Young careers at IKZ

Scientific careers

The IKZ provides high-level education with a deep understanding of scientific concepts, essential to be competitive in the academic world. On the other hand, the IKZ offers possibilities for students and young scientists to broaden their field of expertise and develop various skills to pursue alternative career paths successfully. In the following, PhD students and PostDocs introduce themselves and describe their fields of research and interests that they engage in at IKZ.

Our young scientists

Aykut Baki

Aykut studied materials science at the University of Stuttgart in cooperation with Max-Planck Institute for Solid State Research. Working for 3M Deutschland GmbH in Seefeld (Bavaria), he developed sintering processes for zirconia materials. During his Master studies at TU Berlin and HZB, he investigated oxide perovskites for energy recovery. At IKZ he is responsible for investigation of the resistive switching in MOVPE grown SrTiO3 thin films.

Section: Thin Oxide Films

LinkedIn: linkedin.com/in/aykut-baki-a3a252138/
Xing: xing.com/profile/Aykut_Baki/cv

Contact

Aykut Baki

Ph. +49 30 6392 3043

Email

Laura Bogula

After studying physics at the Humboldt-Universität zu Berlin, and an internship at Nanyang Technological University (Singapore), Laura started her PhD at IKZ at the interface between the sections "Experimental Characterization" and "Thin Oxide Films".

By using synchrotron-based three-dimensional X-ray diffraction, she investigates the real-space structure and domain pattern of strained ferroelectric (K,Na)NbO3 thin films, with a particular emphasize on thermally induced phase transitions. By applying a heating/cooling stage in the experimental setup, X-ray diffraction measurements can be performed at different temperatures, which allows monitoring of the phase transitions in situ. With great interest also in theoretical physics, she also works on numerical simulations of the X-ray diffraction data to confirm the real structural models.

LinkedIn: linkedin.com/in/laura-bogula-494777131/
Xing: xing.com/profile/Laura_Bogula/cv

Laura Bogula, Leonard von Helden, Carsten Richter, Michael Hanke, Jutta Schwarzkopf, Martin Schmidbauer
Ferroelectric phase transitions in multi-domain K0.9Na0.1NbO3 epitaxial thin films
Nano Futures 4 035005 (2020)
DOI: 10.1088/2399-1984/ab9f18

Martin Schmidbauer, Laura Bogula, Bo Wang, Michael Hanke, Leonard von Helden, Adriana Ladera, Jian-Jun Wang, Long-Qing Chen and Jutta Schwarzkopf
Temperature dependence of three-dimensional domain wall arrangement in ferroelectric K0.9Na0.1NbO3 epitaxial thin films
J. Appl. Phys. 128, 184101 (2020)
DOI: 10.1063/5.0029167

 

 

Contact

Laura Bogula

Ph. +49 30 6392 3236

Email

Elena Castellano Hernández

In the project of her Ph.D., Elena is developing new visible lasers by studying novel laser materials and their performance as gain media for solid-state lasers (SSLs). Visible lasers are highly demanded in science, industry, medicine, and daily life applications. Due to the lack of semiconductor lasers emitting in the green to orange region, SSLs are the simplest efficient and cost-efficient alternative to cover the demand of these wavelengths. Furthermore, rare-earth-doped SSLs become advantageous in terms of beam quality, robustness, handling, and potential miniaturization. Terbium active ions are outstanding candidates for laser emission at green and especially at yellow wavelengths, otherwise difficult to achieve.

Her research activities are focus on the development of terbium-based materials as potential candidates for visible laser emission. Due to the strong influence of the host lattice on the optical properties and the laser behavior of terbium ions, the study of different host materials brings the possibility of novel laser systems, capable to reach new emission wavelengths with improved efficiency and optomechanical properties. To understand terbium ions at a physical fundamental level, she carries out a systematic characterization of key terbium-doped materials. Hence, she employs several technics such as fluorescence and absorption detection at room and low temperature at wavelengths from UV to the mind-IR, time resolved characterization in nanosecond regimes, and other advanced technics such as evaluation of excited-state absorption. Furthermore, the central point of her research consists of evaluating these novel materials as laser gain media. Therefore, she has expertise in designing and developing of SSLs, as well as in laser characterization and optimization. This study has established diode-pumped terbium-lasers as the simplest and most efficient approach to achieve direct emission in the yellow range.

