Multi-octave visible to long-wave IR femtosecond continuum generated in Cr:ZnS-GaSe tandem

Academic Article


  • We report a technique for generation of broad and coherent femtosecond (fs) continua that span several octaves from visible to long-wave IR parts of the spectrum (0.4–18 µm). The approach is based on simultaneous amplification of few-cycle pulses at 2.5 µm central wavelength at 80 MHz repetition rate, and augmentation of their spectrum via three-wave mixing in a tandem arrangement of polycrystalline Cr:ZnS and single crystal GaSe. The obtained average power levels include several mW in the 0.4–0.8 µm visible, 0.23 W in the 0.8–2 µm near-IR, up to 4 W in the 2–3 µm IR, and about 17 mW in the 3–18 µm long-wave IR bands, respectively. High brightness and mutual coherence of all parts of the continuum was confirmed by direct detections of the carrier envelope offset frequency of the master oscillator.
  • Authors

    Published In

  • Optics Express  Journal
  • Digital Object Identifier (doi)

    Author List

  • Vasilyev S; Moskalev I; Smolski V; Peppers J; Mirov M; Muraviev A; Vodopyanov K; Mirov S; Gapontsev V
  • Start Page

  • 16405
  • End Page

  • 16413
  • Volume

  • 27
  • Issue

  • 11