Dr. Grzegorz Sobczak Profile

Dr. Grzegorz Sobczak

at Lukasiewicz - Institute of Microelectronics and Photonics

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Author

Publications (12)

Proceedings Article | 13 March 2024 Presentation

Optimization of technology of long wavelength (λ~13μm) quantum cascade lasers grown by MBE

Kamil Pierscinski, Piotr Gutowski, Dorota Pierscinska, Katarzyna Pieniak, Agata Krzastek, Dominika Niewczas, Grzegorz Sobczak, Iwona Sankowska, Aleksandr Kuzmicz, Jan Muszalski, Maciej Bugajski

Proceedings Volume PC12905, PC129050R (2024) https://doi.org/10.1117/12.3003343

KEYWORDS: Quantum cascade lasers, Waveguides, Quantum technologies, Surgery, Reliability, Long wavelength infrared, Heterojunctions, Fabrication, Electro optics, Doping

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Proceedings Article | 17 March 2023 Presentation

Thermal managment of integrated multi-emitter quantum cascade lasers platform

Dorota Pierścińska, Grzegorz Sobczak, Krzysztof Michalak, Joanna Branas, Aleksandr Kuźmicz, Kamil Pierscinski

Proceedings Volume PC12440, PC124400B (2023) https://doi.org/10.1117/12.2651551

KEYWORDS: Quantum cascade lasers, Mid-IR, Thermography, Thermal effects, Silicon, CCD cameras, Waveguides, Waveguide lasers, System integration, Spectroscopy

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Proceedings Article | 4 October 2022 Presentation

The experimental investigation of thermal properties of mid-IR quantum cascade lasers (Conference Presentation)

Dorota Pierscinska, Grzegorz Sobczak, Katarzyna Krajewska, Krzysztof Chmielewski, Aleksandr Kuzmicz, Piotr Gutowski

Proceedings Volume PC12202, PC1220208 (2022) https://doi.org/10.1117/12.2633775

KEYWORDS: Quantum cascade lasers, Gold, Mid-IR, Electro optics, Waveguides, Thermal modeling, Numerical modeling, Heterojunctions, Electro optical modeling, Cladding

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Proceedings Article | 4 October 2022 Presentation

Multi-section coupled cavity mid-IR quantum cascade lasers (Conference Presentation)

Kamil Pierscinski, Dorota Pierscinska, Aleksandr Kuzmicz, Grzegorz Sobczak, Piotr Gutowski, Krzysztof Chmielewski

Proceedings Volume PC12202, PC1220207 (2022) https://doi.org/10.1117/12.2633658

KEYWORDS: Quantum cascade lasers, Mid-IR, Wavelength tuning, Terahertz radiation, Laser stabilization, FT-IR spectroscopy, Yield improvement, Spectroscopy, Remote sensing, Reactive ion etching

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Proceedings Article | 13 March 2019 Presentation

Characterization and fabrication of monolithic two-section mid-IR quantum cascade lasers (Conference Presentation)

Kamil Pierscinski, Dorota Pierścińska, Aleksandr Kuźmicz, Krzysztof Chmielewski, Grzegorz Sobczak, Piotr Gutowski, Maciej Bugajski

Proceedings Volume 10939, 109391N (2019) https://doi.org/10.1117/12.2509537

KEYWORDS: Quantum cascade lasers, Mid-IR, Dry etching, Reactive ion etching, Heterojunctions, Ion beams, Etching, Mirrors, Scattering, Yield improvement

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Proceedings Article | 4 December 2018 Paper

Emitted beam stabilization in junction plane by lateral periodic structure in laser diodes emitting at 980 nm

Andrzej Maląg, Grzegorz Sobczak, Elżbieta Dąbrowska, Marian Teodorczyk

Proceedings Volume 10974, 1097404 (2018) https://doi.org/10.1117/12.2516448

KEYWORDS: Heterojunctions, Diodes, Waveguides, Modulation, Semiconductor lasers, Etching, Quantum wells, High power lasers, Continuous wave operation, Ion implantation

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Proceedings Article | 4 December 2018 Paper

Mid-infrared quantum cascade lasers

Maciej Bugajski, Dorota Pierścińska, Piotr Gutowski, Kamil Pierściński, Grzegorz Sobczak, Kamil Janus, Iwona Sankowska, Krzysztof Michalak, Krzysztof Chmielewski, Joanna Branas, Aleksander Kuźmicz

Proceedings Volume 10974, 1097409 (2018) https://doi.org/10.1117/12.2519567

KEYWORDS: Waveguides, Quantum cascade lasers, Gallium, Aluminum, Heterojunctions, Laser applications, Mid-IR, Laser development, Laser processing, Gallium arsenide