Section Crystalline Materials for Photonics, Center for Laser Materials

Elena Castellano-Hernández, Sascha Kalusniak, Philip W. Metz, Christian Kränkel
Diode-Pumped Laser Operation of Tb3+:LiLuF4 in the Green and Yellow Spectral Range
Laser Photon. Rev., 14 (2) 2020
DOI: 10.1002/lpor.201900229

Elena Castellano-Hernández, Philip W. Metz, Maxim Demesh, Christian Kränkel
Efficient directly emitting high-power Tb3+:LiLuF4 laser operating at 587.5 nm in the yellow range
Opt. Lett., 43 (19) 2018
DOI: 10.1364/OL.43.004791

Elena Castellano-Hernández, E. Damiano, M. Tonelli, Christian Kränkel
Laser emission of Tb3+:BaY2F8 at 581.1 nm in the yellow range
Presented at Europhoton Conference, talkWe-A3.3 (2020), Virtual

Sascha Kalusniak, Elena Castellano-Hernández, H. Tanaka, Christian Kränkel
UV-pumped visible Tb3+-lasers
Opt. Lett., 45 (22) 2020
DOI: 10.1364/OL.411072

Maxim Demesh, Alexander Mudryi, Anatoliy Pavlyuk, Elena Castellano-Hernández, Christian Kränkel, Nikolay Kuleshov
Cross sections and transition intensities of Tb3+ in KY(WO4)2
OSA Continuum, 2 (4) 2019
DOI: 10.1364/OSAC.2.001378

Contact

Elena Castellano Hernández

Ph. +49 30 6392 3054

Email

Arved Enders-Seidlitz

Arved works since July 2020 as PhD student in the NEMOCRYS project of the group Model Experiments at the IKZ. His topic is the development and validation of multiphysical computer simulations for crystal growth processes using open source software. If you are interested in his research visit his research gate website or contact him on LinkedIn.

Section Fundamental Description, Junior Research Group "Model experiments"

ResearchGate: researchgate.net/profile/Arved_Enders-Seidlitz2
LinkedIn: linkedin.com/in/arved-enders-seidlitz-465830176/

Contact

Arved Enders-Seidlitz

Ph. +49 30 6392 3129

Email

Anastasiia Kochan (Uvarova)

Anastasiia's mission is to develop gain materials for lasers with emission wavelengths in the 1 µm and 3 µm spectral range. Both are of high interest and possess a wide range of applications in materials processing, medical treatment and environmental monitoring. In particular cubic sesquioxide crystals enabled excellent laser performance when doped with Yb3+ and Er3+. However, the growth of sesquioxides is very challenging due to their high melting temperatures of more than 2400°C.

Her current activities include the development of a growth process for high quality rare-earth doped laser by the optical floating zone method (OFZ), the spectroscopic investigation of these crystals and to perform basic laser experiments.
During OFZ growth, a ceramic rod is molten by intense light and solidifies in form of a single crystal. As the molten zone is held together by surface tension, it avoids the use of expensive noble metal crucibles and insulations and enables a free choice of the growth atmosphere without restrictions imposed by crucible and insulation.
Our initial spectroscopic results reveal superior properties of OFZ crystals as compared to previous crystals grown from rhenium crucibles by the heat exchanger method (HEM) and corresponding laser experiments will be performed in the near future.

Section Crystalline Materials for Photonics, Center for Laser Materials

Xing: xing.com/profile/Anastasia_Uvarova2/
LinkedIn: linkedin.com/in/anastasia-uvarova

Contact

Anastasiia Kochan (Uvarova)

Ph. +49 30 6392 3122

Email

Palvan Seyidov

Gallium oxide (Ga2O3) is emerging as a viable candidate for certain classes of power electronics, solar blind UV photodetectors, solar cells, and sensors with capabilities beyond existing technologies due to its large bandgap. Palvan´s scientific interest include the charge and spin transport physics of device related gallium oxide (Ga2O3) bulk crystals and homoepitaxial layers. To understand the electrical properties of gallium oxide crystals grown at the IKZ, he uses conductivity and Hall effect measurements (20-1100K), deep-level transient and optical  spectroscopy (20-800K) as well as for optical characterization he uses transmission / reflection spectrometers in the wavelength range from 120nm to 100um and micro-Raman spectrometer with 6 excitation wavelengths (325-785 nm).

Section Experimental Characterization

LinkedIn: linkedin.com/in/palvan-seyidov-640708187

Contact

Palvan Seyidov

Ph. +49 30 6392 3086

Email