The luminescence properties of Dy3+ and Tb3+ single- as well as Dy3+ / Tb3+ double-doped barium borate glasses are investigated for their potential as light-converter. In double-doped barium borate glass an energy transfer from Dy3+ to Tb3+ is observed, i.e., an intense green luminescence from the doped Tb3+ ions results upon excitation at Dy3+-related absorption bands. Ray-tracing simulations allow for an evaluation of singleand double-doped light guides in different length. Here, the luminous flux and luminance values at the rough output face of a luminescent light guide are determined.
A method to analyze the heat generation in luminescent barium borate glasses under continuous optical excitation is presented. The heat development is monitored by infrared thermography. Experimental surface temperature data are used as input for the differential heat equation to evaluate the volumetric heat rate from the spatial and temporal development of the temperature distribution. Having determined the volumetric heat rate in the glass, the heat generation under optical excitation can be estimated without further knowledge of optical parameters. Experiments on barium borate glasses with different doping levels are performed. For comparison, the heat generation is also estimated on the basis of optical parameters only to confirm the accuracy and validity of the presented method via infrared thermography. The experimentally determined total heat generation is in good agreement with those calculated from optical properties.
Si/Chalcogenide glass - hybrid slot waveguide designs are theoretically investigated to facilitate efficient
degenerate four wave mixing. The TE-field of the mode concentrates inside the infiltrated slot leading to a
nonlinear figure of merit >1. A periodic refractive index change is introduced to create a photonic band gap
with associated negative dispersion in the second band. This negative dispersion compensates for the usual
positive dispersion from waveguide and materials so that phase matching (group velocity dispersion = 0) can
be achieved. Changing the periodicity of the index variation the phase matching frequency can be tuned
across the whole near infrared allowing a flexible design of the hybrid photonic components.
A new and promising approach for the design and fabrication of novel optical devices is the functionalization
of individual pores in 2D photonic crystals (PhC). This can be done by infiltrating the pores with polymers or
dyes. We present a method to locally infiltrate individual pores. This new technique enables the fabrication
of a new class of devices, such as optical switches or multiplexers. For the infiltration of individual pores 2D
PhC templates made of macroporous silicon were used. Local addressing of the pores is carried out by using
focused ion beam technology. For the infiltration itself the wetting assisted templating process is applied. We
will present experimentally the infiltration of different polymers and different optical designs.
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