title: Passively mode-locked Tm,Ho:YAG laser at 2 microm based on saturable absorption of intersubband transitions in quantum wells.
abstract: 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 mum utilizing intersubband transitions in narrow In(0.53)Ga(0.47)As/Al(0.53)As(0.47)Sb 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.
authors.affiliation: Department of Physics and Center of Applied Photonics, University of Konstanz, 78457 Konstanz, Germany. k.j.yang@sdu.edu.cn
authors.forename: Kejian
authors.initials: K
authors.lastname: Yang
authors.forename: Hubertus
authors.initials: H
authors.lastname: Bromberger
authors.forename: Hartmut
authors.initials: H
authors.lastname: Ruf
authors.forename: Hanjo
authors.initials: H
authors.lastname: Schäfer
authors.forename: Joerg
authors.initials: J
authors.lastname: Neuhaus
authors.forename: Thomas
authors.initials: T
authors.lastname: Dekorsy
authors.forename: Christiana Villas-Boas
authors.initials: CV
authors.lastname: Grimm
authors.forename: Manfred
authors.initials: M
authors.lastname: Helm
authors.forename: Klaus
authors.initials: K
authors.lastname: Biermann
authors.forename: Harald
authors.initials: H
authors.lastname: Künzel