have been investigated for high power, highly efficient ultrafast laser sources. Yb3+-doped Lu3Al5O12 (Yb:LuAG) is one of the favourable gain materials because of its high thermal conductivity even with high Yb3+-doping concentration [1]. However, narrow gain badwidth in Yb :LuAG is a large disadvantage for ultrashort pulse generation. Recently, SESAM (Semiconductor saturable absorber)-initiated passive mode-locking of Yb:LuAG ceramics [2-3] and single crysal [4] have been demonstrated. However, all of the demonstrations could not realize high output power with short pulse duration. A Kerr-lens mode-locking (KLM) technique was expected to improve the laser performances due to its deeper modulation depth and lower intra-cavity loss than those of SESAM.

© 2015 IEEE

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