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Proceedings Article | 23 May 2018 Presentation

Experimental investigation of thermal designs of InP-based quantum cascade lasers (Conference Presentation)

Kamil Pierscinski, Dorota Pierścińska, Piotr Gutowski, Grzegorz Sobczak, Kamil Janus, Maciej Bugajski

Proceedings Volume 10682, 106820I (2018) https://doi.org/10.1117/12.2307637

KEYWORDS: Quantum cascade lasers, Temperature metrology, Charge-coupled devices, Indium gallium arsenide, Laser applications, Reliability, Mirrors, CCD cameras, Waveguides, Active optics

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An important issue in the technology of QCLs is the capability to extract heat out of the laser active area in order to reduce the increase of the temperature. High temperature not only reduces most performance metrics but also decreases device lifetime and impairs its reliability, leading to degradation of laser mirrors and destruction of the device. In this paper, we report on the investigation of the temperature of QCLs based on different designs. QCLs are complex, multilayer structures, which require high current and voltage to polarize the structure in order to obtain level alignment. This results in high heat generation. Thermal limitations in case of QCL are the most critical factor decreasing the performance of a device. High electrical power combined with relatively low wall-plug efficiency results in high-temperature increase in the active core. Efficient heat dissipation is difficult due to hundreds of layers impeding thermal conductivity of the structure. Moreover, the materials composing the gain region are ternaries with a composition of roughly 50%, what results in thermal conductivity lower by a factor of 10 than in case of bulk InP. Knowledge of the temperature is gained through unique temperature measurement technique – CCD thermoreflectance (CCD TR). This method allows for rapid thermal characterization of QCLs, as the registration of high-resolution map of the whole facet of the device lasts only several seconds. CCD-TR allows accurate evaluation of the thermal characteristics of quantum cascade lasers. Here, we report on the influence of design on thermal properties of QCLs. The design of waveguides and optical confinement in QCLs is essential. The increase of the optical confinement was frequently achieved by placing the active core between two InGaAs layers. However, low thermal conductivity of InGaAs layers results in inefficient dissipation of heat from the active core. By removing or significant reduction of the layers’ thickness, observed temperatures of the active core are significantly lower. The modifications include Experimental investigation proves that performance improvements can be gained by introducing modifications into the design of the structure. Based on experimental data, methods to further improve the performance of QCLs are discussed.

Proceedings Article | 25 July 2013 Paper

The influence of mounting and thermal strains on defects disclose during ageing test for laser diodes for 808nm and 880nm bands

E. Dąbrowska, A. Kozłowska, M. Teodorczyk, J. Zawistowska, G. Sobczak, A. Maląg

Proceedings Volume 8902, 890211 (2013) https://doi.org/10.1117/12.2030184

KEYWORDS: Diodes, Semiconductor lasers, Temperature metrology, Electroluminescence, Quantum wells, Optical mounts, Pulsed laser operation, Mirrors, Copper, Continuous wave operation

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Proceedings Article | 25 July 2013 Paper

Characterization of the optical beam emitted by high-power phase-locked arrays of diode lasers (P = 1 W CW)

Grzegorz Sobczak, Elżbieta Dąbrowska, Marian Teodorczyk, Joanna Kalbarczyk, Andrzej Maląg

Proceedings Volume 8902, 890217 (2013) https://doi.org/10.1117/12.2030182

KEYWORDS: Semiconductor lasers, Continuous wave operation, Heterojunctions, High power lasers, Diffraction, Refractive index, Diodes, Quantum wells, Electronics

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Proceedings Article | 22 January 2013 Paper

Degradation mechanism of laser diodes for 880-nm band

E. Dąbrowska, M. Nakielska, A. Kozłowska, M. Teodorczyk, K. Krzyżak, G. Sobczak, J. Kalbarczyk, A. Maląg

Proceedings Volume 8702, 87020C (2013) https://doi.org/10.1117/12.2008659

KEYWORDS: Semiconductor lasers, Diodes, Electroluminescence, Temperature metrology, Quantum wells, Heterojunctions, Thermography, Laser applications, High power lasers, Indium gallium arsenide

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Proceedings Article | 22 January 2013 Paper

Improving the beam quality of high-power laser diodes by introducing lateral periodicity into waveguides

Grzegorz Sobczak, Elżbieta Dąbrowska, Marian Teodorczyk, Joanna Kalbarczyk, Andrzej Maląg

Proceedings Volume 8702, 87020B (2013) https://doi.org/10.1117/12.2010664

KEYWORDS: Waveguides, Heterojunctions, High power lasers, Diodes, Semiconductor lasers, Active optics, Laser development, Electro optics, Manufacturing, Mirrors

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Showing 5 of 12 publications

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