title: Cr:ZnS laser-pumped subharmonic GaAs optical parametric oscillator with the spectrum spanning 3.6-5.6  μm.
abstract: Using a subharmonic optical parametric oscillator (OPO) based on orientation-patterned GaAs, we produced a broadband instantaneous output that spans 3.6-5.6 μm at 50-dB level (4.4-5.2 μm at 3 dB level), has 110 mW of average power, and is suitable for producing wideband-frequency combs in the mid-infrared. The OPO was synchronously pumped by a compact Kerr-lens mode-locked femtosecond Cr:ZnS oscillator with the central wavelength 2.38 μm and pulse repetition frequency 175 MHz.
authors.forename: V O
authors.initials: VO
authors.lastname: Smolski
authors.forename: S
authors.initials: S
authors.lastname: Vasilyev
authors.forename: P G
authors.initials: PG
authors.lastname: Schunemann
authors.forename: S B
authors.initials: SB
authors.lastname: Mirov
authors.forename: K L
authors.initials: KL
authors.lastname: Vodopyanov