title: Efficient generation of 1.9  W yellow light by cascaded frequency doubling of a distributed Bragg reflector tapered diode.
abstract: Watt-level yellow emitting lasers are interesting for medical applications, due to their high hemoglobin absorption, and for efficient detection of certain fluorophores. In this paper, we demonstrate a compact and robust diode-based laser system in the yellow spectral range. The system generates 1.9 W of single-frequency light at 562.4 nm by cascaded single-pass frequency doubling of the 1124.8 nm emission from a distributed Bragg reflector (DBR) tapered laser diode. The absence of a free-space cavity makes the system stable over a base-plate temperature range of 30 K. At the same time, the use of a laser diode enables the modulation of the pump wavelength by controlling the drive current. This is utilized to achieve a power modulation depth above 90% for the second harmonic light, with a rise time below 40  μs.
authors.forename: A K
authors.initials: AK
authors.lastname: Hansen
authors.forename: M
authors.initials: M
authors.lastname: Christensen
authors.forename: D
authors.initials: D
authors.lastname: Noordegraaf
authors.forename: P
authors.initials: P
authors.lastname: Heist
authors.forename: E
authors.initials: E
authors.lastname: Papastathopoulos
authors.forename: V
authors.initials: V
authors.lastname: Loyo-Maldonado
authors.forename: O B
authors.initials: OB
authors.lastname: Jensen
authors.forename: P M W
authors.initials: PM
authors.lastname: Skovgaard