title: Frequency-doubled DBR-tapered diode laser for direct pumping of Ti:sapphire lasers generating sub-20 fs pulses.
abstract: For the first time a single-pass frequency doubled DBR-tapered diode laser suitable for pumping Ti:sapphire lasers generating ultrashort pulses is demonstrated. The maximum output powers achieved when pumping the Ti:sapphire laser are 110 mW (CW) and 82 mW (mode-locked) respectively at 1.2 W of pump power. This corresponds to a reduction in optical conversion efficiencies to 75% of the values achieved with a commercial diode pumped solid-state laser. However, the superior electro-optical efficiency of the diode laser improves the overall efficiency of the Ti:sapphire laser by a factor > 2. The optical spectrum emitted by the Ti:sapphire laser when pumped with our diode laser shows a spectral width of 112 nm (FWHM). Based on autocorrelation measurements, pulse widths of less than 20 fs can therefore be expected.
authors.affiliation: Department of Photonics Engineering, Technical University of Denmark, Frederiksborgvej 399, 4000 Roskilde, Denmark. amul@fotonik.dtu.dk
authors.forename: André
authors.initials: A
authors.lastname: Müller
authors.forename: Ole Bjarlin
authors.initials: OB
authors.lastname: Jensen
authors.forename: Angelika
authors.initials: A
authors.lastname: Unterhuber
authors.forename: Tuan
authors.initials: T
authors.lastname: Le
authors.forename: Andreas
authors.initials: A
authors.lastname: Stingl
authors.forename: Karl-Heinz
authors.initials: KH
authors.lastname: Hasler
authors.forename: Bernd
authors.initials: B
authors.lastname: Sumpf
authors.forename: Götz
authors.initials: G
authors.lastname: Erbert
authors.forename: Peter E
authors.initials: PE
authors.lastname: Andersen
authors.forename: Paul Michael
authors.initials: PM
authors.lastname: Petersen
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D004867:Equipment Design; D054023:Lasers, Semiconductor; D053844:Lasers, Solid-State; D008962:Models, Theoretical; D055095:Optics and Photonics / Q000295:instrumentation*; D014025:Titanium / Q000737:chemistry*
chemical_list: D014025:Titanium; D000537:Aluminum Oxide