Authors:
S. A. Ivanov
;
N. V. Nikonorov
and
A. I. Ignatiev
Affiliation:
ITMO University and 49 Kronverksky ave., Russian Federation
Keyword(s):
Hologram, Refractive Index, Volume Bragg Gratings, VBG, Photo-Thermo-Refractive Glass, PTR Glass, Photo-Thermo-Inducted Crystallization, PTI Crystallization.
Related
Ontology
Subjects/Areas/Topics:
Mobile Software and Services
;
Optical Materials
;
Optics
;
Photonics, Optics and Laser Technology
;
Photorefractive Effects, Materials, and Devices
;
Telecommunications
;
Wireless Information Networks and Systems
Abstract:
Review on latest modification applied to chemical composition of PTR glass was made. Advancements of
updated chemical composition of PTR glass was shown in comparison with commercially produced glass.
Such properties as refractive index change, optimal exposition and optical losses in visible range for the
glass with recorded hologram was studied. In work samples of two chemical compositions were studied.
Conditions of matching included equal regimes of thermal treatment and expose dosages as well as
optimized parameters for each composition. Also the study of holograms received at optimal parameters for
each glass was made on three different wavelengths. Moreover several new applications for holograms on a
modified PTR glass were tested: such as holographic marks in telescopic systems and complex linked
holograms. Due to high transparency in visible range, PTR glass now can be applied for creating
holographic marks in telescopic systems. Studies show transparency of 92% with Fresnel
losses. Also it is
found that spectral selectivity is maintained for such holograms, thus it is opening a new way of optical
solutions in telescopic systems. As it was measured, spectral selectivity of recorded hologram corresponds
to 400mkm efficient thickness according to calculations. Though, it needs further studies to increase the
effective thickness of such holograms as well as investigations of different Bragg angles at recording step.
Complex (linked) holography is another way of multiplexing inside a bulk glass. It leads to combination of
reflecting and transmitting Bragg gratings as a unite element with proper functions. This, for instance, can
provide positive feedback for complexes of laser diode crystals on a small size site. Simultaneously, such
element can combine emission from all emitting surfaces in one beam. This study may lead to creation of
high power coherent diode laser sources at small size site with ultra-narrow emitting bandwidth and high
quality spatial beam characteristics.
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