National Repository of Grey Literature 2 records found  Search took 0.02 seconds. 
Návrh apodizovaných-chirpovaných vláknových mřížek založený na metodách vrstveného dielektrika a přenosových matic
Helán, R. ; Urban, F. ; Mikel, Břetislav
This paper discusses methods for calculation properties of apodized-chirped fiber Bragg gratings (FBGs). These are one of the most enveloping optical devices in telecommunications and sensor systems. Work is aimed to design of FBGs with utilization especially in sensor systems and laser interferometry for semiconductor laser stabilization at wavelength about 760nm. FBG is described by periodic spatial function of effective mode index, including apodization and chirp profiles. Sampling makes function discrete and each sample represents one layer of dielectric media. The transfer matrix is made for each step. The overall transfer matrix is created by multiplying of these step-matrices. The spectral characteristic and group delay are calculated from overall transfer matrix at the end. This method provides design of arbitrary gratings, which are widely used in many optical systems, such as band filters, in-fiber sensors or fiber grating lasers and amplifiers for their unique properties.
Pozorování vícevrstvých polovodičových struktur v rastrovacím elektronovém mikroskopu
Wandrol, Petr ; Matějková, Jiřina ; Autrata, Rudolf
This work deals with problems related to the observation of semiconductor specimens in the scanning electron microscope. It was found that the best method for the localization of defects in the semiconductor structure cross sections is the imaging of their material contrast by the scintillation detector of backscattered electrons. This detector also can effectively suppress the influence of specimen charging on the image.

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