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High power diode lasers in the 9xx nm wavelength range are required for application in material processing, such as metal cutting and welding, either directly or as pump sources for solid state or fiber lasers. For example, continuous wave (CW) 1-cm diode laser bars are used for economic pumping of disk lasers [1] and continually improved optical output powers P, power conversion efficiency ηΕ = P/IV...
High power diode lasers with novel extreme-double-asymmetric epitaxial designs with increased modal confinement in the well Γ achieve high efficiency (50%) and powers (14 W) at high continuous wave heatsink temperature (75°C), attributed to the effective suppression of power saturation mechanisms. Prospects for increased performance via further increased Γ are analyzed.
An overview is presented of progress in studies to diagnose and address limits to peak power in high power diode lasers. Key terms in advanced structures include carrier losses in the p-side waveguide, self-heating effects in the quantum well, and longitudinal spatial hole-burning.
While phosphate (Pi) serves as an essential and indispensible plant nutrient, phosphite (Phi) acts as a potent herbicide. Despite their differential influence on plants, both the ions can attenuate phosphate starvation responses (PSRs). We analyzed and compared Pi and Phi uptake and accumulation, attenuation of PSRs and the morphological and physiological responses of the rice seedlings in response...
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