The laser diodes (LD) have numerous applications and promise to become key elements for next generation laser
technologies. LD are usually operated under conditions of heavy thermal load. As a result, the devices are affected by
aging processes leading to changes of the operation parameters, degradation and, eventually, complete failure.
Degradation of high power semiconductor lasers remains a serious problem for practical application of these devices. We
investigated the effect of mounting induced strain and defects on the performance of high power laser. In this paper
measurements of the temperature distribution and the electroluminescence along the cavity of InGaAs quantum well
lasers before and after accelerated aging processes are presented. The electro-optical parameters of the high output power
laser diodes, such as emission wavelength, output power, threshold current, slope efficiency, and operating lifetime are
presented too.
Ceramic materials are interesting alternative to single crystals for various optoelectronic applications including high-power
lasers and phosphors. Main advantages of ceramics compared to their single crystal counterparts are lower costs
of production, ability to incorporate higher dopant concentrations and possibility to manufacture larger elements. In the
present work, the spectroscopic properties of ceramics obtained by two different methods are compared. First method
relies on solid-state reaction of nanometric oxide powders, i.e. Al2O3, Y2O3 and Nd2O3. The oxides with addition of
tetraethyl orthosilicate were sintered under vacuum and anealled. Second method is the synthesis of neodymium-doped
aluminium garnet (Nd:YAG) nanocrystalline powders prepared by coprecipitation technique. The powders were calcined
and vacuum-sintered in optimized process conditions. For all ceramic samples fluoresce and decay data is presented.
Presented results indicate that the ceramic samples obtained by reactive sintering method have superior spectroscopic
properties compared to the samples synthesized from Nd:YAG nanocrystalline powders. The optimization of
manufacturing process allowed to demonstrate ceramics having the properties comparable to single crystal counterparts.
Optical quality and luminescent properties make the ceramics manufactured at the Institute of Electronic Materials
Technology an interesting candidate for laser applications.
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