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Bücher Englische Bücher Wissen & Bildung Naturwissenschaft, Medizin, Informatik, Technik Physik & Astronomie Elektrizität, Magnetismus, Optik Epitaxial Design Optimizations for Increased Efficiency in GaAs-Based High Power Diode Lasers
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Epitaxial Design Optimizations for Increased Efficiency in GaAs-Based High Power Diode Lasers
Thorben Kaul (Unbekannter Einband, Englisch)
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Beschreibung
This work presents progress in the root-cause analysis of power saturation mechanisms in continuous wave (CW) driven GaAs-based high-power broad area diode lasers operated at 935 nm. Target is to increase efficiency at high optical CW powers by epitaxial design.
The novel extreme triple asymmetric (ETAS) design was developed and patented within this work to equip diode lasers that use an extremely… thin p-waveguide with a high modal gain. An iterative variation of diode lasers employing ETAS designs was used to experimentally clarify the impact of modal gain on the temperature dependence of internal differential quantum efficiency (IDQE) and optical loss. High modal gain leads to increased free carrier absorption from the active region. However, less power saturation is observed, which must then be attributed to an improved temperature sensitivity of the IDQE.
The effect of longitudinal spatial hole burning (LSHB) leads to above average non-linear carrier loss at the back facet of the device. At high CW currents the junction temperature rises. Therefore, not only the asymmetry of the carrier profile increases but also the average carrier density in order to compensate for the decreased material gain and increased threshold gain. This carrier non-pinning effect above threshold is found in this work to enhance the impact of LSHB already at low currents, leading to rapid degradation of IDQE with temperature.
This finding puts LSHB into a new context for CW-driven devices as it emphasizes the importance of low carrier densities at threshold. The carrier density was effectively reduced by applying the novel ETAS design. This enabled diode lasers to be realized that show minimized degradation of IDQE with temperature and therefore improved performance in CW operation. Dieses Produkt haben wir gerade leider nicht auf Lager.
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Technische Daten
Erscheinungsdatum
09.04.2021
Sprache
Englisch
EAN
9783736973961
Herausgeber
Cuvillier Verlag
Serien- oder Bandtitel
Innovationen mit Mikrowellen und Licht
Sonderedition
Nein
Autor
Thorben Kaul
Seitenanzahl
136
Auflage
1
Einbandart
Unbekannter Einband
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