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Your search keyword '"Szewczyk, Olga"' showing total 17 results
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17 results on '"Szewczyk, Olga"'

1. Narrow–linewidth tunable laser source for long-wavelength optical coherence tomography at 1700 nm

Author

Szewczyk, Olga, Łaszczych Zbigniew, and Soboń Grzegorz

Subjects
Physics, QC1-999
Abstract

We present a widely tunable laser source with narrowed linewidths at the level of 0.4 – 1.1 nm. The laser source incorporates a comb-profile fiber (CPF) which allows for spectral compression of the tunable optical pulses to the linewidths below 1 nm. The spectral compression factor is as high as 37.2 and is the highest obtained for this wavelength range. With the use of an electro-optic modulator (EOM), the laser system ensures rapid tuning up to 10 GHz. Together with the wide spectral range of 1600-1900 nm, and compressed spectral width, the source meets the requirements of the optical coherence tomography (OCT).

Published
2024
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2. Dual-wavelength pumped highly birefringent microstructured silica fiber for widely tunable soliton self-frequency shift

Author

Szewczyk, Olga, Pala, Piotr, Tarnowski, Karol, Olszewski, Jacek, Vieira, Francisco Senna, Lu, Chuang, Foltynowicz, Aleksandra, Mergo, Pawel, Sotor, Jaroslaw, Sobon, Grzegorz, and Martynkien, Tadeusz

Subjects
Physics - Optics
Abstract

We report the design of a microstructured silica-based fiber for widely tunable soliton self-frequency shift, suitable for pumping with two most common fiber laser wavelengths: 1.04 {\mu}m and 1.55 {\mu}m. Depending on the pump source, the output spectrum can be continuously tuned up to 1.67 {\mu}m (pump at 1.04 {\mu}m) or 1.95 {\mu}m (pump at 1.55 {\mu}m) in the same 1.5 m-long fiber sample, with pump-to-soliton conversion efficiency higher than 20%. The fiber is highly birefringent, which results in an excellent polarization extinction ratio of the soliton, reaching 26 dB. The shifted solitons have a high degree of coherence confirmed by pulse-to-pulse interference measurement. The available soliton tuning range covers the wavelengths inaccessible for fiber lasers, e.g., 1.3 {\mu}m and 1.7 {\mu}m, highly important for multi-photon microscopy and imaging. Our work shows that it is possible to design and fabricate one universal optical fiber that supports soliton shift when pumped at two different wavelengths separated by over 500 nm.

Published
2020
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3. Molecular design, synthesis and anticancer activity of new thiopyrano[2,3-d]thiazoles based on 5-hydroxy-1,4-naphthoquinone (juglone)

Author

Ivasechko, Iryna, Lozynskyi, Andrii, Senkiv, Julia, Roszczenko, Piotr, Kozak, Yuliia, Finiuk, Nataliya, Klyuchivska, Olga, Kashchak, Nataliya, Manko, Nazar, Maslyak, Zvenyslava, Lesyk, Danylo, Karkhut, Andriy, Polovkovych, Svyatoslav, Czarnomysy, Robert, Szewczyk, Olga, Kozytskiy, Andriy, Karpenko, Olexandr, Khyluk, Dmytro, Gzella, Andrzej, Bielawski, Krzysztof, Bielawska, Anna, Dzubak, Petr, Gurska, Sona, Hajduch, Marian, Stoika, Rostyslav, and Lesyk, Roman

Published
2023
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6. Comparative study on fluoride fibers for mid-infrared generation pumped by a Cr:ZnS oscillator.

Author

Szewczyk, Olga and Kowalczyk, Maciej

Subjects
*COMPARATIVE studies, *FLUORIDES, *ZINC selenide, *RAMAN microscopy, *SOLITONS
Abstract

We demonstrate a comparative study on single-mode fluoride fibers for mid-IR generation. We took into consideration examples of ZBLAN fibers from all leading manufacturers. The fluoride fibers were pumped with the 30-fs pulses from a Cr:ZnS oscillator which allowed for Raman soliton generation up to 4 μm and supercontinuum generation up to 5.3 μm. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Dual-wavelength pumped highly birefringent microstructured silica fiber for widely tunable soliton self-frequency shift

Author

Szewczyk, Olga, Pala, Piotr, Tarnowski, Karol Lech, Olszewski, Jacek, Lu, Chuang, Foltynowicz, Aleksandra, Vieira, Francisco Senna, Mergo, Pawel, Sotor, Jaroslaw, Sobon, Grzegorz, Martynkien, Tadeusz, Szewczyk, Olga, Pala, Piotr, Tarnowski, Karol Lech, Olszewski, Jacek, Lu, Chuang, Foltynowicz, Aleksandra, Vieira, Francisco Senna, Mergo, Pawel, Sotor, Jaroslaw, Sobon, Grzegorz, and Martynkien, Tadeusz

Abstract

We report the design of a microstructured silica-based fiber for widely tunable soliton self-frequency shift, suitable for pumping with two most common fiber laser wavelengths: 1.04 μm and 1.55 μm. Depending on the pump source, the output spectrum can be continuously tuned up to 1.67 μm (pump at 1.04 μm) or 1.95 μm (pump at 1.55 μm) in the same 1.5 m-long fiber sample, with pump-to-soliton conversion efficiency higher than 20%. The fiber is highly birefringent, which results in an excellent polarization extinction ratio of the soliton, reaching 26 dB. The shifted solitons have a high degree of coherence confirmed by pulse-to-pulse interference measurement. The available soliton tuning range covers the wavelengths inaccessible for fiber lasers, e.g., 1.3 μm and 1.7 μm, highly important for multi-photon microscopy and imaging. Our work shows that it is possible to design and fabricate one universal optical fiber that supports soliton shift when pumped at two different wavelengths separated by over 500 nm.

Published
2021
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15. Dual-Wavelength Pumped Highly Birefringent Microstructured Silica Fiber for Widely Tunable Soliton Self-Frequency Shift

Author

Szewczyk, Olga, primary, Pala, Piotr, additional, Tarnowski, Karol, additional, Olszewski, Jacek, additional, Senna Vieira, Francisco, additional, Lu, Chuang, additional, Foltynowicz, Aleksandra, additional, Mergo, Pawel, additional, Sotor, Jaroslaw, additional, Sobon, Grzegorz, additional, and Martynkien, Tadeusz, additional

Published
2021
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16. Effects of gender identity manipulation of eating behaviours in males

Author

Szewczyk, Olga and Banas, Kasia

Subjects
food, masculinity, exercise intentions, gender identity
Abstract

The present study investigates the effects of gender identity manipulation in males though their choices of foods and healthy eating and exercise intentions. 203 participants were randomly assigned to one of the experimental conditions differing with respect to false feedback given about their masculinity: feminine (threat), masculine (affirmation), or no feedback (control). They were asked to complete an online questionnaire, including measurements of gender identity, a food selection task, intentions to exercise and healthy eating, and masculinity traits. A set of analyses revealed that participants in the threat (T) condition opted on average for more masculine foods at dinner than did people in affirmation (A) and control (C) conditions. The intensions to healthy eating were not influenced by the gender identity manipulation, while marginally significant differences were observed in exercise intention scores between participants in T and A. The current research suggests that males experiencing a threat to their masculinity change some of their behaviours in order to regain their sense of masculinity. This research can provide further evidence for effects of gender identity manipulation, and help in developing and implementing interventions aiming at changing attitudes about healthy lifestyle in males.

Published
2014

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