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Investigations of photoresponse signals of LT-GaAs photodetector

Białous M., Świtkowski K., Kozanecka-Szmigiel A., Wierzbicki M., Pura B.

Optica Applicata

2009

Vol. 39, nr 1

161--167

In this paper, we demonstrate our electro-optic sampling system constructed for characterization of high-speed photodetectors based on low-temperature-grown GaAs (LT-GaAs). Changes in the shape of electrical signals for different optical powers, voltage biases and positions of a probe beam have been shown. The obtained photoresponse of the investigated photodetector exhibits 0.9 ps (full width at half maximum).

Ultrafast optical switching for polyarylates with allylic groups by Nd:YAG Sagnac interferometer

Ciolek R., Ratusznik G.J., Swillo R., Pura B., Zadrozna I., Piramidowicz R., Kaczorowska E., Zagorski A.

Optica Applicata

2006

Vol. 36, nr 2-3

381-387

In this paper, an ultrafast optical switching for thin polymer films (polyarylans with allylic groups) is presented. It was realized using the Nd:YAG Sagnac interferometer. Investigated polymers appeared to be suitable candidates for elements of integrated optical telecommunication systems.

Polarization bistability in a smectic-A liquid crystal.

Pura B., Wierzbicki M., Petykiewicz J., Ratusznik G.J., Wrzesiński Z.

Optica Applicata

2001

Vol. 31, nr 3

619-624

We report the measurements the of laser light polarization transmitted through the smectic-A phase of a liquid crystal placed inside the Fabry-Perot optical resonator. All four parameters of polarization were measured simultaneously by an ellipsometer of a special construction. Optical polarization bistability phenomenon was observed, in which polarization parameters of outgoing light depend nonlinearly on the intensity of the input beam. We propose a theoretical explanation of this phenomenon, based on the concept of orientational nonlinearity of liquid crystal's molecules

Determination of the thickness and optical constants of polyarylates with heterocyclic side chain group

Ratusznik G.J., Najechalski P., Ciolek R., Pura B., Zadrozna I., Mrozinski H.

Optica Applicata

2001

Vol. 31, nr 1

103-114

The investigation of the optical properties of the novel polyarylates with heterocyclic side chain groups is reported. Optical properties of the polymers obtained have been measured. Mechanical and thermal properties are also presented. The refractive index n( lambda ) and susceptibility chi /sup (1)/ have been determined for different compositions of polymers.