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Passively mode-locked Tm,Ho:YAG laser at 2 µm based on saturable absorption of intersubband transitions in quantum wells

: Yang, K.J.; Bromberger, H.; Ruf, H.; Schäfer, H.; Neuhaus, J.; Dekorsy, T.; Grimm, C.V.B.; Helm, M.; Biermann, K.; Künzel, H.

Postprint (170 KByte; PDF; )

Optics Express 18 (2010), No.7, pp.6537-6544
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer HHI ()

We report the first demonstration of a solid state laser passively mode-locked through the saturable absorption of short-wavelength intersubband transitions in doped quantum wells: a continuous wave Ti:sapphire laser end-pumped Tm,Ho:YAG laser at the center wavelength of 2.091 mu m utilizing intersubband transitions in narrow In0.53Ga0.47As/Al0.53As0.47Sb quantum wells. Stable passive mode-locking operation with maximum average output power of up to 160 mW for 2.9 W of the absorbed pump power could last for hours without external interruption and a mode-locked pulse with duration of 60 ps at repetition rate of 106.5 MHz was generated.