Abstract
Mode-locked (ML) lasers emitting in the spectral range of ~2 μm are based on Thulium (Tm3+) or Holmium (Ho3+) ions. The former one typically emits slightly below 2 μm where the atmosphere water vapour absorption can constrain the emission bandwidth of a ML laser. A disordered host material can provide inhomogeneous broadening of the emission spectra beyond 2 μm: recently, a Tm3+-doped disordered CNGG-type garnet generated 78 fs pulses at 2017 nm [1]. Another route is the use of Tm3+,Ho3+ codoped materials for further spectral broadening.
© 2019 IEEE
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