کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1790154 1524415 2015 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Comparison of AlGaInP-VECSEL gain structures
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Comparison of AlGaInP-VECSEL gain structures
چکیده انگلیسی

Author-Highlights
• We compare three different epitaxial designs for the active region.
• We could improve the optical output power by 20%.
• We could improve the absorption efficiency by 60%.
• We measured a maximum optical output power of 1.6 W.

We present a comparison of epitaxial designs for barrier pumped vertical external-cavity surface-emitting lasers in the red spectral range. The VECSEL chips are grown by metal-organic vapor-phase epitaxy as GaInP/AlGaInP multi-quantum well structures with 20 and 21 compressively strained quantum wells, respectively. The QWs are placed in various packages in a separate confinement heterostructure with quaternary AlGaInP-barrier and cladding layers. Beneath the active region there is a distributed Bragg reflector consisting of 55 λ/4λ/4 pairs of Al0.5Ga0.5As/AlAs. We compare three different QW distributions: one design includes 20 QWs arranged in 10 pairs, the second one contains 20 QWs arranged in 10 pairs with tensile strained barriers to compensate the compressive strain of the QWs, the third one has an exponential distribution of the QWs in tensile strained barriers. Laser parameters such as wavelength, differential efficiency, optical output power and absorption of the pump laser were measured for the different designs. By using the exponential distribution of QWs we could improve the differential efficiency by 42% and the output power by 20% compared to the not strain compensated 10×2 QW design. Furthermore we could improve the absorption efficiency by 60%60% at nearly the same laser wavelength.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 414, 15 March 2015, Pages 219–222
نویسندگان
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