title: Broadly tunable femtosecond near- and mid-IR source by direct pumping of an OPA with a 41.7 MHz Yb:KGW oscillator.
abstract: We generate over half a watt of tunable near-IR (1380-1830 nm) and several hundred milliwatts in the mid-IR (2.4-4.2 µm) as well as milliwatt level mid-IR (4.85-9.33 µm) femtosecond radiation by pumping an optical parametric amplifier directly with a 7.4 W Yb:KGW oscillator at 41.7 MHz repetition rate. We use 5 mm PPLN and 2 mm GaSe as downconversion crystals and seed this process by a supercontinuum from a tapered fiber. The system is extremely simple and very stable and could replace more complex OPOs as tunable light sources.
authors.affiliation: 4th Physics Institute and Research Center SCOPE, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany. j.krauth@pi4.uni-stuttgart.de
authors.forename: Joachim
authors.initials: J
authors.lastname: Krauth
authors.forename: Andy
authors.initials: A
authors.lastname: Steinmann
authors.forename: Robin
authors.initials: R
authors.lastname: Hegenbarth
authors.forename: Matteo
authors.initials: M
authors.lastname: Conforti
authors.forename: Harald
authors.initials: H
authors.lastname: Giessen
mesh_terms: D000669:Amplifiers, Electronic; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007259:Infrared Rays; D053844:Lasers, Solid-State; D009991:Oscillometry / Q000295:instrumentation*