Open AccessEnhanced efficiency of AlGaInP disk laser by in-well pumping
Author(s) -
Cherry May N. Mateo,
U. Brauch,
Thomas Schwarzbäck,
Hermann Kahle,
Michael Jetter,
Marwan Abdou Ahmed,
Peter Michler,
Th. Graf
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.002472
Subject(s) - laser , materials science , optoelectronics , optics , laser pumping , optical pumping , absorption (acoustics) , slope efficiency , continuous wave , quantum well , wavelength , photoluminescence , photon , laser power scaling , fiber laser , physics , composite material
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.