title: High power and single mode quantum cascade lasers.
abstract: We present a single mode quantum cascade laser with nearly 1 W optical power. A buried distributed feedback reflector is used on the back section for wavelength selection. The laser is 6 mm long, 3.5 μm wide, mounted episide-up and the laser facets are left uncoated. Laser emission is centered at 4.68 μm. Single-mode operation with a side mode suppression ratio of more than 30 dB is obtained in whole range of operation. Farfield measurements prove a symmetric, single transverse-mode emission in TM00-mode with typical divergences of 41° and 33° in the vertical and horizontal direction respectively. This work shows the potential for simple fabrication of high power lasers compatible with standard DFB processing.
authors.forename: Alfredo
authors.initials: A
authors.lastname: Bismuto
authors.forename: Yves
authors.initials: Y
authors.lastname: Bidaux
authors.forename: Stéphane
authors.initials: S
authors.lastname: Blaser
authors.forename: Romain
authors.initials: R
authors.lastname: Terazzi
authors.forename: Tobias
authors.initials: T
authors.lastname: Gresch
authors.forename: Michel
authors.initials: M
authors.lastname: Rochat
authors.forename: Antoine
authors.initials: A
authors.lastname: Muller
authors.forename: Christopher
authors.initials: C
authors.lastname: Bonzon
authors.forename: Jerome
authors.initials: J
authors.lastname: Faist