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A room-temperature continuous-wave operating midinfrared light emitting device

: Weik, F.; Steinmeyer, G.; Tomm, J.W.; Glatthaar, R.; Vetter, U.; Nurnus, J.; Lambrecht, A.


Journal of applied physics 99 (2006), No.11, Art. 114506, 4 pp.
ISSN: 0021-8979
ISSN: 1089-7550
Journal Article
Fraunhofer IPM ()
light emitting device; infrared source; integrated optoelectronics; optical pumping

An optimized light source for the 45 µm wavelength region with a continuous-wave output power of 2 mW at ambient temperature is introduced. The device is based on a narrow-gap lead salt semiconductor chip, which is optically pumped by a standard high-power diode laser array. Surface patterning is employed and leads to an up to sixfold increase in out-coupling efficiency compared to untreated chip surfaces. A model is presented that explains this enhancement of the light extraction. Output efficiencies of 4×104 are achieved.