title: Enhanced efficiency of AlGaInP disk laser by in-well pumping.
abstract: The performance of a 665-nm GaInP disk laser operated continuous-wave at 15°C both in-well-pumped at 640 nm and barrier pumped at 532 nm is reported. The efficiency with respect to the absorbed power was enhanced by 3.5 times when using a 640-nm pump instead of a 532-nm pump. In-well pumping which is based on the absorption of the pump photons within the quantum-well heterostructures of the gain region instead of short-wavelength absorption in the barrier and spacer regions reduces the quantum defect between pump and laser photon and hence the heat generation. A slope efficiency of 60% with respect to the absorbed pump power was obtained by in-well pumping at 15°C. Continuous-wave laser operation was further demonstrated at heat sink temperatures of up to 55°C. Both the measurement of photoluminescence and COMSOL simulation show that the overall heat load in the in-well pumped laser is smaller than in the barrier-pumped laser. These results demonstrate the potential of optical in-well pumping for the operation of red AlGaInP disk lasers if combined with means for efficient pump-light absorption.
authors.forename: C M N
authors.initials: CM
authors.lastname: Mateo
authors.forename: U
authors.initials: U
authors.lastname: Brauch
authors.forename: T
authors.initials: T
authors.lastname: Schwarzbäck
authors.forename: H
authors.initials: H
authors.lastname: Kahle
authors.forename: M
authors.initials: M
authors.lastname: Jetter
authors.forename: M
authors.initials: M
authors.lastname: Abdou Ahmed
authors.forename: P
authors.initials: P
authors.lastname: Michler
authors.forename: T
authors.initials: T
authors.lastname: Graf